Sizing

Products, Technical InformationComments are off for this post.

You Are Here:, Technical InformationSizing

GRIT AND POWDER SIZING – DESCRIPTION

Download and Print PDF Version

Domestic abrasive manufacturers use sieves or screens to size abrasive grain. Both the sieve and the grain size must conform to the American National Standards Institute B74.12. Typical abrasive grain designations such as #8, #16, #36, #60, #120, #180, and #240 would conform to the same size standard regardless from which domestic manufacturer it was purchased. These sizes are referred to as macrogrits.

There is no standard process for sizing abrasive powders. Typically, abrasive powders are water classified, but some manufacturers may use an air classification technique. After a material has been graded to a specific size, there are several different methods that can be used to perform particle size analysis. Consequently, particle size may vary on a given size from one manufacturer to another.

Although sieve size designations such as #280, #320, #400, #500, #600…may be used to identify abrasive powders, they are theoretical screen size numbers because screens are not actually used to classify the material. In this case, as the screen size number gets higher, the size of the material is finer. Abrasive powders commonly refer to any size finer than #240 grit, and are called microgrits. Each mesh size has an equivalent micron size designation, i.e. 37, 29, 17, 13, 9, 5, 7, 3. As the micron size number gets lower, the size of the material is finer.

GRIT AND POWDER SIZING – TABLE OF GRIT SIZES

GRIT SIZING FOR

ALUMINUM OXIDES
AND
SILICON CARBIDES

Grit / Sieve SizeInches / mm
(avg.)
Microns
(avg.)
120.063 / 1.6001600
160.043 / 1.0921092
200.037 / 0.939940
240.027 / 0.685686
300.022 / 0.558559
360.019 / 0.482483
460.014 / 0.355356
540.012 / 0.304305
600.010 / 0.254254
700.008 / 0.203203
800.0065 / 0.165165
900.0057 / 0.144145
1000.0048 / 0.121122
1200.0040 / 0.101102
1500.0035 / 0.08889
1800.0030 / 0.07676
2200.0025 / 0.06363
2400.0020 / 0.05050

 

GRIT AND POWDER SIZING – TABLE OF POWDER SIZES

SIZING FOR

ALUMINUM OXIDES
AND
SILICON CARBIDES

IN MICRONS (um)
(Based on the FEPA standard)

Powder SizeMicrons (Avg.)
28037
32029
36023
40017
50013
6009
8007
10005
12003
Top