POM-C+PTFE AF-H
Matrix
also Delrin AF, Hostaform C LF
AF-H = pOM-H (homopolymer) + 20% PTFE fibre
Homopolymer matrix version: highest stiffness, creep resistance and lowest wear rate, but poorer resistance to hot water/alkali than the copolymer.
Values for the AF-H condition
Other POM-C+PTFE grades and fills
POM-C+PTFE is listed in 5 conditions; see the grade overview at POM-C+PTFE.
Compare all 5 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
dual lubricated (PTFE + silicone oil) | For the lowest stick-slip and start-up friction (e.g. seat rails, appliance slides) where a small oil bleed on the surface is acceptable. | 43 | 45 | 18 | 77 Shore D |
PTFE20Default POM-C + 20% PTFE powder | Default self-lubricating stock-shape/moulding grade for dry-running bushings, slides and gears. | — | 48 | 20 | 79 Shore D |
AF-HThis page POM-H (homopolymer) + 20% PTFE fibre | Homopolymer matrix version: highest stiffness, creep resistance and lowest wear rate, but poorer resistance to hot water/alkali than the copolymer. | — | 50 | 12 | 78 HRM |
POM + ~13% PTFE fibre blend | Choose when you need most of the friction benefit but want to keep toughness and elongation closer to unfilled acetal. | — | 55 | 25 | 80 HRM |
25% glass fibre reinforced, PTFE lubricated | Pick for loaded gears/slides needing high stiffness and creep resistance at temperature; abrasive to soft mating parts. | — | 90 | 3 | 88 HRM |
What is POM-C+PTFE AF-H?
POM-C+PTFE AF-H is POM-C+PTFE in the AF-H condition — homopolymer matrix version: highest stiffness, creep resistance and lowest wear rate, but poorer resistance to hot water/alkali than the copolymer. POM-C+PTFE AF-H has a yield strength of 46 MPa (6.67 ksi) and a tensile strength of 50 MPa (7.25 ksi) — weaker than 55% of polymer grades. Elongation at break is 12% and the elastic modulus is 2.4 GPa (0.348 Msi). POM-C+PTFE AF-H has a density of 1.55 g/cm³ (0.056 lb/in³), heavier than 91% of polymer grades. Its glass-transition temperature is -60°C (-76 °F). PTFE20 is the default condition FabDigit quotes; AF-H is available on request or by drawing note.
Advantages
- Easy to machine — 88/100, better than 92% of polymer grades
- Conducts heat well — 0.33 W/m·K (0.191 BTU/hr·ft·°F), better than 89% of polymer grades
Limitations
- Heavy — 1.55 g/cm³ (0.056 lb/in³), worse than 91% of polymer grades
- Needs corrosion protection — 68/100, worse than 85% of polymer grades
- Difficult to weld — 12/100, worse than 80% of polymer grades
- Degrades in UV without stabilisers — 25/100, worse than 76% of polymer grades
- High mold shrinkage — 1.9%, worse than 75% of polymer grades
POM-C+PTFE AF-H properties
Typical room-temperature values for POM-C+PTFE AF-H; 11 are specific to this condition. Other listed values are POM-C+PTFE reference data and may not represent this condition. Bars are the position among polymer grades.
Physical5
POM-C+PTFE AF-H has a density of 1.55 g/cm³ (0.056 lb/in³), heavier than 91% of polymer grades. Its glass-transition temperature is -60°C (-76 °F).
Mechanical17
POM-C+PTFE AF-H has a yield strength of 46 MPa (6.67 ksi) and a tensile strength of 50 MPa (7.25 ksi) — weaker than 55% of polymer grades. Elongation at break is 12% and the elastic modulus is 2.4 GPa (0.348 Msi).
Thermal11
POM-C+PTFE AF-H is rated for continuous service to 100°C (212 °F). It conducts heat at 0.33 W/m·K (0.191 BTU/hr·ft·°F), better than 89% of polymer grades. Thermal expansion is 110 µm/m·K (61.1 µin/in·°F).
Electrical7
POM-C+PTFE AF-H is an electrical insulator with a dielectric strength of 20 kV/mm (508 V/mil) and a resistivity of 1×10¹² Ω·m.
Chemical & Environmental3
Corrosion resistance is good (68/100), worse than 85% of polymer grades. UV resistance is poor.
Sustainability4
Producing a kilogram of POM-C+PTFE AF-H takes about 105 MJ of energy and emits 5 kg of CO₂ — more than 54% of polymer grades. Typical recycled content is 0%.
