POM-C GF25 GF25-HS
Additive grade
also Celcon GC25, Ultraform N2320 G25
GF25-HS = gF25 heat stabilized
For long-term hot-air or hot-water service (e.g. 110–120 °C automotive/appliance parts) where standard stabilization would degrade.
Values for the GF25-HS condition
Other POM-C GF25 grades and fills
POM-C GF25 is listed in 10 conditions; see the grade overview at POM-C GF25.
Compare all 10 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
GF25 uncoupled | Cheapest reinforced option: gives stiffness and low CTE but low fiber–matrix adhesion, so strength stays near unfilled level. | — | 62 | 2.2 | 86 Shore D |
10% glass fiber reinforced POM-C | Use when moderate stiffness gain is wanted while keeping much of the toughness and surface quality of unfilled acetal. | — | 78 | 5 | — |
GF25 low-warpage | Glass plus mineral filler balances shrinkage anisotropy for flat, dimensionally critical plates and covers. | — | 85 | 3 | 88 Shore D |
glass reinforced, PTFE lubricated bearing grade | Choose for stiff gears/bushings that also need low friction and low wear against steel. | — | 100 | 2.5 | 85 Shore D |
20% glass fiber reinforced POM-C | Intermediate step below GF25 when a little more toughness and easier filling are required. | — | 105 | 3.5 | 86 Shore D |
GF25 UV/weather stabilized | Carbon-black plus UV-stabilizer package for outdoor and under-hood parts with sunlight exposure. | — | 112 | 2.8 | 88 Shore D |
GF25Default 25% chopped glass fiber reinforced | Standard stiffness/dimensional-stability grade; the default balance of modulus, HDT and moldability. | — | 115 | 3 | — |
GF25-HSThis page GF25 heat stabilized | For long-term hot-air or hot-water service (e.g. 110–120 °C automotive/appliance parts) where standard stabilization would degrade. | — | 115 | 3 | 88 Shore D |
GF25 coupled | Pick when maximum tensile/flexural strength and creep resistance are needed and slight loss of flow is acceptable. | — | 130 | 3 | 89 Shore D |
30% glass fiber reinforced POM-C | Highest-stiffness standard reinforced acetal for structural housings and load-carrying brackets; most brittle and most abrasive to tooling. | — | 130 | 2.5 | — |
What is POM-C GF25 GF25-HS?
POM-C GF25 GF25-HS is POM-C GF25 in the GF25-HS grade — for long-term hot-air or hot-water service (e.g. 110–120 °C automotive/appliance parts) where standard stabilization would degrade. POM-C GF25 GF25-HS has a tensile strength of 115 MPa (16.7 ksi), stronger than 92% of polymer grades. Elongation at break is 3% and the elastic modulus is 8.5 GPa (1.23 Msi). POM-C GF25 GF25-HS has a density of 1.6 g/cm³ (0.0578 lb/in³), heavier than 92% of polymer grades. Its glass-transition temperature is -60°C (-76 °F). GF25 is the default condition FabDigit quotes; GF25-HS is available on request or by drawing note.
Advantages
- Stiff — 8.5 GPa (1.23 Msi), better than 91% of polymer grades
- Conducts heat well — 0.35 W/m·K (0.202 BTU/hr·ft·°F), better than 91% of polymer grades
- Easy to machine — 72/100, better than 76% of polymer grades
Limitations
- Heavy — 1.6 g/cm³ (0.0578 lb/in³), worse than 92% of polymer grades
- Limited ductility — 3%, worse than 83% of polymer grades
- Limited formability — 12/100, worse than 83% of polymer grades
- Hard to polish — 30/100, worse than 82% of polymer grades
- Degrades in UV without stabilisers — 25/100, worse than 76% of polymer grades
POM-C GF25 GF25-HS properties
Typical room-temperature values for POM-C GF25 GF25-HS; 26 are specific to this condition. Other listed values are POM-C GF25 reference data and may not represent this condition. Bars are the position among polymer grades.
Physical5
POM-C GF25 GF25-HS has a density of 1.6 g/cm³ (0.0578 lb/in³), heavier than 92% of polymer grades. Its glass-transition temperature is -60°C (-76 °F).
Mechanical14
POM-C GF25 GF25-HS has a tensile strength of 115 MPa (16.7 ksi), stronger than 92% of polymer grades. Elongation at break is 3% and the elastic modulus is 8.5 GPa (1.23 Msi).
Thermal11
POM-C GF25 GF25-HS is rated for continuous service to 115°C (239 °F). It conducts heat at 0.35 W/m·K (0.202 BTU/hr·ft·°F), better than 91% of polymer grades. Thermal expansion is 35 µm/m·K (19.4 µin/in·°F).
