3M Scotchcast™ Electrical Resin 235 User guide

Scotchcast™ Electrical Resin 235
3M
Brand
3M
Model
Scotchcast™ Electrical Resin 235
Type
User guide
Tough, reliable
protection
3M
™
Scotchcast
™
OEM Resins
Interactive Product Selection Guide
3M
™
Scotchcast
™
Resins
for Original Equipment
Manufacturers
3M
™
Scotchcast
™
Electrical Liquid Resins are 100-percent-solid, thermosetting, electrical-grade insulating








2
Table of Contents
3M Scotchcast Electrical Liquid Resins .............................................................................................................................. 3
Selection Process .............................................................................................................................................................................. 3-5
Product Selection Guide ................................................................................................................................................................... 6
 ...................................................................................................................................................................... 7-12
3M Scotchcast Powder Resins .................................................................................................................................................. 13
Selection Process .................................................................................................................................................................................. 13
Product Selection Guide .......................................................................................................................................................... 14-15
 ................................................................................................................................................................. 16-17
 ............................................................................................................................... 18-19


3M
™
Scotchcast
™
Electrical Liquid Resins
•
•
•
• High adhesion
•
•


room-temperature-curing and oven-curing resins,


Resins are available to meet temperature, class,





line. Scotchcast electrical liquid resins contain no

Selection Process

succeed in an application can be selected through



• Room cure or oven cure?
• Filler?
•
•



3
Room cure or oven cure?

• The availability of ovens.



recommended.
• The application process (i.e., dipping, potting,
casting, impregnation, bonding).




have long pot lives and short cure times plus their

• The number of units to be processed.



• The mass of resin to be used per unit.



through the resin to the surrounding atmosphere
so the center does not become too hot. In larger

insulator and cause the interior temperature to rise








• Rate of cure.

temperature curing products can be oven cured.
Degree of exibility?

Are stress factors important?

stress on components.
• Will the component be subjected to thermal or


• 



• 


Filler?


• Unlled 


• Filled







• thixotropic



• paste

Temperature Class?




Class O 
Class A
Class B
Class F
Class H
Selection
Process
3M
™
Scotchcast
™
Electrical Liquid Resins
?
?
?
4

?
Is the viscosity of the resin appropriate to
the needs of the application?










Liquid Resins.
3M
™
Scotchcast
™
Electrical Liquid Resins

Does the product meet the handling,
electrical and physical property
requirements of the application?
What specications must the resin meet?






What problems have existed with other
methods or products that have been
used or evaluated?
Does the selected resin have the right
clarity or color?






• 

• 


• 


Application
Considerations
?
?


?
?
?
?
5
3M
™
Scotchcast
™
Electrical Liquid Resins
Selection Guide
Step 1:

Resin Cure Needed
Step 2:


Step 3:

Class Required
Step 4:

3M
™
Resin
Rigid
Rigid
Semiexible
Oven
Cure
Resins
Oven Cure
Unlled Resins
Lower Viscosity
Better
Impregnation
Class F
Class F
Class F
Class F
Class F
Class B
Class B
Class B
Class B
Rigid
Oven Cure
Filled Resins
Medium Viscosity
Higher Thermal
Conductivity
Better Dimensional
Stability
Oven Cure
Thixotropic
Resins
Highly Filled
Dipping, Buttering
Applications
Class F
Semiexible
Semiexible
280
281, MR283
282
250
3
251
252
235
241, 255
253
Room
Cure
Resins
Class B
Class B
Class B
Class 0
Class B
Class B
Class O
Rigid
Flexible
(re-enterable)
Room Cure
Unlled Resins
Lower Viscosity
Better
Impregnation
Room Cure
Filled Resins
Medium Viscosity
Higher Thermal
Conductivity
Better Dimensional
Stability
Room Cure
Thixotropic
Resins
Highly Filled
Troweling,
Buttering
Applications
Semiexible
Semiexible
Semiexible
Flexible
Flexible
10N, 210N
9N
226
2123
2131
8N, 208N
5N
6
3M
™
Scotchcast
™
Electrical Liquid Resins
Typical Property Data
Room Cures
Test methods
1

2

3


determine this time and add it to the cure time at temperature.
4


Polymer Cure/
Cured Form/
Filler/Color
Temperature
Class
1
3M
™
Electrical
Liquid
Resin
Product
Number Description
Mixing
Ratio
A/B
Viscosity
2
at 23°C

Cure Schedules
3
 Gel Time
4




226




naval avionics reversion requirements).











