Magnetic Particle Spray | McMaster-Carr

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4 Products

Magnetic Particles for Flaw Detection

Sprays


Black	Fluorescent Light Green

Reveal imperfections both at and slightly below the surface of your metal part, unlike other flaw detection methods. Use these particles with a magnetic yoke to check for faulty seams, welding defects, and fatigue cracks to make sure metal parts will be safe under high stress. The yoke creates a magnetic field that draws the particles towards flaws, making them easy to spot. To prevent issues with other inspections down the line, make sure to fully demagnetize your part to remove all the particles.

Sprays—When testing round or hard-to-reach material, it’s easier to apply an even layer of spray particles than powder. They’re smaller than powder particles, so they’re good for detecting finer surface flaws and imperfections.

Water-Based Spray—Water-based spray particles are easier to clean up than oil-based spray particles.

Ultraviolet—Ultraviolet spray particles require a UV light, but stand out more than natural light particles, so you spend less time examining each part. For the best contrast, use these particles in dim lighting.

Black—Black spray particles are often used with white contrast paint to make flaws more visible.

360° Sprayer—Particles with a 360° sprayer won’t sputter or spatter even when the aerosol can is upside down, so you can coat parts evenly without straining your wrist.

				Container			Application Temp. Range, ° F
	For Use On	Visibility	Color	Net Wt., oz.	Type	Particle Size, μm	Min.	Max.	Features	Specs. Met	Mil. Spec.		Each
Oil-Based Spray



		Cobalt, Iron, Nickel, Stainless Steel, Steel	Natural Light	Black	10.5	Aerosol Can	2	45	120	360° Sprayer	ASTM E1444, ISO 9934	MIL-STD-2132, NAVSEA 250-1500-1, NAVSEA T9074-AS-GIB-010/271	00000000	000000


		Cobalt, Iron, Nickel, Stainless Steel, Steel	Ultraviolet	Fluorescent Light Green	10.5	Aerosol Can	6	55	120	—	ASTM E1444, ISO 9934	MIL-STD-2132, MIL-STD-271, NAVSEA 250-1500-1, NAVSEA T9074-AS-GIB-010/271	0000000	00000


		Water-Based Spray



				Cobalt, Iron, Nickel, Stainless Steel, Steel	Natural Light	Black	12.2	Aerosol Can	2	25	120	—	ISO 9934	MIL-STD-2132, NAVSEA 250-1500-1, NAVSEA T9074-AS-GIB-010/271	00000000	00000

Contrast Paint for Magnetic-Particle Flaw Detection

Create a high-contrast background for magnetic particles to make flaws easier to spot during inspections. This opaque white paint reduces glare, so you can see where particles are clustered around imperfections. No need for brushes—it comes in an aerosol can that’s easy to use during field testing and spot inspections. Even when the can is upside down, the 360° sprayer won’t sputter or spatter, so you can coat parts evenly without straining your wrist. To speed up inspections, this paint dries quickly, leaving a clean coat that won’t bubble or flake. It works with both wet and dry magnetic particles.

	Container
	Net Wt., oz.	Type	Solution Type	Overall Dry Time, min.	Application Temp. Range, ° F	For Use On	Color	Features		Each
Spray



		12	Aerosol Can	Solvent Based	1	45 to 120	Cast Iron, Cobalt, Nickel, Steel, Stainless Steel, Iron	White	360° Sprayer	0000000	000000