SAE F-1 Wool Felt FR (F-1 FR)
Flame-retardant grade
also J314 F-1
Choose for transit, aerospace interior or electrical enclosure padding where self-extinguishing behaviour is specified.
Values for the FR condition
Other SAE F-1 Wool Felt tempers and conditions
SAE F-1 Wool Felt is listed in 2 conditions; see the grade overview at SAE F-1 Wool Felt.
- FR
- OIL
Compare all 2 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
FRThis page F-1 FR | Choose for transit, aerospace interior or electrical enclosure padding where self-extinguishing behaviour is specified. | — | 2 | 35 | — | 0.05 W/m·K |
F-1 oil-saturated | Pick when the felt must store and meter lubricant (bearing wicks, spindle oilers, wiper rings) rather than seal dry. | — | 3 | 45 | — | 0.08 W/m·K |
What is SAE F-1 Wool Felt FR?
SAE F-1 Wool Felt FR is SAE F-1 Wool Felt in the FR grade — choose for transit, aerospace interior or electrical enclosure padding where self-extinguishing behaviour is specified. SAE F-1 Wool Felt FR has a tensile strength of 2 MPa (0.348 ksi), weaker than 89% of natural material grades. Elongation at break is 35% and the elastic modulus is 0.01 GPa (0.0012 Msi). SAE F-1 Wool Felt FR has a density of 0.34 g/cm³ (0.0123 lb/in³), lighter than 87% of natural material grades.
Advantages
- Ductile — tolerates forming and impact — 35%, better than 91% of natural material grades
- Lightweight — 0.34 g/cm³ (0.0123 lb/in³), better than 87% of natural material grades
Limitations
- Low stiffness — 0.01 GPa (0.0012 Msi), worse than 96% of natural material grades
- High embodied carbon — 12 kg CO₂/kg, worse than 93% of natural material grades
- Poor heat conductor — 0.05 W/m·K (0.0306 BTU/hr·ft·°F), worse than 89% of natural material grades
SAE F-1 Wool Felt FR properties
Typical room-temperature values for SAE F-1 Wool Felt FR; 11 are specific to this condition. Other listed values are SAE F-1 Wool Felt reference data and may not represent this condition. Bars are the position among natural material grades.
Physical2
SAE F-1 Wool Felt FR has a density of 0.34 g/cm³ (0.0123 lb/in³), lighter than 87% of natural material grades.
Mechanical4
SAE F-1 Wool Felt FR has a tensile strength of 2 MPa (0.348 ksi), weaker than 89% of natural material grades. Elongation at break is 35% and the elastic modulus is 0.01 GPa (0.0012 Msi).
Thermal4
SAE F-1 Wool Felt FR is rated for continuous service to 100°C (212 °F). It conducts heat at 0.05 W/m·K (0.0306 BTU/hr·ft·°F), worse than 89% of natural material grades.
Electrical1
SAE F-1 Wool Felt FR has an electrical resistivity of 1×10⁷ Ω·m.
Chemical & Environmental1
Corrosion resistance is fair (40/100), worse than 57% of natural material grades.
Sustainability4
Producing a kilogram of SAE F-1 Wool Felt FR takes about 63 MJ of energy and emits 12 kg of CO₂ — more than 89% of natural material grades. Typical recycled content is 0%.
Manufacturability1
SAE F-1 Wool Felt FR's machinability is excellent (85/100, better than 63% of natural material grades).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with SAE F-1 Wool Felt FR
Is SAE F-1 Wool Felt easy to machine?
Die-cut, kiss-cut, waterjet or rotary-slit; keep blades sharp and support the felt — routing/turning fuzzes the edge.
Can SAE F-1 Wool Felt be welded?
Not weldable; join by sewing, stapling, or contact/pressure-sensitive adhesive with a scrim backing.
Can SAE F-1 Wool Felt be formed, bent or molded?
Can be steam-softened and compression-formed into washers, cones and channel seals; recovers ~80–90 % after moderate compression.
What surface finishes work on SAE F-1 Wool Felt?
Commonly impregnated with oil, wax, resin or FR/mothproof chemistry; no coating or plating is applicable.
SAE F-1 Wool Felt chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| moisture (regain, as received)conditioned at 65 % RH; not a constituent of the dry felt | 0 – 12 | 8 |
| residual lanolin / processing oils | 0 – 1.5 | 0.5 |
| wool (new virgin fiber)SAE J314 F-grade felts of highest quality are all-new wool; no reprocessed fiber permitted in F-1 | ≥ 95 (balance) | — |
SAE F-1 Wool Felt FR — frequently asked
What is SAE F-1 Wool Felt FR used for?
SAE F-1 Wool Felt FR is typically used for polishing wheels, seals, wick applications and cushioning pads. In short: firmest SAE wool felt; low compressibility grade; holds oil for wicking.
What is the tensile strength of SAE F-1 Wool Felt FR?
SAE F-1 Wool Felt FR has a typical tensile strength of 2 MPa (0.348 ksi) — weaker than 89% of natural material grades. Strength varies by condition: see the 2 listed tempers.
Is SAE F-1 Wool Felt FR easy to machine?
Yes — machinability is rated excellent (85/100, better than 63% of natural material grades). Die-cut, kiss-cut, waterjet or rotary-slit; keep blades sharp and support the felt — routing/turning fuzzes the edge.
Can SAE F-1 Wool Felt FR be welded?
Not weldable; join by sewing, stapling, or contact/pressure-sensitive adhesive with a scrim backing.
What surface finishes work on SAE F-1 Wool Felt FR?
Commonly impregnated with oil, wax, resin or FR/mothproof chemistry; no coating or plating is applicable.
Can SAE F-1 Wool Felt FR be formed, bent or molded?
Can be steam-softened and compression-formed into washers, cones and channel seals; recovers ~80–90 % after moderate compression.
What is the maximum service temperature of SAE F-1 Wool Felt FR?
SAE F-1 Wool Felt FR is rated for continuous use to about 100°C (212 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- SAE J314 — Felt, Wool and Part Wool — SAE International (2012)
- ASTM D461 — Standard Test Methods for Felt — ASTM (2020)
- Pressed wool felt grade specifications (SAE F-series) — Industrial felt mills (2023)
- Eco-property data for wool fiber and felt — CES/Granta EduPack (2022)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.