POM-C MF (mineral-filled) MF-GB
Reinforced grade
also Celcon M25
MF-GB = glass-bead / spherical mineral filled POM-C
Choose when isotropic shrinkage and minimum warpage matter more than strength; spherical filler avoids fibre orientation effects.
Values for the MF-GB condition
Other POM-C MF (mineral-filled) grades and fills
POM-C MF (mineral-filled) is listed in 8 conditions; see the grade overview at POM-C MF (mineral-filled).
Compare all 8 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
Impact-modified mineral filled POM-C | Elastomer-toughened mineral grade for snap-fits and clips that must survive impact yet stay dimensionally stable. | 43 | 44 | 20 | 76 Shore D |
Mineral filled + PTFE/silicone lubricated bearing grade | For low-warpage sliding parts: filler holds dimensions while PTFE or silicone lowers friction and wear rate. | 47 | 48 | 6 | 80 Shore D |
30 % mineral filled POM-C | Highest mineral loading for maximum dimensional stability and stiffness where impact loading is low. | 52 | 52 | 4 | — |
UV/weather-stabilized mineral filled POM-C | Pick for outdoor or under-hood parts exposed to sunlight; carbon black plus HALS/UV absorber suppress chalking and surface cracking. | 54 | 55 | 8 | 82 Shore D |
MF20Default 20 % mineral (talc/CaCO₃) filled POM-C, standard low-warpage grade | The mainstream mineral-filled acetal: best balance of low shrinkage, stiffness and cost for precision moulded housings and brackets. | 55 | 56 | 8 | 82 HRM |
MF-GBThis page Glass-bead / spherical mineral filled POM-C | Choose when isotropic shrinkage and minimum warpage matter more than strength; spherical filler avoids fibre orientation effects. | 55 | 55 | 6 | 83 Shore D |
Heat-stabilized mineral filled POM-C | Extra thermal/oxidative stabilizer package for long-term service near 110–120 °C, e.g. under-hood or hot-water contact parts. | 55 | 56 | 7 | 82 Shore D |
10 % mineral filled POM-C | Light mineral loading when only modest shrinkage/warpage reduction is needed and toughness must be preserved. | 58 | 58 | 15 | — |
What is POM-C MF (mineral-filled) MF-GB?
POM-C MF (mineral-filled) MF-GB is POM-C MF (mineral-filled) in the MF-GB grade — choose when isotropic shrinkage and minimum warpage matter more than strength; spherical filler avoids fibre orientation effects. POM-C MF (mineral-filled) MF-GB has a yield strength of 55 MPa (7.98 ksi) and a tensile strength of 55 MPa (7.98 ksi) — stronger than 62% of polymer grades. Elongation at break is 6% and the elastic modulus is 4.2 GPa (0.609 Msi). POM-C MF (mineral-filled) MF-GB has a density of 1.62 g/cm³ (0.0585 lb/in³), heavier than 94% of polymer grades. Its glass-transition temperature is -60°C (-76 °F). MF20 is the default condition FabDigit quotes; MF-GB is available on request or by drawing note.
Advantages
- Conducts heat well — 0.42 W/m·K (0.243 BTU/hr·ft·°F), better than 95% of polymer grades
- Stiff — 4.2 GPa (0.609 Msi), better than 87% of polymer grades
- Low embodied carbon — 3 kg CO₂/kg, better than 83% of polymer grades
Limitations
- Heavy — 1.62 g/cm³ (0.0585 lb/in³), worse than 94% of polymer grades
- Degrades in UV without stabilisers — 25/100, worse than 76% of polymer grades
POM-C MF (mineral-filled) MF-GB properties
Typical room-temperature values for POM-C MF (mineral-filled) MF-GB; 27 are specific to this condition. Other listed values are POM-C MF (mineral-filled) reference data and may not represent this condition. Bars are the position among polymer grades.
Physical5
POM-C MF (mineral-filled) MF-GB has a density of 1.62 g/cm³ (0.0585 lb/in³), heavier than 94% of polymer grades. Its glass-transition temperature is -60°C (-76 °F).
Mechanical15
POM-C MF (mineral-filled) MF-GB has a yield strength of 55 MPa (7.98 ksi) and a tensile strength of 55 MPa (7.98 ksi) — stronger than 62% of polymer grades. Elongation at break is 6% and the elastic modulus is 4.2 GPa (0.609 Msi).
Thermal11
POM-C MF (mineral-filled) MF-GB is rated for continuous service to 100°C (212 °F). It conducts heat at 0.42 W/m·K (0.243 BTU/hr·ft·°F), better than 95% of polymer grades. Thermal expansion is 75 µm/m·K (41.7 µin/in·°F).
