POM-C LF (PTFE-filled) vs POM-C MF (mineral-filled)
Polymer · grade comparison
POM-C LF (PTFE-filled) and POM-C MF (mineral-filled) are both polymer grades. POM-C MF (mineral-filled) is the stronger of the two: yield strength 55 MPa (7.98 ksi) against 45 MPa (6.53 ksi) for POM-C LF (PTFE-filled), about 22% more; tensile strength follows at 56 MPa (8.12 ksi) vs 47 MPa (6.82 ksi). In exchange, POM-C LF (PTFE-filled) is the more ductile: elongation 20% versus 8% for POM-C MF (mineral-filled). POM-C MF (mineral-filled) is stiffer (4 GPa vs 2.5 GPa) and POM-C MF (mineral-filled) conducts heat better (0.4 W/m·K vs 0.32 W/m·K). On the shop floor, POM-C LF (PTFE-filled) machines more easily (excellent vs very good), POM-C MF (mineral-filled) welds better (poor vs not recommended), and POM-C MF (mineral-filled) sits in a lower cost tier (standard, $$) than POM-C LF (PTFE-filled) (premium, $$$).
POM-C LF (PTFE-filled)Choose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
POM-C MF (mineral-filled)Choose it when strength drives the design, or when it will be welded.
POM-C LF (PTFE-filled) vs POM-C MF (mineral-filled): propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all polymer grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
How to read these bars
- One bar per material. A full bar is the highest value among all polymer grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
POM-C LF (PTFE-filled)POM-C MF (mineral-filled)
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
Shear Modulus
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Compressive Strength
Compressive Modulus
Flexural Strength
Flexural Modulus
Shear Strength
Fracture Toughness (K_IC)
Izod Impact, Notched
Hardness, Shore D
Hardness, Rockwell M
Hardness, Rockwell R
Same in both: Poisson's Ratio 0.38
Physical
Density and transition temperatures.
Density
Water Absorption (24 h)
Same in both: Melting Temperature (Tm) 166°C331 °F · Glass Transition (Tg) -60°C-76 °F · Water Absorption (Saturation) 0.65%
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Thermal Expansion (CTE, 20–100 °C)
Min Service Temperature
Heat Deflection Temp. @ 0.45 MPa
Heat Deflection Temp. @ 1.8 MPa
Vicat Softening Point (B50)
Limiting Oxygen Index
Same in both: Specific Heat Capacity 1,400 J/kg·K0.33 BTU/lb·°F · Max Service Temperature (continuous) 100°C212 °F · Max Service Temperature (short-term) 140°C284 °F
Electrical
Conductivity and insulation.
Dielectric Constant (1 MHz)
Dissipation Factor (1 MHz)
Same in both: Electrical Resistivity 1×10¹² Ω·m3.94×10¹⁹ µΩ·in · Dielectric Strength 20 kV/mm508 V/mil · Volume Resistivity 1×10¹⁴ Ω·cm · Surface Resistivity 1×10¹⁴ Ω · Comparative Tracking Index (CTI) 600 V
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
UV / Weathering Resistance
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Weldability
Mold Shrinkage
Processing Melt Temperature (typ.)
Same in both: Formability (cold) 25 / 100 · Polishability 50 / 100 · Melt Flow Rate 8 g/10 min · Mold Temperature (typ.) 90°C194 °F
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Same in both: Embodied Water 200 L/kg24 gal/lb · Typical Recycled Content 0%
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
Modulus of Resilience
Same in both: Thermal Diffusivity 0.2 mm²/s · Thermal Shock Resistance Index 0
Strength versus weight
Yield strength against density for every polymer grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
Manufacturing and finishing
| Capability | POM-C LF (PTFE-filled) | POM-C MF (mineral-filled) |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$ Premium | $$ Standard |
| Min. machined wall | — | — |
| Best machined surface | — | — |
POM-C LF (PTFE-filled) vs POM-C MF (mineral-filled) — frequently asked
Is POM-C MF (mineral-filled) stronger than POM-C LF (PTFE-filled)?
Yes. POM-C MF (mineral-filled) has a typical yield strength of 55 MPa (7.98 ksi) against 45 MPa (6.53 ksi) for POM-C LF (PTFE-filled) — about 22% more. Tensile strength is 56 MPa (8.12 ksi) vs 47 MPa (6.82 ksi).
Which is cheaper, POM-C LF (PTFE-filled) or POM-C MF (mineral-filled)?
POM-C MF (mineral-filled) is the lower-cost material: it sits in the standard tier ($$) while POM-C LF (PTFE-filled) is premium ($$$). Part price depends far more on geometry, tolerance and quantity than on raw stock — upload a CAD file for a live quote.
Which is easier to machine, POM-C LF (PTFE-filled) or POM-C MF (mineral-filled)?
POM-C LF (PTFE-filled). Its machinability rates excellent (88/100) against very good (72/100) for POM-C MF (mineral-filled); for welding the order is POM-C MF (mineral-filled) first (poor, 30/100) then POM-C LF (PTFE-filled) (not recommended, 5/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in POM-C LF (PTFE-filled) and POM-C MF (mineral-filled) side by side — material, machining time, tolerance and finish in one quote. Certified material data ships with the order on request.
Typical handbook values for the conditions named above, normalised for comparison. Hardness on non-Brinell scales is converted approximately for charting only. Request certified data with your order for design-critical properties.