POM-C
Copolymer acetal (POM-C) is a thermoplastic engineering plastic copolymerized from formaldehyde and a small amount of comonomer (typically ethylene oxide, 1%–5%). The introduction of comonomer disrupts the regularity of the polymer chain, resulting in slightly lower crystallinity than POM-H (70%–75%) but more flexible molecular chains, thereby endowing the material with superior toughness, chemical resistance, and hot-water stability.
Basic Parameters
|
Parameter |
POM-C |
Unit |
|
Density |
1.41 |
g/cm³ |
|
Tensile Strength |
60 – 67 |
MPa |
|
Flexural Strength |
85 – 100 |
MPa |
|
Elastic Modulus |
2700 – 3000 |
MPa |
|
Flexural Modulus |
2500 – 2800 |
MPa |
|
Elongation at Break |
25 – 45 |
% |
|
Rockwell Hardness |
M75 – M90 |
— |
|
Charpy Notched Impact Strength |
5.5 – 7 |
kJ/m² |
|
Melting Point |
164 – 167 |
℃ |
|
HDT (1.82 MPa) |
90 – 100 |
℃ |
|
Continuous Service Temp. |
90 – 100 |
℃ |
|
Water Absorption (24h) |
0.15 – 0.22 |
% |
|
Molding Shrinkage |
1.5 – 2.2 |
% |
|
Surface Resistivity |
1×10¹⁴ – 1×10¹⁵ |
Ω |
|
Dielectric Constant (1 MHz) |
3.8 |
— |
Performance Characteristics：
1）Mechanical Properties
Tensile strength 60–67 MPa, slightly lower than POM-H but still high among engineering plastics
Elastic modulus 2.7–3.0 GPa, slightly lower stiffness but better toughness
Elongation at break 25%–45%, significantly better ductility and toughness than POM-H
Higher impact strength, better absorption of sudden and dynamic loads
2）Thermal Properties
Melting point 164–167℃, about 10℃ lower than POM-H, allowing processing at lower temperatures
Continuous service temperature 90–100℃
Heat deflection temperature (1.82 MPa) 90–100℃
Excellent long-term thermal stability; resistant to depolymerization in hot-water and humid environments
3）Chemical Resistance
Good resistance to most organic solvents, fuels, and oils
Significantly better resistance to strong acids and alkalis than POM-H; comonomer units inhibit chain scission
Excellent hydrolysis resistance, suitable for hot water / steam environments
4）Processing Characteristics
Excellent injection molding performance; machinable
Lower molding shrinkage (1.5%–2.2%), better dimensional stability
No center-line porosity, more uniform thick-wall part quality
Lower post-molding internal stress, superior long-term dimensional stability
Product Series：
General Purpose: unfilled, for general structural parts
Glass-Fiber Reinforced: 10%–30% glass fiber, improved stiffness and dimensional stability
Wear-Resistant / Low-Friction: PTFE, graphite, MoS₂ for sliding components
UV / Weather-Stabilized: UV-stabilized for outdoor applications
Hydrolysis-Resistant: exclusive to POM-C, for hot water / steam environments
Food-Grade / FDA Compliant: FDA-compliant for food-contact components
Application：
Automotive: fuel system parts, window regulators, seatbelt components, snap-fit connectors
Water Treatment & Plumbing: faucet fittings, valves, pipe fittings, pump body components
Electronics & Electrical: connectors, switch components, structural brackets
Medical Devices: components requiring sterilization and chemical resistance
Industrial Equipment: conveyor system components, chemical-resistant piping parts
Food Packaging: food-grade contact parts, conveyor belts, guide rails
keywords: POM-C
classification: Product
Copolymer acetal (POM-C) is a thermoplastic engineering plastic copolymerized from formaldehyde and a small amount of comonomer (typically ethylene oxide, 1%–5%). The introduction of comonomer disrupts the regularity of the polymer chain, resulting in slightly lower crystallinity than POM-H (70%–75%) but more flexible molecular chains, thereby endowing the material with superior toughness, chemical resistance, and hot-water stability.
Basic Parameters
|
Parameter |
POM-C |
Unit |
|
Density |
1.41 |
g/cm³ |
|
Tensile Strength |
60 – 67 |
MPa |
|
Flexural Strength |
85 – 100 |
MPa |
|
Elastic Modulus |
2700 – 3000 |
MPa |
|
Flexural Modulus |
2500 – 2800 |
MPa |
|
Elongation at Break |
25 – 45 |
% |
|
Rockwell Hardness |
M75 – M90 |
— |
|
Charpy Notched Impact Strength |
5.5 – 7 |
kJ/m² |
|
Melting Point |
164 – 167 |
℃ |
|
HDT (1.82 MPa) |
90 – 100 |
℃ |
|
Continuous Service Temp. |
90 – 100 |
℃ |
|
Water Absorption (24h) |
0.15 – 0.22 |
% |
|
Molding Shrinkage |
1.5 – 2.2 |
% |
|
Surface Resistivity |
1×10¹⁴ – 1×10¹⁵ |
Ω |
|
Dielectric Constant (1 MHz) |
3.8 |
— |
Performance Characteristics：
1）Mechanical Properties
Tensile strength 60–67 MPa, slightly lower than POM-H but still high among engineering plastics
Elastic modulus 2.7–3.0 GPa, slightly lower stiffness but better toughness
Elongation at break 25%–45%, significantly better ductility and toughness than POM-H
Higher impact strength, better absorption of sudden and dynamic loads
2）Thermal Properties
Melting point 164–167℃, about 10℃ lower than POM-H, allowing processing at lower temperatures
Continuous service temperature 90–100℃
Heat deflection temperature (1.82 MPa) 90–100℃
Excellent long-term thermal stability; resistant to depolymerization in hot-water and humid environments
3）Chemical Resistance
Good resistance to most organic solvents, fuels, and oils
Significantly better resistance to strong acids and alkalis than POM-H; comonomer units inhibit chain scission
Excellent hydrolysis resistance, suitable for hot water / steam environments
4）Processing Characteristics
Excellent injection molding performance; machinable
Lower molding shrinkage (1.5%–2.2%), better dimensional stability
No center-line porosity, more uniform thick-wall part quality
Lower post-molding internal stress, superior long-term dimensional stability
Product Series：
General Purpose: unfilled, for general structural parts
Glass-Fiber Reinforced: 10%–30% glass fiber, improved stiffness and dimensional stability
Wear-Resistant / Low-Friction: PTFE, graphite, MoS₂ for sliding components
UV / Weather-Stabilized: UV-stabilized for outdoor applications
Hydrolysis-Resistant: exclusive to POM-C, for hot water / steam environments
Food-Grade / FDA Compliant: FDA-compliant for food-contact components
Application：
Automotive: fuel system parts, window regulators, seatbelt components, snap-fit connectors
Water Treatment & Plumbing: faucet fittings, valves, pipe fittings, pump body components
Electronics & Electrical: connectors, switch components, structural brackets
Medical Devices: components requiring sterilization and chemical resistance
Industrial Equipment: conveyor system components, chemical-resistant piping parts
Food Packaging: food-grade contact parts, conveyor belts, guide rails
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