72 hrs.

6 hrs.
15 min.
at 60°C





5N














24-48 hrs.

1 hr.

hr.
18 min.
at 60°C







8N

resin. 3M resin 208 is red and supplied




permanent mechanical and thermal












24-48 hrs.

2 hrs.

1 hr.
30 min.
at 60°C

208N



Filled

9N

















24-48 hrs.

2 hrs.

1 hr.
28 min.
at 60°C






10N



















24-48 hrs.

2 hrs.

1 hr.
30 min.
at 60°C

210N
7
3M
™
Electrical
Liquid
Resin
Product
Number Hardness
5
Specic
Gravity
6
/
Density

Thermal Shock
Resistance
7


Range and Insert Size)
Linear
Thermal
Expansion
8


Tensile
Strength
9

Thermal
Conductivity
8

14
Moisture
Absorption
10, 13

Dielectric
Strength
11


Volume
Resistivity
12

at 23°C)
226
75



130°C to -55°C

insert
23 x 10
-5
68.9

2
0.20


RH
Weight gain =

 10
13
5N
15



17.7 x 10
-5
562

2
0.18
240 hours

Weight gain =

 10
14
8N
68



130°C to -55°C

insert
15 x 10
-5
120

2
0.18
240 hours

Weight gain =

 10
13
208N
9N
70



130°C to -55°C

insert
13 x 10
-5
155

2
0.31
240 hours

Weight gain =

 10
13
10N
70



130°C to -55°C

insert
8.6 x 10
-5
105

2
0.34
240 hours

Weight gain =

 10
12
210N
Test methods
5



6

7


8

9

10

11

12

13

3M
™
Scotchcast
™
Electrical Liquid Resins
Typical Property Data
Room Cures 
8


3M
™
Scotchcast
™
Electrical Liquid Resins
Typical Property Data
Room Cures 
Polymer Cure/
Cured Form/
Filler/Color
Temperature
Class
1
3M
™
Electrical
Liquid
Resin
Product
Number Description
Mixing
Ratio
A/B
Viscosity
2
at 25°C 

Cure Schedules
3

Gel Time
4






0
2123







characteristics up to 1000 Volts.








24 hrs.
62 min.




0
2131
3M Scotchcast Flame-Retardant



operating up to 1000 Volts.








24 hrs.

24-30 hrs.

16-24 hrs.
17 min.
Oven Cures – 
Polymer Cure/
Cured Form/
Filler/Color
Temperature
Class
1
3M
Electrical
Liquid
Resin
Product
Number Description
Mixing
Ratio
A/B
Viscosity
2
@25°C 

Cure Schedules
3

Gel Time
4





F
250

product are its high-temperature



strength and good electricals at high
temperatures are needed.









15-20 hrs.

6-8 hrs.

2-3 hrs.
17 min.




3





resistance.









12-16 hrs.

6-8 hrs.

1-2 hrs.
21 min.





F 280












24 hrs.

6-8 hrs.

2-3 hrs.
20 min.





235

and impact resistance, stable properties,
good electricals and adhesion are












15-20 hrs.

6-8 hrs.

2-3 hrs.
18 min.

9
Oven Cures –  
3M
Electrical
Liquid
Resin
Product
Number
Hardness
5
Specic
Gravity
6
/
Density

Thermal Shock
Resistance
7


Range and Insert Size)
Linear
Thermal
Expansion
8


Tensile
Strength
9
(psi)
Thermal
Conductivity
8

14
Moisture
Absorption
10, 13

Dielectric
Strength
11


Sample)
Volume
Resistivity
12

at 23°C)
250
25



6.5 x 10
-6
548

2
0.15
240 hours

Weight gain =

 10
15
3
80



20 x 10
-5
310

2
0.17
240 hours

Weight gain =

 10
15
280
65



130°C to -65°C

Passes
Mil-I-16923E
21 x 10
-5
310

2
0.22
240 hours

Weight gain =

 10
15
235
55



130°C to -55°C

16 x 10
-5
91

2
0.17
240 hours

Weight gain =

 10
15
3M
™
Scotchcast
™
Electrical Liquid Resins
Typical Property Data
Room Cures 
3M
™
Electrical
Liquid
Resin
Product
Number Hardness
5
Specic
Gravity
6
/
Density