Electrical7
POM-C GF25 GF25-HS is an electrical insulator with a dielectric strength of 22 kV/mm (558.8 V/mil) and a resistivity of 1×10¹² Ω·m.
Chemical & Environmental3
Corrosion resistance is very good (80/100), worse than 52% of polymer grades. UV resistance is poor.
Sustainability4
Producing a kilogram of POM-C GF25 GF25-HS takes about 85 MJ of energy and emits 3.8 kg of CO₂ — less than 79% of polymer grades. Typical recycled content is 0%.
Manufacturability8
POM-C GF25 GF25-HS's machinability is very good (72/100, better than 76% of polymer grades); weldability poor (28/100); formability not recommended (12/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with POM-C GF25 GF25-HS
Is POM-C GF25 easy to machine?
Machines easily with sharp positive-rake tools and high speeds, but the glass is abrasive — use carbide or PCD, expect 2–4x tool wear vs unfilled POM and dust extraction for fine chips.
Can POM-C GF25 be welded?
Ultrasonic, vibration and hot-plate welding work but joint strength is limited by fiber orientation at the weld line; adhesive bonding requires plasma/flame or chemical surface activation.
Can POM-C GF25 be formed, bent or molded?
Dry lightly (2–3 h at 80–100 °C) if humid, mold at 195–215 °C melt / 80–110 °C tool, avoid melt residence >10 min and >230 °C to prevent formaldehyde evolution; use generous gates and vent for anisotropic shrinkage and warpage control.
What surface finishes work on POM-C GF25?
Paint and print only after flame/plasma or primer treatment — untreated acetal has very low surface energy; fiber read-through limits gloss, so texture (VDI/EDM) rather than polish is normally specified.
POM-C GF25 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 |
|---|---|---|
| glass fiberchopped E-glass, typically 10–13 µm diameter | 23 – 27 | 25 |
| coupling agent / adhesion promotersilane or polyurethane-type; absent in uncoupled compounds | 0 – 1.5 | 0.6 |
| stabilizers (formaldehyde scavenger, ant | 0.2 – 1 | 0.5 |
| pigment / carbon blackblack and UV grades only | 0 – 1 | 0.3 |
| polyoxymethylene copolymer (trioxane/dioPOM-C base resin | ≥ 72 (balance) | — |
POM-C GF25 GF25-HS — frequently asked
What is POM-C GF25 GF25-HS used for?
POM-C GF25 GF25-HS is typically used for structural gears, precision housings, load-bearing brackets, pump impellers and electrical connector bodies. In short: stiffest acetal grade; low creep under sustained load; abrasive to tooling.
What is the tensile strength of POM-C GF25 GF25-HS?
POM-C GF25 GF25-HS has a typical tensile strength of 115 MPa (16.7 ksi) — stronger than 92% of polymer grades. Strength varies by condition: see the 10 listed tempers.
Is POM-C GF25 GF25-HS easy to machine?
Yes — machinability is rated very good (72/100, better than 76% of polymer grades). Machines easily with sharp positive-rake tools and high speeds, but the glass is abrasive — use carbide or PCD, expect 2–4x tool wear vs unfilled POM and dust extraction for fine chips.
Can POM-C GF25 GF25-HS be welded?
Not readily — weldability is rated poor (28/100). Ultrasonic, vibration and hot-plate welding work but joint strength is limited by fiber orientation at the weld line; adhesive bonding requires plasma/flame or chemical surface activation.
What surface finishes work on POM-C GF25 GF25-HS?
Paint and print only after flame/plasma or primer treatment — untreated acetal has very low surface energy; fiber read-through limits gloss, so texture (VDI/EDM) rather than polish is normally specified.
Can POM-C GF25 GF25-HS be formed, bent or molded?
Dry lightly (2–3 h at 80–100 °C) if humid, mold at 195–215 °C melt / 80–110 °C tool, avoid melt residence >10 min and >230 °C to prevent formaldehyde evolution; use generous gates and vent for anisotropic shrinkage and warpage control.
What is the maximum service temperature of POM-C GF25 GF25-HS?
POM-C GF25 GF25-HS is rated for continuous use to about 115°C (239 °F), and briefly to 150°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
Sources
- Celcon / Hostaform glass-reinforced acetal copolymer grade data — Celanese (2023)
- Ultraform N2320 G-series (glass-fibre reinforced POM) product information — BASF (2022)
- CAMPUS plastics database — POM-C GF25 ISO 10350 datasets — CWFG / CAMPUS consortium (2024)
- Engineered Materials Handbook Vol. 2: Engineering Plastics — ASM International (1988)
- ISO 9988-2 Polyoxymethylene (POM) moulding and extrusion materials — Preparation of test specimens and determination of properties — ISO (2020)
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.