F-7 SAE Pressed Felt
F-7 SAE Pressed Felt is a pressed wool felt with a minimum of 80% wool content (SAE Specification J314 F-7, ASTM Classification D2475 26R3, Federal Specification C-F-206G 12R3), rated for service from -80°F to +200°F (-62°C to +93°C). It delivers 250 psi minimum tensile strength, 6 psi compressibility at 10% deflection, and 99% recovery within 1 minute after 10% deflection. Supplied in grey with a standard roll width of 72″ (1.83 m) in thicknesses from 1/8″ to 1″. On a firmness scale of 1–10, the F-7 rates a 7.
Key Properties
- Hardness Range (Shore A): 20–30 — ASTM D2240
- Tensile Strength (min): 250 psi — ASTM D412
- Compressibility (10% defl.): 6 psi — ASTM D461
- Nominal Specific Density: 0.26 g/cm³ — —
- Temperature Range: -80°F to +200°F | -62°C to +93°C — —
- Liquid Absorption — By Weight: > 225% (1.0 sp gr) — ASTM D461
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- Specifications
- Applications
- General Info
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Physical Properties
| Property | Value | Test Method |
| Material | Felt | — |
| Color | Grey | — |
| Minimum Wool Content | 80% | — |
| Specification (J314) | F-7 | — |
| ASTM Classification (D2475) | 26R3 | ASTM D2475 |
| Federal Specification (C-F-206G) | 12R3 | — |
| Nominal Specific Density | 0.26 g/cm³ | — |
| Standard Thickness Range | 1/8″ to 1″ | 3.17mm to 25.4mm | — |
| Standard Width | 72″ | 1.83m | — |
Mechanical Properties
| Property | Value | Test Method |
| Hardness Range (Shore A) | 20–30 | ASTM D2240 |
| Tensile Strength (min) | 250 psi | ASTM D412 |
| Elongation 100% (100 psi) | 21 | ASTM D461 |
| Mullen Bursting Strength (1/8″) | 125 psi | ASTM D461 |
| Split Resistance (min) | 12 lb/2″ width | — |
| Compressibility (10% defl.) | 6 psi | ASTM D461 |
| Recovery (within 1 min after 10% defl.) | 99% | ASTM D461 |
| Vibration Absorption — Static Load Bearing Cap/Unit Area | Medium | — |
| Vibration Absorption — Dynamic Stress Endurance | Medium | — |
Thermal Properties
| Property | Value | Test Method |
| Temperature Range | -80°F to +200°F | -62°C to +93°C | — |
| Thermal Condition (70°F) | 0.30 btu / hr / sq ft / °F / in | ASTM D461 |
| Thermal Expansion | 0 | ASTM D461 |
Acoustic / Physical Properties
| Property | Value | Test Method |
| Noise Reduction Coefficient (1″) | 0.58 | ASTM D461 |
| Coefficient of Friction | 0.37 | ASTM D461 |
| Air Permeability (1/16″) | 20–50 cfm / sq ft / 0.5″ H₂O | ASTM D461 |
| Capillarity (Wicking Height, 575 SSU, 70°F) | 3 | ASTM D461 |
| Liquid Absorption — By Weight | > 225% (1.0 sp gr) | ASTM D461 |
| Liquid Absorption — By Volume | 80% | ASTM D461 |
Chemical Resistance
| Property | Value | Test Method |
| Abrasion Resistance | Good | — |
| Effect of Sunlight and Oxidation | None | — |
| Solvent Resistance and Stability in Oil | Excellent | — |
| Acid Resistance — Dilute | Good | ASTM D461 |
| Acid Resistance — Concentrated | Fair | ASTM D461 |
| Alkali Resistance — Dilute | Fair | ASTM D461 |
| Alkali Resistance — Concentrated | Low | ASTM D461 |
Thickness & Weight Tolerances (Imperial)
| Nominal (Inches) | Limits (Inches) | Nominal (lb/yd²) | Limits (lb/yd²) |
| 1/8 | 0.111 – 0.139 | 1.53 | 1.45 – 1.61 |
| 3/16 | 0.172 – 0.204 | 2.29 | 2.17 – 2.41 |
| 1/4 | 0.232 – 0.268 | 3.06 | 2.90 – 3.22 |
| 5/16 | 0.293 – 0.333 | 3.82 | 3.62 – 4.02 |
| 3/8 | 0.353 – 0.397 | 4.59 | 4.35 – 4.83 |
| 1/2 | 0.474 – 0.526 | 6.12 | 5.80 – 6.44 |
| 5/8 | 0.595 – 0.655 | 7.65 | 7.25 – 8.05 |
| 3/4 | 0.716 – 0.784 | 9.18 | 8.70 – 9.66 |
| 7/8 | 0.837 – 0.913 | 10.71 | 10.15 – 11.27 |
| 1 | 0.958 – 1.042 | 12.24 | 11.60 – 12.88 |
Thickness & Weight Tolerances (Metric)
| Nominal (mm) | Limits (mm) | Nominal (kg/m²) | Limits (kg/m²) |
| 3.1 | 2.82 – 3.53 | 0.83 | 0.79 – 0.87 |
| 4.8 | 4.37 – 5.18 | 1.24 | 1.18 – 1.31 |