Renterable and
Flame Retardant
Max
Exotherm
(3M Test
Method-67),
100 grams
Tensile
Strength
9

Thermal
Conductivity
8

14
Moisture
Absorption
10, 13

Dielectric
Strength
11


Insulation
Resistance
2123
0

 
0.75

2
24 hours
@ 23°C,
immersion
Weight gain =


4x10
11
ohms

Section 1182)
2131
82



rise
73

2
168 hours
@ 100°C,
immersion
Weight gain =


10
3M
™
Scotchcast
™
Electrical Liquid Resins
Typical Property Data
Oven Cures – Filled Resins
Polymer Cure/
Cured Form/
Filler/Color
Temp.
Class
1
3M
™
Electrical
Liquid
Resin
Product
Number Description
Mixing
Ratio
A/B
Viscosity
2
at 25°C (77°F)

Cure Schedules
3

Gel Time
4



Rigid

F
251














15-20 hrs.

6-8 hrs.

2-3 hrs.
20 min.





255















12-16 hrs.

2-3 hrs.
23 min.



Filled Cream
F 281













2- hrs.
21 min.




241













15-20 hrs.

6-8 hrs.

2-3 hrs.
22 min.


Rigid


F 252





or sagging is a requirement.









12-16 hrs.
23 min.




Cream
282














15-20 hrs.

6-8 hrs.

2-3 hrs.
23 min.





F 253




to running or sagging is a requirement.









12-16 hrs.

2-3 hrs.
23 min.
Primer
5136N







11

3M
™
Electrical
Liquid
Resin
Product
Number Hardness
5
Specic
Gravity
6
/
Density

Thermal Shock
Resistance
7



Linear
Thermal
Expansion
8


Tensile
Strength
9

Thermal
Conductivity
9

14
Moisture
Absorption
10,13

Dielectric
Strength
11


Volume
Resistivity
12

at 23°C)
251
40



Passes MIL-I-16923G

5 x 10
-5
371

2
0.33
240 hours @

Weight gain =
0.25
 10
15
255
72



130°C to -55°C

15 x 10
-5
105.5

2
0.19
240 hours @

Weight gain =

 10
15
281
65



130°C to -65°C

15 x 10
-5
147

2
0.50
240 hours @

Weight gain =

 10
15
241
65



130°C to -55°C

13.6 x 10
-5
91

2
0.33
240 hours @

Weight gain =

 10
15
252
45



Passes MIL-I-16923G

4 x 10
-5
421

2
0.29
240 hours @

Weight gain =

 10
14
282
65



130°C to -65°C

15 x 10
-5
147

2
0.50
240 hours @

Weight gain =

 10
15
253
65



130°C to -55°C

12.6 x 10
-5
91

2
0.33
240 hours @

Weight gain =

 10
15
5136N
12
3M
™
Scotchcast
™
Electrical Liquid Resins
Typical Property Data
Oven Cures – Filled Resins 


• Fluid bed dip •••
Selection Process


UL Insulation Systems







Clean the part
One or more


complete this



other contaminant.
Common methods
include media
Preheat the part


are to be coated

room temperature,



to prevent outgassing.
Forced air ovens,
induction heating,
radiant heating and
resistance heating are

used to preheat parts,
cure the resin or both.
Coat the part
• Preheated parts
When applied to preheated












application, the voltage applied



• Unheated parts
When unheated parts are coated







Cure the resin
When large, preheated parts





lose so much heat during





the chart on page 16 and on


temperature relationships
do not include the time

or reheat the part to the
curing temperature.

this determination
and start the time

temperature
is reached.
Application

Step 1 Step 2 Step 3 Step 4
3M
™
Scotchcast
™
Powder Resins
13
3M
™
Scotchcast
™

Selection Guide - What component needs to be insulated?
Motor or
transformer
iron, toroidal
core, bus
bar, etc.
Transformer
wire, exible
assembly, etc.
Wound
assembly (coil
impregnation)
Electrostatic
Fluid Bed
Electrostatic
Fluid Bed
Electrostatic
Spray
Electrostatic
Spray
Venturi
Spray (hot)
Venturi
Spray (hot)
Venturi
Spray (hot)
Fluid Bed
Dip (hot)
Fluid Bed
Dip (hot)
Fluid Bed
Dip (hot)
SC 5230N
SC 5400
SC 5400
SC 5555
SC 5555
SC 265
SC 263
SC 260
260CG
260CG
SC 262
Step 1:

to be coated
Step 2:

application method
Step 3:
Select the 3M
™


14
3M
™
Scotchcast
™

Selection Guide - What component needs to be insulated? 
What is it that needs
electrically insulated?
• Motor stator or
armature core?






