F-2 Density and Thickness
S.A.E. Specification Number F-2
A.S.T.M. Federal and Felt Association Type and Grade Number 16R2
Density Percent Specific Gravity 34.2
Actual (1) Wool Content (Min.) Percent 90
Carbon Tetrachloride Soluble (Max.) Percent 2.5
Water Soluble (Max.) Percent 2.5
Carbon Tetrachloride & Water Soluble (Max.) Percent 4.0
Ash (Max.) Percent 2.0
Tensile Strength (Min.) PSI 500
Splitting Resistance (Min.) Lbs. Per 2" Width 28
Trade Designation Back Check
Color Any color except 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 2.0  1.90 - 2.10 
3/16 0.175 - 0.201 3.0 2.85 - 3.15
1/4 0.236 - 0.264 4.0 3.80 - 4.20
5/16 0.298 - 0.328 5.0 4.75 - 5.25
3/8 0.359 - 0.391 6.0 5.70 - 6.30
1/2 0.481 - 0.519 8.0 7.60 - 8.40
5/8 0.603 - 0.647 10.0 9.50 - 10.50
3/4 0.725 - 0.775 12.0 11.40 - 12.60
7/8 0.847 - 0.903 14.0 13.30 - 14.70
1 0.969 - 1.031 16.0 15.20 - 16.80