Which abrasive fits which machine?

Each machine has its own size: belt length and width, delta triangle size, pencil sleeve diameter. The product name and the spec table name the machine.

What is a flexible abrasive for?

A flexible backing lets the abrasive follow a profiled or concave surface. A rigid sheet touches only the high points; a flexible one contacts the whole shape.

The number is the mesh the grain passes: the higher the number, the smaller the grain and the finer the surface. 80 is coarse, 240 medium, 1000 and above is preparation for polishing.

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Micro Abrasives

Micro abrasives are the small-scale consumables that fit micro tools and micro sanders: pencil sanding sleeves, micro sanding belts, flexible discs and machine-specific corundum sheets. Chosen by grit and by machine size.

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Do not skip a grit

Sanding is not removal so much as replacing one scratch with a finer one; what is left at the end is the scratch of the last grit used.

Skipping therefore spoils the result. Going straight from 80 to 400, the fine grain never reaches the bottom of the deep scratch and only polishes its edges; the surface feels smooth but the scratch reappears under paint or lacquer.

The abrasive follows the material

Corundum (aluminium oxide) is the general purpose grain: it works well on wood, paint and soft metal. Silicon carbide is sharper and more friable, and is the choice on glass, ceramic, stone and hard coatings.

Zirconia alumina is for steel: the grain fractures to expose fresh cutting edges, so it lasts. The product name says which is used.

Frequently Asked Questions

Which abrasive fits which machine?
Each machine has its own size: belt length and width, delta triangle size, pencil sleeve diameter. The product name and the spec table name the machine.
What is a flexible abrasive for?
A flexible backing lets the abrasive follow a profiled or concave surface. A rigid sheet touches only the high points; a flexible one contacts the whole shape.
How is grit read?
The number is the mesh the grain passes: the higher the number, the smaller the grain and the finer the surface. 80 is coarse, 240 medium, 1000 and above is preparation for polishing.