How large or small is the component?
Are there complex, hard-to-reach
areas that need to be insulated?
Will intricate masking be needed?






Fluid Bed Dip – Components are




Venturi Spray – Components are




Electrostatic Spray
using an electrostatic application gun.




particles adhere to grounded components.



components.
Electrostatic Fluid Bed 





adhere to grounded components. Parts

coated using this method.
Step 1:

to be coated
Step 2:

application method
Step 3:
Select the 3M
™


What temperature will the coating
be subject to?
Is UL Recognition of importance?
What dielectric strength is needed?
What heating methods are
available to cure the powder
coating?

that should be addressed prior to




• 




• 

steel, aluminum and copper.
• 


into consideration.
• 
substrate cleanliness is

• 
impact on coating adhesion

15
3M
™
Scotchcast
™

Typical Property Data
3M
™
Powder
Resin
Product
Number
Temp.
Class
1
Description
UL System
1446 Approved
File Number
E163090
UL 746B
Comp.
Cure Schedules
(Temp/Time)
260
H


3M
™
Scotchcast
™
Resin 260CG is a course-ground






E35075




260CG
262










263 H


high-temperature cut-through resistance is required.



E35075




265 H



a solvent.





helical coil and


MW 35 magnet

E309208
E309208




5230N H

electrostatic charging capabilities It provides


Recognized method.


E35075



5400 F










5555 10G
H
Resin 5555 can be applied via cold electrostatic




other metal components needing electrical insulation.





E35075
5555 10G:



5555 22G
5555 22G:




Test methods
1

16
3M
™
Scotchcast
™

Typical Property Data 
3M
™
Powder
Resin
Product
Number
Specic
Gravity
Cut-
Through
Resistance
Edge
Coverage
(%)
Impact Resistance
(inch-lbs.
Newton Meters)
Gel Time
@ 193°C
Hot Plate
Dielectric Strength
(volts/mil)
Volume
Resistivity
(Ohm-Cm
at 23°C) Color
260
1.43
215°C


100 inch-lbs

12-16 sec.
@ 380°F



12-15 mil


10
15
Green
260CG
262 1.34
130°C


100 inch-lbs

12-16 sec.
@ 380°F



12-15- mil


10
13
Red
263 1.47
290°C


100 inch-lbs

8-14 sec.
@ 380°F



12-15 mil


10
15
Green
265 1.16  
160 inch-lbs

60 sec.
@ 380°F



12-15 mil


10
14
Clear
5230N 1.60
320°C


160 inch-lbs

9-16 sec.
@ 380°F



12-15 mil


10
15

5400 1.22
292°C

 
15-25 sec.
@ 400°F





10
14


5555 10G
1.7
340°C

5555 10G:

100 inch-lbs

5555 10G:
9-11 sec.
@ 392°F



12-15 mil


10
14
Green
5555 22G
5555 22G:

5555 22G:
21-23 sec.
@ 392°F

17


engineered to meet rigorous applications

Other
Insulating Solutions
from 3M
18
Flexible Insulation



including use as high-temperature electrical insulation




high operating temperatures.
Heat Shrink Tubing
and Molded Shapes









Insulating Tapes






insulating products.
19
3M
™
Scotchcast
™
OEM Resins
Other Insulating Solutions from 3M 

Important Notice





Warranty; Limited Remedy; Limited Liability.


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FOR A PARTICULAR PURPOSE. 





Electrical Markets Division


800-676-8381


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3M Scotchcast™ Electrical Resin 235 User guide

Scotchcast™ Electrical Resin 235
3M
Brand
3M
Model
Scotchcast™ Electrical Resin 235
Type
User guide
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