Neoastra DG Fluorescent Magnetic Ink

Neoastra DG Fluorescent Magnetic Ink quantity

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Description

Product Information

Johnson and Allen Neoastra DG Fluorescent Magnetic Ink – Day Glow

Neoastra DG is a fluorescent magnetic ink for use in MPI and was formulated to give defined indications using the highest grade of magnetic particles which were selected for their response to very low magnetic fields and for low coercivity. Neoastra DG is ideal for the inspection of welds, pressure vessels, structures, pipes, castings, forgings and most other ferromagnetic components.

Neoastra DG should be viewed using a UV light with a surface intensity exceeding 1000 μW/cm2 with the benefit of allowing moderate ambient light. Anecdotally it has been demonstrated that defects can be found with up to 500 Lux of ambient light present. However, to comply with BS EN 9934-2:2015 levels must be restricted to 20 Lux.

Features

• Ready-to-use
• Clear, bright indications under UV light
• Low maintenance, oil-based suspension
• High sensitivity
• Excellent fluorescent contrast for quick identification
• Excellent particle mobility
• Good dispersion stability
• Protects parts and equipment against corrosion
• Great concentration consistency
• Superior surface wetting
• Even surface coverage for better detection

Specification Compliance

• ASTM E709
• ASTM E1444/E1444M
• EN ISO 9934-2

Applications

Defect location: surface and slightly subsurface

Ideal for:

• Detecting very fine to fine discontinuities
• Critical applications
• After secondary processing
• In-service inspections
• High strength alloys

Defect examples:

• Inclusions
• Seams
• Shrink cracks
• Tears
• Laps
• Flakes
• Welding defects
• Grinding cracks
• Quenching cracks
• Fatigue cracks

Instructions for use

Clean the component before testing to reduce the risk of contamination and provide a suitable test surface.

Mix the ink thoroughly and keep it agitated during testing.

Apply the ink by spraying, flooding or immersion, depending on your chosen method (see below):

Wet continuous method
Apply the ink to all surfaces of the component and apply a magnetising current. Remember to stop the flow of ink before the current is switched off, otherwise there is a risk that the force of the ink flood may wash away indications.

Wet residual method
This method is generally less sensitive than the continuous method and is more susceptible to rapid particle depletion and bath contamination.

• Pre-magnetise the part to be tested.
• Immerse the part in a bath of the ink.
• Remove it and allow it to drain.
• Inspect the part.

During use, the magnetic content of any ink bath will become depleted, so you will need to check your bath strength at least once each day. The most widely-used way of checking an ink’s settlement volume is by using a graduated ASTM pear-shaped centrifuge tube.

When the settlement volume approaches the lower limit (0.15 ml), check the bath. If the bath appears contaminated, or if it has been in use for a long time, replace the contents.

After inspection, remember to completely de-magnetise your component before cleaning, to ensure easy removal of any residual powder particles.

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Additional information

Manufacturer	Johnson and Allen