Diamond Superabrasive Block 6200J 3M™

The 3M 6200J block is a diamond abrasive block for hand sanding very hard materials. Diamond, the hardest mineral there is, cuts materials on which a conventional abrasive slides without cutting.

Specifications

• Mineral: diamond.
• Grades: N250, N74 and N40.
• Colour coding: green (N250), red (N74), yellow (N40).
• Use: manual sanding and finishing.

For which materials

Tungsten carbide, technical ceramics, glass, stone, hardened steels, hard coatings. On these materials, an aluminium oxide grain wears faster than the part: it dulls in a few passes. Diamond stays sharp.

The block is also used for sharpening and dressing tools: carbide tool edges, blades, cutting tools.

Colour coding

Each grade has its own colour, which avoids mixing up blocks in the workshop. The number refers to grain size: the higher it is, the coarser the grain and the faster the cut: N250 to remove material, N74 to refine, N40 for finishing.

Use

Preferably work with water: it flushes away particles, cools the surface and keeps the block from clogging. Let the diamond cut with moderate pressure: pressing hard does not speed up the work and wears the block faster.

Rinse the block after use to clear residue. A well-maintained diamond block lasts a long time, which offsets its price on materials where a conventional abrasive would be used up in minutes.

See also our diamond abrasive blocks, our abrasive sponges and our 3M products.