F-3 Density and Thickness
S.A.E. Specification Number F-3
A.S.T.M. Federal and Felt Association Type and Grade Number 16R3
Density Percent Specific Gravity 33.3
Actual (1) Wool Content (Min.) Percent 85
Carbon Tetrachloride Soluble (Max.) Percent 2.5
Water Soluble (Max.) Percent 3.0
Carbon Tetrachloride & Water Soluble (Max.) Percent 4.5
Ash (Max.) Percent 2.5
Tensile Strength (Min.) PSI 400
Splitting Resistance (Min.) Lbs. Per 2" Width 22
Trade Designation Back Check
Color Gray
Standard Width Inches 60
THICKNESS WEIGHT
Nominal (inch) Limits (inch) Nominal (lbs/sq. yd.) Limits (lbs/sq. yd.)
1/8 0.113 - 0.137 1.95 1.80 - 2.10
3/16 0.175 - 0.201 2.93 2.71 - 3.15
1/4 0.236 - 0.264 3.90 3.61 - 4.19
5/16 0.298 - 0.328 4.87 4.50 - 5.24
3/8 0.359 - 0.391 5.85 5.41 - 6.29
1/2 0.481 - 0.519 7.80 7.21 - 8.39
5/8 0.603 - 0.647 9.75 9.01 - 10.49
3/4 0.725 - 0.775 11.70 10.81 - 12.59
7/8 0.847 - 0.903 13.65 12.61 - 14.69
1 0.969 - 1.031 15.60 14.41 - 16.79