Manufacturability8
POM-C+PTFE AF-H's machinability is excellent (88/100, better than 92% of polymer grades); weldability not recommended (12/100); formability poor (25/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with POM-C+PTFE AF-H
Is POM-C+PTFE easy to machine?
Excellent: sharp positive-rake tools, high speed, light feed, air or mist cooling; stress-relieve at 120–140 °C before finish cuts to hold tight tolerances.
Can POM-C+PTFE be welded?
Practically unweldable and unbondable — PTFE migrates to the surface; use mechanical fastening, snap fits or press-fit inserts instead.
Can POM-C+PTFE be formed, bent or molded?
Injection mould at 190–210 °C melt / 70–110 °C tool with generous gates and hold pressure; expect ~1.6–2.2% shrinkage and post-mould shrinkage, avoid melt residence >10 min to prevent formaldehyde evolution.
What surface finishes work on POM-C+PTFE?
No paint, plating or adhesive will hold without flame/plasma or chemical etch pre-treatment; parts are used as-machined or lightly burnished, matte white/grey appearance is normal.
POM-C+PTFE 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 |
|---|---|---|
| PTFE (lubricant, powder or fibre)internal lubricant; 13% typical for fibre blends, 20% for powder | 13 – 20 | 20 |
| heat/antioxidant stabilizer package + pihindered phenol / formaldehyde scavenger, carbon black or TiO₂ | 0.3 – 1 | 0.5 |
| polyoxymethylene copolymer (POM-C, trioxmatrix resin, acetal copolymer | ≥ 78 (balance) | — |
POM-C+PTFE AF-H — frequently asked
What is POM-C+PTFE AF-H used for?
POM-C+PTFE AF-H is typically used for plain bearings and bushings, slide guides and cam followers, gears requiring low-friction operation and conveyor wear strips. In short: lowest-friction acetal grade; bearing-grade POM-C; not bondable or weldable.
What is the yield strength of POM-C+PTFE AF-H?
POM-C+PTFE AF-H has a typical yield strength of 46 MPa (6.67 ksi) and a tensile strength of 50 MPa (7.25 ksi) — weaker than 55% of polymer grades. Strength varies by condition: see the 5 listed tempers.
Is POM-C+PTFE AF-H easy to machine?
Yes — machinability is rated excellent (88/100, better than 92% of polymer grades). Excellent: sharp positive-rake tools, high speed, light feed, air or mist cooling; stress-relieve at 120–140 °C before finish cuts to hold tight tolerances.
Can POM-C+PTFE AF-H be welded?
Not readily — weldability is rated not recommended (12/100). Practically unweldable and unbondable — PTFE migrates to the surface; use mechanical fastening, snap fits or press-fit inserts instead.
What surface finishes work on POM-C+PTFE AF-H?
No paint, plating or adhesive will hold without flame/plasma or chemical etch pre-treatment; parts are used as-machined or lightly burnished, matte white/grey appearance is normal.
Can POM-C+PTFE AF-H be formed, bent or molded?
Injection mould at 190–210 °C melt / 70–110 °C tool with generous gates and hold pressure; expect ~1.6–2.2% shrinkage and post-mould shrinkage, avoid melt residence >10 min to prevent formaldehyde evolution.
What is the maximum service temperature of POM-C+PTFE AF-H?
POM-C+PTFE AF-H is rated for continuous use to about 100°C (212 °F), and briefly to 140°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between POM-C+PTFE PTFE20 and POM-C+PTFE PTFE-SI?
PTFE20 is the default condition — default self-lubricating stock-shape/moulding grade for dry-running bushings, slides and gears. PTFE-SI: for the lowest stick-slip and start-up friction (e.g. seat rails, appliance slides) where a small oil bleed on the surface is acceptable. Yield strength is 46 MPa in PTFE20 versus 43 MPa in PTFE-SI.
Sources
- Hostaform C 9021 TF / lubricated POM-C grade data — Celanese (2023)
- TECAFORM AH LA (POM-C + PTFE) stock shape datasheet — Ensinger (2023)
- Delrin AF 100 / AF Blend PTFE-filled acetal product data — DuPont / Celanese (2022)
- CAMPUS plastics property database — POM-C lubricated grades — CWFG (2024)
- ASM Handbook Vol.2 / Engineering Plastics — acetal resins — ASM International (1988)
- ISO 9988 Polyoxymethylene (POM) moulding and extrusion materials — ISO (2019)
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.