Meshes, Sieves, and Screens Table 2. Standard Sieves and Mesh Sizes Table 2. (Continued) Standard Sieves and Mesh Sizes Machinery's Handbook, 31st Edition
1072
ASTM E-11 No.
BS 410 Mesh
DIN 4188 mm 0.08 0.09 0.1
ASTM E-11 No.
BS 410 Mesh
DIN 4188 mm 0.5 0.56
Mesh Size µ m
Mesh Size µ m
TYLER Mesh
TYLER Mesh
75 80 90
200
200
200
… 500
32
35
30
… … …
560 600
… … …
170
170
170
28
30
25
…
100
… … …
… … … … …
Table 3. Typical Openings in Laboratory Sieve Series
Sieve size (mm)
Tyler (approx)
US (approx)
Sieve size (mm)
Tyler (approx)
US (approx)
BSS
BSS
4.75 3.35 2.81 2.38 1.68 1.4 1.2 2
- 5 6 7 8
4 6 7 8 9
4 6 7 8
0.354 0.297 0.251 0.211 0.178 0.152 0.125 0.104 0.089 0.075 0.066 0.053 0.044 0.037
44 52 60 72
42 48 60 65
45 50 60 70
10 12 14 16 18 20 25 30 35 40
85 100 120 150 170 200 240 300 350 440
80 100 115 150 170 200 250 270 325 400
80 100 120 140 170 200 230 270 325 400
10 12 14 16 18 22 25 30 36
10 12 14 16 20 24 28 32 35
1
0.853 0.71 0.599
0.5
0.422
BS 812-103.1:1985 Withdrawn replaced by BS EN 933-1:2011. BS EN 933-1:2011 describes two methods for the determination of the particle size distribution of samples of aggregates and fillers by sieving. Abrasive Grit Number.— Standard abrasive grain sizes are designated by numbers. These numbers range from number 8, which is the coarsest, to number 240, which is the finest. The allowable limits for the sizing of aluminum-oxide and silicon-carbide abrasives for grinding wheel manufacture are given in US Simplified Practice Rec- ommendation 118. These numbers in most cases equal approximately the number of sieve openings per inch in the United States Standard Fine Sieve series. For example, a number 30 sieve has 0.0232-inch openings and a sieve wire diameter of 0.0130 inch, mak- ing the pitch equal to 0.0362 inch; hence there are 27.6 meshes per inch. The United States Standard Fine Sieve series ranges from number 3 1 ⁄ 2 to number 400. Grading Abrasives: In the actual grading of abrasives, several standard sieves are used. To illustrate, take grit No. 10. All material must pass through the coarsest sieve—in this case the No. 7. Through the next to the coarsest sieve, termed the “control sieve”—in this case the No. 8—all material may pass, but not more than 15 percent may be retained on it. At least 45 percent must pass through No. 8, and be retained on No. 10 sieve, but it is per missible to have 100 percent pass through No. 8, and remain on No. 10 sieve, the require ment being that the grain passing through No. 8, and retained on No. 10 and No. 12 must add to at least 80 percent; consequently, if 45 percent passed through No. 8 sieve and was retained on No. 10 sieve, then at least 35 percent must be retained on the No. 12 sieve. Not more than 3 percent is permitted to pass through the No. 14 sieve.
Copyright 2020, Industrial Press, Inc.
ebooks.industrialpress.com
Made with FlippingBook - Share PDF online