1.1 This specification covers all standard types of felt in the form of rolls and sheets that are suitable for mechanical use. Certain special-purpose felts are also covered.
1.2 This specification is not applicable to felt-like products that utilize weaving, knitting, stitching, or bonding such as papermaker's felt.
1.3 Trade practice in the felt industry deals in pounds, yards, and inches, therefore the values stated in inch-pound units are to be regarded as standard. The values in SI units are provided as information only.
1.3.1 The specification referenced in 2.2 uses only inch-pound units.he percent specific gravity of that class.
TABLE 1 Wool Sheet Felt: Thickness and Mass (Weight)
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ASTM (NTA) Class | Color | Thickness, in. | Thickness, mm | Mass (Weight) lb/yd2 | Mass (Weight) kg/m2 |
Nominal | Tolerances | Nominal | Tolerances | Nominal | Tolerances | Nominal | Tolerances |
Sheets | Cut Parts | Sheets | Cut Parts |
26S1 | White | 0.125 | ± 0.014 | ± 0.016 | 3.17 | ± 0.35 | ± 0.41 | 1.50 | ± 0.10 | 0.81 | ± 0.05 |
26S4 | Gray | 0.188 | 0.016 | 0.018 | 4.78 | 0.41 | 0.46 | 2.25 | 0.15 | 1.22 | 0.08 |
| | 0.250 | 0.020 | 0.022 | 6.35 | 0.51 | 0.56 | 3.00 | 0.20 | 1.63 | 0.11 |
| | 0.313 | 0.022 | 0.024 | 7.95 | 0.56 | 0.61 | 3.75 | 0.25 | 2.04 | 0.14 |
| | 0.375 | 0.024 | 0.026 | 9.52 | 0.61 | 0.66 | 4.50 | 0.30 | 2.44 | 0.16 |
| | 0.500 | 0.030 | 0.032 | 12.70 | 0.76 | 0.81 | 6.00 | 0.40 | 3.26 | 0.22 |
| | 0.625 | 0.035 | 0.037 | 15.88 | 0.89 | 0.94 | 7.50 | 0.45 | 4.07 | 0.24 |
| | 0.750 | 0.040 | 0.042 | 19.05 | 1.02 | 1.07 | 9.00 | 0.50 | 4.89 | 0.27 |
| | 0.875 | 0.046 | 0.048 | 22.23 | 1.17 | 1.22 | 10.50 | 0.55 | 5.70 | 0.30 |
| | 1.000 | 0.051 | 0.053 | 25.40 | 1.30 | 1.35 | 12.00 | 0.60 | 6.52 | 0.33 |
| | 1.250 | 0.062 | 0.065 | 31.75 | 1.57 | 1.65 | 15.00 | 0.70 | 8.15 | 0.38 |
| | 1.500 | 0.072 | 0.075 | 38.10 | 1.83 | 1.91 | 18.00 | 0.80 | 9.77 | 0.43 |
| | 1.750 | 0.083 | 0.085 | 44.45 | 2.11 | 2.16 | 21.00 | 0.90 | 11.40 | 0.49 |
| | 2.000 | 0.094 | 0.098 | 50.80 | 2.39 | 2.49 | 24.00 | 1.00 | 13.03 | 0.54 |
| | 2.500 | 0.115 | 0.119 | 63.50 | 2.92 | 3.02 | 30.00 | 1.05 | 16.29 | 0.57 |
| | 3.000 | 0.136 | 0.141 | 76.20 | 3.45 | 3.58 | 36.00 | 1.10 | 19.55 | 0.60 |
34S1 | White | 0.125 | 0.012 | 0.014 | 3.17 | 0.30 | 0.36 | 2.00 | 0.10 | 1.09 | 0.05 |
