| These data were obtained by ASTM D-461 Test Methods, ASTM D-2475 Standards, and NTA Wool Felt Specifications. |
| F-7 Specification and Uses | |
| Commercial Standard Grade | 12R3 |
| SAE Number | F-7 |
| NTA Number | 26R3 |
| GENERAL PROPERTIES | |
|---|---|
| Wool Content (fiber basis) | min. 80% |
| Density (1") | 12.24 lbs/sq yd |
| Standard Thickness Range | 1/8" to 1" |
| Standard Width | 72" |
| Color | Gray |
| PHYSICAL PROPERTIES | |
| Specific Gravity | 26% |
| Therm. Cond. (70F) | 0.30 btu/hr/sq. ft./°F/in. |
| Thermal Expansion | 0 |
| Air Perm (1/16") | 20-50 cfm/sq ft/0.5"H2O |
| Liquid Absorption by volume |
>225% by weight (1.0 sp gr) 80 |
| Capillarity (wicking height, 575 SSU, 70F) | 3.00 |
| Coef of Friction (1) | 0.37 |
| Vibration Absorption (2) static load bearing cap/unit area dynamic stress endurance |
Medium Medium |
| Noise Reduction Coef (1") | 0.58 |
| MECHANICAL PROPERTIES | |
| Tensile Strength (min) | 250 psi |
| Elongation (100 psi) | 21% |
| Mullen Bursting Strength (1/8") | 125 psi |
| Split Resistance (min) | 12 lb/2" width |
| Hardness Range | 20-30 Shore A |
| Compressibility (10% defl) | 6 psi |
| Recovery (within 1 min after 10% defl) | 99% |
| Abrasion Resistance (3) | Good |
| CHEMICAL AND ENVIRONMENTAL PROPERTIES | |
| Effect of Sunlight and Oxidation | None |
| Solvent Resistance and Stability in Oil | Excellent |
| Acid Resistance, dilute concentration |
Good fair |
| Alkali Resistance, dilute concentration |
Fair Low |
| Temperature Range | -80 to +200 °F |
| TYPICAL USES | |
| Dust shields, oil and grease retainers, similar to 12R1 and 12R2 where a lower grade is acceptable. | |