| 6.4 | 5.89 – 6.81 | 1.66 | 1.57 – 1.75 |
| 8.0 | 7.44 – 8.46 | 2.07 | 1.96 – 2.18 |
| 9.5 | 8.97 – 10.08 | 2.49 | 2.36 – 2.62 |
| 12.7 | 12.04 – 13.36 | 3.32 | 3.14 – 3.49 |
| 15.9 | 15.11 – 16.43 | 4.15 | 3.93 – 4.36 |
| 19.1 | 18.19 – 19.91 | 4.98 | 4.72 – 5.24 |
| 22.2 | 21.26 – 23.19 | 5.80 | 5.50 – 6.11 |
| 25.4 | 24.33 – 26.47 | 6.63 | 6.29 – 6.98 |
Compliance
- ASTM D2475 — Compliant (Classification 26R3)
- Dust shields and wipers requiring a compliant, resilient grey wool felt
- Grease retainer washers and wicks in lubrication systems requiring high liquid absorption
- Vibration mountings requiring medium static and dynamic vibration absorption performance
- Industrial felt components across a broad thickness range (1/8″ to 1″) in 72″-wide roll format
- Applications requiring resilient felt with moderate wool content and a grey appearance
Common industries: Industrial equipment, lubrication systems, dust control, precision manufacturing, automotive.
F-7 SAE Pressed Felt is a grey pressed wool felt at 20–30 Shore A with a minimum of 80% wool content — the lowest in the SAE pressed felt series — rated 7 on a firmness scale of 1–10, and classified as ASTM D2475 26R3. It shares the same firmness rating and compressibility profile as F-5 but is grey in color and has lower minimum wool content and tensile strength.
It is suited for dust shields, wipers, grease retainer washers, wicks, vibration mountings, and applications requiring a resilient, compliant felt. The standard roll width of 72″ (1.83m) supports wide-format fabrication from 1/8″ to 1″ thickness.
The material achieves 99% recovery after deflection, medium static and medium dynamic vibration absorption, and a noise reduction coefficient of 0.58 at 1 in. Liquid absorption by weight exceeds 225% and by volume is 80%. Air permeability is 20–50 cfm/sq ft/0.5″ H₂O. Thermal condition is 0.30 btu/hr/sq ft/°F/in at 70°F.
Compliant with ASTM D2475 — Classification 26R3.
What differentiates F-7 SAE Pressed Felt from the F-5 and higher-performance SAE felt grades?
F-7 SAE Pressed Felt shares the same 26R classification density and firmness rating (7 on a scale of 1–10) as F-5 but is grey in color and has a lower minimum wool content (80% vs. 95% for F-5), lower tensile strength (250 psi vs. 400 psi min.), and lower split resistance (12 lb/2" vs. 18 lb/2"). Both static and dynamic vibration absorption are rated Medium (vs. Medium static / High dynamic for F-5). F-7 is the appropriate selection when a grey color, lower wool content, or the 26R3 ASTM classification is required, and where the reduced tensile strength profile is acceptable for the application.
Why is hardness important for felt selection in industrial applications?
Hardness in pressed felt governs how the material deforms under load, which directly affects its performance in sealing, wicking, and vibration absorption applications. F-7's 20–30 Shore A hardness and 6 psi compressibility at 10% deflection indicate a soft, easily compressed felt appropriate for dust shields, wipers, and resilient vibration mountings where conformability and absorption are prioritized. Its 99% recovery after deflection confirms reliable elastic response after repeated compression cycles.
What is the temperature range for F-7 SAE Pressed Felt?
F-7 SAE Pressed Felt is rated for service from -80°F to +200°F (-62°C to +93°C), as listed on the TDS.
Is F-7 SAE Pressed Felt suitable for specification-controlled industrial environments?
Yes. F-7 SAE Pressed Felt is classified as ASTM D2475 26R3 and meets Federal Specification C-F-206G 12R3, as listed on the TDS.
How should F-7 SAE Pressed Felt be specified?
Specify grade (F-7 SAE Pressed Felt), thickness, compliance requirements (ASTM D2475 26R3 / C-F-206G 12R3), dimensional tolerances, and finished format.
