POM-C vs POM-H HI
Polymer · grade comparison
POM-C and POM-H HI are both polymer grades. POM-C is the stronger of the two: yield strength 63 MPa (9.14 ksi) against 45 MPa (6.53 ksi) for POM-H HI, about 40% more; tensile strength follows at 65 MPa (9.43 ksi) vs 45 MPa (6.53 ksi). In exchange, POM-H HI is the more ductile: elongation 220% versus 32% for POM-C, and POM-C is harder (81 Shore D vs 72 Shore D). POM-H HI is lighter (1.34 g/cm³ vs 1.41 g/cm³ for POM-C) and POM-C is stiffer (2.8 GPa vs 1.4 GPa). On the shop floor, POM-C machines more easily (excellent vs very good), POM-H HI welds better (45 vs 35 out of 100), and POM-C sits in a lower cost tier (standard, $$) than POM-H HI (premium, $$$).
POM-CChoose it when strength drives the design, or when the part sees heat.
POM-H HIChoose it when the part is bent, formed or impact-loaded, or when weight is the constraint.
POM-C vs POM-H HI: 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.
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
Shear Modulus
Bulk Modulus
Poisson's Ratio
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
Physical
Density and transition temperatures.
Density
Melting Temperature (Tm)
Water Absorption (24 h)
Water Absorption (Saturation)
Refractive Index
Same in both: Glass Transition (Tg) -60°C-76 °F
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Specific Heat Capacity
Thermal Expansion (CTE, 20–100 °C)
Max Service Temperature (continuous)
Heat Deflection Temp. @ 0.45 MPa
Heat Deflection Temp. @ 1.8 MPa
Limiting Oxygen Index
Max Service Temperature (short-term)
Same in both: Min Service Temperature -50°C-58 °F · Vicat Softening Point (B50) 158°C316 °F
Electrical
Conductivity and insulation.
Dielectric Strength
Surface Resistivity
Same in both: Electrical Resistivity 1×10¹² Ω·m3.94×10¹⁹ µΩ·in · Dielectric Constant (1 MHz) 3.7 · Dissipation Factor (1 MHz) 0.005 · Volume Resistivity 1×10¹⁴ Ω·cm · Comparative Tracking Index (CTI) 600 V
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Corrosion Resistance
Same in both: UV / Weathering Resistance 30 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Weldability
Formability (cold)
Melt Flow Rate
Processing Melt Temperature (typ.)
Same in both: Polishability 55 / 100 · Mold Shrinkage 2% · Mold Temperature (typ.) 90°C194 °F
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Same in both: 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 0.1 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 | POM-H HI |
|---|---|---|
| CNC machining | Yes | — |
| Sheet metal | Yes | — |
| Injection molding | Yes | — |
| Default condition | Unfilled | — |
| Relative cost | $$ Standard | $$$ Premium |
| Min. machined wall | 0.5 mm | — |
| Best machined surface | Ra 0.8 µm | — |
| Chrome Plating (Plastic) | Yes | — |
| EMI Shielding Coating | Yes | — |
| Painting | Yes | — |
| Soft Touch Coating | Yes | — |
| Spray Painting | Yes | — |
| UV Coating | Yes | — |
POM-C vs POM-H HI — frequently asked
Is POM-C stronger than POM-H HI?
Yes. POM-C has a typical yield strength of 63 MPa (9.14 ksi) against 45 MPa (6.53 ksi) for POM-H HI — about 40% more. Tensile strength is 65 MPa (9.43 ksi) vs 45 MPa (6.53 ksi).
Which is cheaper, POM-C or POM-H HI?
POM-C is the lower-cost material: it sits in the standard tier ($$) while POM-H HI is premium ($$$). 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 or POM-H HI?
POM-C. Its machinability rates excellent (88/100) against very good (72/100) for POM-H HI; for welding the order is POM-H HI first (fair, 45/100) then POM-C (fair, 35/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in POM-C and POM-H HI 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.