Johnson & Allen NEOASTRA DG User manual

Brand
Johnson & Allen
Model
NEOASTRA DG
Type
User manual

Johnson & Allen NEOASTRA DG is a high-grade fluorescent magnetic ink designed to be used in the Magnetic Particle Inspection process. It is hydrocarbon-based and has a high flash point, making it safe for use in a variety of applications. The ink has good particle mobility, using the highest grade of particles, selected for their response to very low magnetic field strengths and also low coercivity. This makes the ink responsive whilst avoiding coagulation. The carrier is a highly refined and de-aromatized hydrocarbon.

Johnson & Allen NEOASTRA DG is a high-grade fluorescent magnetic ink designed to be used in the Magnetic Particle Inspection process. It is hydrocarbon-based and has a high flash point, making it safe for use in a variety of applications. The ink has good particle mobility, using the highest grade of particles, selected for their response to very low magnetic field strengths and also low coercivity. This makes the ink responsive whilst avoiding coagulation. The carrier is a highly refined and de-aromatized hydrocarbon.

Product Data
NEOASTRA DG
Johnson and Allen Ltd, Neocol Works, Smithfield, Sheffield, S3 7AR.
Tel +44 (0)114 2738066 Fax +44 (0)114 2729842.
e-mail info@johnsonandallen.co.uk
www.johnsonandallen.co.uk
Magnetic Particle Inspection – Fluorescent Magnetic Ink (Ultra Bright)
NeoAstra DG is a high grade Fluorescent Magnetic Ink which fluoresces bright green under UV black light (wavelength
365 nm) for use in the Magnetic Particle Inspection Process. The product is hydrocarbon based, has a high flash point
and has with good particle mobility using the highest grade of particles, selected for their response to very low magnetic
field strengths and also low coercivity. This makes the Ink responsive whilst avoiding coagulation. The carrier is a highly
refined and de-aromatised hydrocarbon. This inspection ink which should be viewed using UV light with a surface
intensity of at least 1,000 μW/cm2 with the benefit of allowing moderate ambient light. Anecdotally it has been
demonstrated that defects can be found with up to 200 Lux of ambient light, with the product only fluorescing more
under greater irradiance. However, to comply with BS EN 9934 ambient levels must be restricted to 20 Lux.
Typical Properties (not a specification)
Colour under White Light Green
Colour under Black Light Yellow-Green fluorescence
Mean Particle Size 10 Microns
Flash Point > 100 °C (Carrier fluids with Flash Point’s below 100 °C are not recommended for MPI use)
Solid Content 0.05 – 0.15% Typical by volume after 60 minutes (50:1 dilution)
Method of Use
Aerosol application or bulk can also be supplied for use in Bench Unit Ink Hoppers etc
Prior to application, aerosol and bulk 5 litre containers must be shaken vigorously to disperse the Particles.
Johnson and Allen recommend the use of a graduated ASTM 100ml pear shaped centrifuge tube to verify solid content.
NeoAstra DG is flooded over the surface to be inspected whilst the area is magnetised in a particular orientation. The
magnetic field must be held on until ink application has finished avoiding washing off the indications. Defects will show
up as well defined indications and inspection should be undertaken in good UV lighting conditions. (over 1000 µW/cm²
at 365nm peak) Past experience has shown that up to 200 Lux white light is still suitable for most inspections.
NeoAstra DG provides a high level of integrity when used on welded fabrications, pressure vessels, structures, pipes,
castings, forgings and many other ferromagnetic components.
Specification Compliance
NeoAstra DG Complies with BS EN ISO 9934-2:2002, and other Industrial standards. Pack size: Aerosol, 5L and 25 Litre.
COSHH - Please read the relevant SDS for this product.
Alternative Products (hydrocarbon based Magnetic Inks)
NeoAstra DGC - Fluorescent - concentrate
NeoAstra F - Fluorescent - ready mixed
NeoAstra FC - Fluorescent - concentrate
Neocol B - Black - ready mixed
Neocol BC - Black - concentrate
An ISO 9001 Registered Company – FM 09387 Applies. Member of the British Institute of Non Destructive Testing
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Johnson & Allen NEOASTRA DG User manual

Brand
Johnson & Allen
Model
NEOASTRA DG
Type
User manual

Johnson & Allen NEOASTRA DG is a high-grade fluorescent magnetic ink designed to be used in the Magnetic Particle Inspection process. It is hydrocarbon-based and has a high flash point, making it safe for use in a variety of applications. The ink has good particle mobility, using the highest grade of particles, selected for their response to very low magnetic field strengths and also low coercivity. This makes the ink responsive whilst avoiding coagulation. The carrier is a highly refined and de-aromatized hydrocarbon.

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