TT-B-13250
3.2 Physical properties.
3.2.1 Appearance. When tested as specified in 4.3.1, the beads shall be transparent, clean, dry, free-flowing, and free from bubbles and foreign matter.
3.2.2 Roundness. When tested as specified in 4.3.2, Type I and Type III beads shall contain not less than 80 percent by weight of true spheres. The Type IV beads shall contain not less than 85 percent by weight of true spheres.
3.2.3 Index of refraction. When tested as specified in 4.3.3, the index of refraction shall be as follows: For Type I and Type IV beads 1.50 to 1.55; for Type III beads 1.90 to 1.93.
3.2.4 Specific gravity. When tested as specified in 4.3.4, the specific gravity shall be as follows: For Type I and Type IV beads 2.30 to 2.50; for Type III beads 4.00 to
4.50.1
3.2.5 Gradation. When tested as specified in 4.3.5, the beads shall pass each sieve series, as specified in Table I.
Table I. Gradation, percent by weight, passing.
Type I |
Type III |
Type IV |
|||||||||
U.S. Sieve # |
Microns |
A |
B |
A |
B |
||||||
Min |
Max |
Min |
Max |
Min |
Max |
Min |
Max |
Min |
Max |
||
12 |
1700 |
--- |
--- |
--- |
--- |
--- |
--- |
100 |
--- |
100 |
--- |
14 |
1400 |
--- |
--- |
--- |
--- |
--- |
--- |
95 |
100 |
--- |
--- |
16 |
1180 |
--- |
--- |
--- |
--- |
100 |
--- |
80 |
95 |
95 |
100 |
18 |
1000 |
--- |
--- |
--- |
--- |
--- |
--- |
10 |
40 |
--- |
--- |
20 |
850 |
100 |
--- |
--- |
--- |
95 |
100 |
0 |
5 |
35 |
70 |
30 |
600 |
80 |
100 |
--- |
--- |
55 |
75 |
--- |
--- |
0 |
5 |
40 |
425 |
--- |
--- |
--- |
--- |
15 |
35 |
--- |
--- |
--- |
--- |
50 |
300 |
18 |
35 |
--- |
--- |
0 |
5 |
--- |
--- |
--- |
--- |
70 |
212 |
--- |
--- |
100 |
--- |
--- |
--- |
--- |
--- |
--- |
--- |
80 |
180 |
--- |
--- |
85 |
100 |
--- |
--- |
--- |
--- |
--- |
--- |
100 |
150 |
0 |
10 |
--- |
--- |
--- |
--- |
--- |
--- |
--- |
--- |
140 |
106 |
--- |
--- |
15 |
55 |
--- |
--- |
--- |
--- |
--- |
--- |
200 |
75 |
0 |
2 |
--- |
--- |
--- |
--- |
--- |
--- |
--- |
--- |
230 |
63 |
--- |
--- |
0 |
10 |
--- |
--- |
--- |
--- |
--- |
--- |
1 For field verification, the mass of Type I and Type IV beads should be 1570 grams per liter and Type III should be 2670 grams per liter.
Source: https://assist.dla.mil -- Downloaded: Check the source to verify that thi3s is the current version before use.
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