34S2 | White | 0.188 | 0.012 | 0.014 | 4.78 | 0.30 | 0.36 | 3.00 | 0.15 | 1.63 | 0.08 |
34S3 | White | 0.250 | 0.016 | 0.018 | 6.35 | 0.41 | 0.46 | 4.00 | 0.30 | 2.17 | 0.16 |
34S4 | Gray | 0.313 | 0.017 | 0.019 | 7.95 | 0.43 | 0.48 | 5.00 | 0.35 | 2.71 | 0.19 |
| | 0.375 | 0.019 | 0.021 | 9.52 | 0.48 | 0.53 | 6.00 | 0.40 | 3.26 | 0.22 |
| | 0.500 | 0.022 | 0.024 | 12.70 | 0.56 | 0.61 | 8.00 | 0.50 | 4.34 | 0.27 |
| | 0.625 | 0.026 | 0.028 | 15.88 | 0.66 | 0.71 | 10.00 | 0.60 | 5.43 | 0.33 |
| | 0.750 | 0.029 | 0.031 | 19.05 | 0.74 | 0.79 | 12.00 | 0.70 | 6.52 | 0.38 |
| | 0.875 | 0.032 | 0.034 | 22.23 | 0.87 | 0.86 | 14.00 | 0.75 | 7.60 | 0.41 |
| | 1.000 | 0.036 | 0.038 | 25.40 | 0.91 | 0.97 | 16.00 | 0.80 | 8.69 | 0.43 |
| | 1.250 | 0.042 | 0.045 | 31.25 | 1.07 | 1.14 | 20.00 | 0.90 | 10.86 | 0.49 |
| | 1.500 | 0.049 | 0.052 | 38.10 | 1.24 | 1.32 | 24.00 | 1.00 | 13.03 | 0.54 |
| | 1.750 | 0.056 | 0.059 | 44.45 | 1.42 | 1.50 | 28.00 | 1.10 | 15.20 | 0.60 |
| | 2.000 | 0.063 | 0.067 | 50.80 | 1.60 | 1.70 | 32.00 | 1.20 | 17.38 | 0.65 |
| | 2.500 | 0.076 | 0.080 | 63.50 | 1.93 | 2.03 | 40.00 | 1.25 | 21.72 | 0.68 |
| | 3.000 | 0.090 | 0.095 | 76.20 | 2.29 | 2.41 | 48.00 | 1.30 | 26.06 | 0.71 |
43S1 | White | 0.125 | 0.012 | 0.014 | 3.17 | 0.30 | 0.36 | 2.50 | 0.30 | 1.36 | 0.16 |
43S2 | White | 0.188 | 0.012 | 0.014 | 4.78 | 0.30 | 0.36 | 3.75 | 0.35 | 2.04 | 0.19 |
43S3 | White | 0.250 | 0.014 | 0.016 | 6.35 | 0.36 | 0.41 | 5.00 | 0.40 | 2.71 | 0.22 |
43S4 | Gray | 0.375 | 0.016 | 0.019 | 9.52 | 0.41 | 0.48 | 7.50 | 0.50 | 4.07 | 0.27 |
| | 0.500 | 0.019 | 0.022 | 12.70 | 0.48 | 0.56 | 10.00 | 0.60 | 5.43 | 0.33 |
| | 0.625 | 0.022 | 0.025 | 15.88 | 0.56 | 0.64 | 12.50 | 0.70 | 6.79 | 0.38 |
| | 0.750 | 0.025 | 0.028 | 19.05 | 0.63 | 0.71 | 15.00 | 0.80 | 8.15 | 0.43 |
| | 0.875 | 0.027 | 0.030 | 22.23 | 0.69 | 0.76 | 17.50 | 0.90 | 9.50 | 0.49 |
| | 1.000 | 0.030 | 0.033 | 25.40 | 0.76 | 0.84 | 20.00 | 1.00 | 10.86 | 0.54 |
| | 1.250 | 0.036 | 0.040 | 31.15 | 0.91 | 1.02 | 25.00 | 1.10 | 13.56 | 0.60 |
| | 1.500 | 0.041 | 0.045 | 38.10 | 1.04 | 1.14 | 30.00 | 1.20 | 16.29 | 0.65 |
| | 1.750 | 0.047 | 0.051 | 44.45 | 1.19 | 1.30 | 35.00 | 1.30 | 19.00 | 0.71 |
| | 2.000 | 0.053 | 0.058 | 50.80 | 1.35 | 1.47 | 40.00 | 1.40 | 21.72 | 0.76 |
| | 2.500 | 0.064 | 0.070 | 63.50 | 1.63 | 1.78 | 50.00 | 1.45 | 27.15 | 0.79 |
| | 3.000 | 0.075 | 0.082 | 76.20 | 1.90 | 2.08 | 60.00 | 1.50 | 32.58 | 0.81 |
