| These data were obtained by ASTM D-461 Test Methods, ASTM D-2475 Standards, and NTA Wool Felt Specifications. |
| F-13 Specification and Uses | |
| Commercial Standard Grade | 9R4 |
| SAE Number | F-13 |
| NTA Number | 18R3 |
| GENERAL PROPERTIES | |
|---|---|
| Wool Content (fiber basis) | min. 75% |
| Density (1") | 8.48 lbs/sq yd |
| Standard Thickness Range | 1/8" to 1" | fg
| Standard Width | 72" |
| Color | Gray |
| PHYSICAL PROPERTIES | |
| Specific Gravity | 18% |
| Therm. Cond. (70F) | 0.24 btu/hr/sq. ft./°F/in. |
| Thermal Expansion | 0 |
| Air Perm (1/16") | 75-150 cfm/sq ft/0.5"H2O |
| Liquid Absorption by volume |
>350% by weight (1.0 sp gr) 88 |
| Capillarity (wicking height, 575 SSU, 70F) | 2.50 |
| Coef of Friction (1) | 0.37 |
| Vibration Absorption (2) static load bearing cap/unit area dynamic stress endurance |
Low Low |
| Noise Reduction Coef (1") | 0.64 |
| MECHANICAL PROPERTIES | |
| Tensile Strength (min) | 75 psi |
| Elongation (100 psi) | 37% |
| Mullen Bursting Strength (1/8") | 50 psi |
| Split Resistance (min) | 2 lb/2" width |
| Hardness Range | 15-25 Shore A |
| Compressibility (10% defl) | 3 psi |
| Recovery (within 1 min after 10% defl) | 99% |
| Abrasion Resistance (3) | Fair |
| CHEMICAL AND ENVIRONMENTAL PROPERTIES | |
| Effect of Sunlight and Oxidation | None |
| Solvent Resistance and Stability in Oil | Excellent |
| Acid Resistance, dilute concentration |
Fair Fair |
| Alkali Resistance, dilute concentration |
Fair Low |
| Temperature Range | -80 to +200 °F |
| TYPICAL USES | |
| Grease and oil retention, protective lining and insulation for freight cars, trucks, dunnage, uses similar to 9R2 and 9R3 where less durability and lower grade felt is acceptable. | |