F-13 Density and Thickness S.A.E. Specification Number F-13 A.S.T.M. Federal and Felt Association Type and Grade Number 9R4 Density Percent Specific Gravity 18.1 Actual (1) Wool Content (Min.) Percent 75 Carbon Tetrachloride Soluble (Max.) Percent 4.0 Water Soluble (Max.) Percent 4.0 Carbon Tetrachloride & Water Soluble (Max.) Percent 8.0 Ash (Max.) Percent 3.5 Tensile Strength (Min.) PSI 75 Splitting Resistance (Min.) Lbs. Per 2" Width 2 Trade Designation Firm Pad Color Gray Standard Width Inches 72

THICKNESS WEIGHT Nominal (inch) Limits (inch) Nominal (lbs/sq. yd.) Limits (lbs/sq. yd.) 1/8 0.105 - 0.145 1.06 0.98 - 1.14 3/16 0.165 - 0.211 1.59 1.47 - 1.71 1/4 0.224 - 0.276 2.12 1.96 - 2.28 5/16 0.284 - 0.342 2.65 2.45 - 2.85 3/8 0.343 - 0.407 3.18 2.94 - 3.42 1/2 0.462 - 0.538 4.24 3.92 - 4.56 5/8 0.581 - 0.669 5.30 4.90 - 5.70 3/4 0.700 - 0.800 6.36 5.88 - 6.84 7/8 0.819 - 0.931 7.42 6.86 - 7.98 1 0.938 - 1.062 8.48 7.84 - 9.12