Appearance Limit Standards

The standards for appearance defects differ based on the size of the magnets. For products where appearance is crucial or mechanical strength is important, specific limit standards are established and included in the product specifications. Additionally, due to their physical properties, magnets are considered breakable items, similar to ceramics and glass, making them prone to chips and dents. While it is impossible to completely eliminate these imperfections, they are generally acceptable unless there are large chips that affect the magnetic properties or if the surface treatment peels off, which could lead to corrosion.

item	figure	size	A mm	B mm	C mm	Permissible # of Defects	remarks	Passed	defective
Surface Chipping		φ5	≦1.0	≦1.0	≦0.5	≦1 piece	Surface treatment must be applied to the chipped area.
		φ10	≦2.0	≦2.0	≦1.0	≦1 piece
		φ20	≦2.0	≦2.0	≦1.0	≦1 piece
		φ30	≦2.5	≦2.5	≦2.0	≦1 piece
		φ40	≦2.5	≦2.5	≦2.0	≦1 piece
		φ50	≦3.0	≦3.0	≦2.5	≦1 piece
Side Chipping		φ5	≦1.0	≦1.0	≦0.5	≦2 pieces	Surface treatment must be applied to the chipped area.
		φ10	≦2.0	≦2.0	≦1.0	≦2 pieces
		φ20	≦2.0	≦2.0	≦1.0	≦2 pieces
		φ30	≦2.5	≦2.5	≦2.0	≦2 pieces
		φ40	≦2.5	≦2.5	≦2.0	≦2 pieces
		φ50	≦3.0	≦3.0	≦2.5	≦2 pieces
Pinhole		all	≦0.5	-	-	≦2 pieces	Surface treatment must be applied to the pinhole area.
Scratches and streaks			Scratches that can be caught with a fingernail are not allowed.				Surface treatment must be applied to areas with scratches and streaks.
crack			All not allowed				Determining whether it is a crack or a streak
Discoloration							No discoloration due to rust, no blistering or peeling of paint