56S1 | White | 0.125 | 0.010 | 0.014 | 3.17 | 0.25 | 0.36 | 3.25 | 0.40 | 1.76 | 0.22 |
56S2 | White | 0.188 | 0.010 | 0.014 | 4.78 | 0.25 | 0.36 | 4.90 | 0.50 | 2.66 | 0.27 |
56S3 | White | 0.250 | 0.011 | 0.016 | 6.35 | 0.28 | 0.41 | 6.50 | 0.60 | 3.53 | 0.33 |
S654 | Gray | 0.375 | 0.013 | 0.018 | 9.52 | 0.33 | 0.46 | 9.75 | 0.80 | 5.29 | 0.43 |
| | 0.500 | 0.016 | 0.022 | 12.70 | 0.41 | 0.56 | 13.00 | 1.00 | 7.06 | 0.54 |
| | 0.625 | 0.018 | 0.024 | 15.88 | 0.46 | 0.61 | 16.25 | 1.10 | 8.82 | 0.60 |
| | 0.750 | 0.020 | 0.026 | 19.05 | 0.51 | 0.66 | 19.50 | 1.20 | 10.59 | 0.65 |
| | 0.875 | 0.022 | 0.028 | 22.23 | 0.56 | 0.71 | 22.75 | 1.30 | 12.35 | 0.70 |
| | 1.000 | 0.025 | 0.031 | 25.40 | 0.63 | 0.79 | 26.00 | 1.40 | 14.12 | 0.76 |
| | 1.250 | 0.029 | 0.036 | 31.75 | 0.74 | 0.91 | 32.50 | 1.50 | 17.65 | 0.81 |
| | 1.500 | 0.033 | 0.040 | 38.10 | 0.84 | 1.02 | 39.00 | 1.60 | 21.18 | 0.87 |
| | 1.750 | 0.038 | 0.046 | 44.45 | 0.97 | 1.17 | 45.50 | 1.70 | 24.71 | 0.92 |
| | 2.000 | 0.042 | 0.051 | 50.80 | 1.07 | 1.30 | 52.00 | 1.80 | 28.24 | 0.98 |
| | 2.500 | 0.050 | 0.061 | 63.50 | 1.27 | 1.55 | 65.00 | 1.85 | 35.29 | 1.00 |
| | 3.000 | 0.058 | 0.070 | 76.20 | 1.47 | 1.78 | 78.00 | 1.90 | 42.35 | 1.03 |
68S1 | White | 0.125 | 0.007 | 0.013 | 3.17 | 0.18 | 0.33 | 4.00 | 0.50 | 2.17 | 0.27 |
68S2 | White | 0.188 | 0.007 | 0.014 | 4.78 | 0.18 | 0.36 | 6.00 | 0.75 | 3.26 | 0.41 |
68S3 | White | 0.250 | 0.007 | 0.015 | 6.35 | 0.18 | 0.38 | 8.00 | 1.00 | 4.34 | 0.54 |
68S4 | Gray | 0.375 | 0.009 | 0.018 | 9.52 | 0.23 | 0.46 | 12.00 | 1.10 | 6.52 | 0.60 |
| | 0.500 | 0.011 | 0.020 | 12.70 | 0.28 | 0.51 | 16.00 | 1.20 | 8.69 | 0.65 |
| | 0.625 | 0.013 | 0.022 | 15.88 | 0.33 | 0.56 | 20.00 | 1.30 | 10.86 | 0.71 |
| | 0.750 | 0.015 | 0.024 | 19.05 | 0.38 | 0.61 | 24.00 | 1.40 | 13.03 | 0.76 |
| | 0.875 | 0.017 | 0.026 | 22.23 | 0.43 | 0.66 | 28.00 | 1.50 | 15.20 | 0.81 |
| | 1.000 | ±0.019 | ±0.028 | 25.40 | ±0.48 | ±0.71 | 32.00 | ±1.60 | 17.38 | ±0.87 |
| | 1.250 | 0.022 | 0.032 | 31.75 | 0.56 | 0.81 | 40.00 | 1.70 | 21.72 | 0.92 |
| | 1.500 | 0.026 | 0.036 | 38.10 | 0.66 | 0.91 | 48.00 | 1.80 | 26.06 | 0.98 |
| | 1.750 | 0.029 | 0.041 | 44.45 | 0.74 | 1.04 | 56.00 | 1.90 | 30.41 | 1.03 |
| | 2.000 | 0.032 | 0.046 | 50.80 | 0.81 | 1.17 | 64.00 | 2.00 | 34.75 | 1.09 |
| | 2.500 | 0.038 | 0.055 | 63.50 | 0.97 | 1.40 | 80.00 | 2.05 | 43.44 | 1.11 |