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COMPACT GRAIN
Grit Range
80 - 800


Coating
Closed coat
Grinding Aid
Size coat w/ active filler

Backing
Y-Wt. or J-Wt.

Belt Size
up to 52 wide
PSA Disc Size
5 and 6 common.


Larger sizes available
COMPACT
GRAIN
LOW CUT RATE
Fine Finish
Surface Finishing
and Polishing
Deburring and
Flash Removal
Weld/Heavy
Stock Removal
HIGH CUT RATE
Coarse Finish
COMPACT GRAIN
Arc Abrasives, Inc. // 85 Marybill Drive Troy OH USA 45373 // phone 1.800.888.4885 fax 1.800.888.4969 // www.arcabrasives.com
©2008 Arc Abrasives, Inc.
What makes compact grain different?
Compact grains are much different than conventional
coated abrasives. Compact grains are a cluster, or
agglomerate of multiple abrasive grains of the same
size. Simply stated, the grains have multiple layers of the
same grit - compared to only one layer of a conventional
coated abrasive product. As one layer of abrasive grain
is worn away, another layer is exposed. The compact
grain construction results in less loading, much longer life
and a very consistent finish.
Convert conventional coated abrasives to the same
compact grain grit size. Compact grains will appear to
be much coarser than their conventional abrasive
equivalent. Rest assured, the grain contained in the
cluster is no coarser than the grit stated on the backing.
Where Compact Grains can be Effective
Due to their unique construction, compact grains have very specific application advantages over conventional coated abrasives.
Metallic Surface Finishing
Compact grains are ideal for fine belt finishing. Some applications include stroke sanding, or wide belts machines used to finish stainless, mild steel or
high alloy material. It is common to see a 15-to-1 life increase over conventional coated abrasives in these applications.

Compact grains show a huge performance increase when used as a PSA Disc to remove mill scale and weld penetration marks on mild or stainless
steel. Typical coated abrasives load rapidly, which contributes to poor overall performance. Compact grains resists loading due to their construction
and will last an average of 15 to 20 times longer.
Deburring and Flash Removal
Compact grains also work very well on wide belt deburring applications, in which conventional coated abrasives are used. Using finer grits to remove
burrs from stamped, punched, sheared or cut mild and stainless steel parts is an ideal application for compact grains. It is common to see 15 to 20
times the life compared to other coated abrasives.
Metals
It is recommended to use compact grains on any mild, stainless or high alloy steel. However, due to the construction, compact grains do not break down
well on soft metals. Refrain from using compact grain products on aluminum or other non-ferrous metals.
Conventional Aluminum Oxide
Compact Grain
Grinding Time
Stoc
k R
emov
al
Performance Results
Conventional Aluminum Oxide
(red)
Test performed under controlled laboratory conditions with 320 grit material.
Compact Grain
(blue)

x
15x
Compact grains last 15 - 20 times longer!