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EVERYTHING ABOUT SANDING
Intro
Where do you begin?
How are sandpapers graded?
Cloth or paper backing?
Open or closed coat?
Hand or power sanding?
Which power sander is best?
Important sanding tips

Tip #5
Everything you need to know about Sanding!
(continued)
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How are sandpapers graded?

There are three ways of grading abrasive papers: by name, such as coarse, medium fine, etc. - by grit numbers, such as 60, 80, 100, etc. - and by “aughts”, such as 1/0, 4/0, 7/0, etc. The latter of these is not a common.

Although the names (coarse, etc.) are the easiest to understand, the ways manufacturers use these terms vary so much that they can be confusing. One manufacturer may call a 320-grit paper “very fine” while another may call it “extra fine”.

Usually, papers will carry both a name and a grit number. Grit numbers range from 12 (extra-coarse) to 600 (extra-fine), while “aught” designations range from 4-1/2 (extra coarse) to 10/0 (extra-fine).

Grit numbers and “aught” designations are assigned by sifting abrasive particles through progressively smaller sieves, with the number of openings per linear inch determining the grit number. For example, 80-grit abrasive particles are selected with sieves having 80 openings per linear inch.

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