Electrical7
POM-C MF (mineral-filled) MF-GB 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 very good (72/100), worse than 70% of polymer grades. UV resistance is poor.
Sustainability4
Producing a kilogram of POM-C MF (mineral-filled) MF-GB takes about 82 MJ of energy and emits 3 kg of CO₂ — less than 83% of polymer grades. Typical recycled content is 0%.
Manufacturability8
POM-C MF (mineral-filled) MF-GB's machinability is good (60/100, better than 51% of polymer grades); weldability poor (30/100); formability poor (20/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with POM-C MF (mineral-filled) MF-GB
Is POM-C MF (mineral-filled) easy to machine?
Machines cleanly with sharp carbide tools, high speed and light feed; mineral is abrasive so expect 2–3× tool wear versus unfilled POM, and relieve moulded-in stress before tight-tolerance finishing.
Can POM-C MF (mineral-filled) be welded?
Hot-plate, vibration and ultrasonic welding work but joint strength is reduced by the filler; adhesive bonding requires flame/plasma or chromic-acid etch pretreatment.
Can POM-C MF (mineral-filled) be formed, bent or molded?
Inject at 190–215 °C melt / 70–110 °C mould with generous gates and holding pressure; keep melt residence short (<8 min) to avoid formaldehyde evolution and always vent the mould.
What surface finishes work on POM-C MF (mineral-filled)?
Not paintable or platable without surface activation; filler gives a matt, slightly grainy surface, so texture the tool rather than aiming for high gloss.
POM-C MF (mineral-filled) 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 |
|---|---|---|
| mineral filler (talc / calcium carbonatesurface-treated for coupling; talc most common | 10 – 30 | 20 |
| stabilizer package (antioxidant, formald | 0.3 – 1.5 | 0.8 |
| lubricant / processing aid | 0.1 – 0.5 | 0.2 |
| polyoxymethylene copolymer (oxymethylenePOM-C base resin | ≥ 68 (balance) | — |
POM-C MF (mineral-filled) MF-GB — frequently asked
What is POM-C MF (mineral-filled) MF-GB used for?
POM-C MF (mineral-filled) MF-GB is typically used for precision molded housings, low-warpage flat components and cost-sensitive consumer hardware. In short: lowest-warpage acetal grade; stiffer than unfilled POM; abrasive on tooling.
What is the yield strength of POM-C MF (mineral-filled) MF-GB?
POM-C MF (mineral-filled) MF-GB has a typical yield strength of 55 MPa (7.98 ksi) and a tensile strength of 55 MPa (7.98 ksi) — stronger than 62% of polymer grades. Strength varies by condition: see the 8 listed tempers.
Is POM-C MF (mineral-filled) MF-GB easy to machine?
Reasonably — machinability is rated good (60/100, better than 51% of polymer grades). Machines cleanly with sharp carbide tools, high speed and light feed; mineral is abrasive so expect 2–3× tool wear versus unfilled POM, and relieve moulded-in stress before tight-tolerance finishing.
Can POM-C MF (mineral-filled) MF-GB be welded?
Not readily — weldability is rated poor (30/100). Hot-plate, vibration and ultrasonic welding work but joint strength is reduced by the filler; adhesive bonding requires flame/plasma or chromic-acid etch pretreatment.
What surface finishes work on POM-C MF (mineral-filled) MF-GB?
Not paintable or platable without surface activation; filler gives a matt, slightly grainy surface, so texture the tool rather than aiming for high gloss.
Can POM-C MF (mineral-filled) MF-GB be formed, bent or molded?
Inject at 190–215 °C melt / 70–110 °C mould with generous gates and holding pressure; keep melt residence short (<8 min) to avoid formaldehyde evolution and always vent the mould.
What is the maximum service temperature of POM-C MF (mineral-filled) MF-GB?
POM-C MF (mineral-filled) MF-GB 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 MF (mineral-filled) MF20 and POM-C MF (mineral-filled) MF-IM?
MF20 is the default condition — the mainstream mineral-filled acetal: best balance of low shrinkage, stiffness and cost for precision moulded housings and brackets. MF-IM: elastomer-toughened mineral grade for snap-fits and clips that must survive impact yet stay dimensionally stable. Yield strength is 55 MPa in MF20 versus 43 MPa in MF-IM.
Sources
- Hostaform / Celcon acetal copolymer product range and processing guide — Celanese (2023)
- Ultraform (POM) product line and processing data — BASF (2022)
- CAMPUS plastics database — POM-C mineral-filled ISO 10350 datasets — CWFG / CAMPUS (2024)
- ISO 9988 Plastics — Polyoxymethylene (POM) moulding and extrusion materials — ISO (2020)
- ASM Handbook Vol. 2 / Engineering Plastics — acetal resins — ASM International (1988)
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.