Everything you need to know about Sanding!
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are sandpapers graded?
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.
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
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).
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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