POM-H
Homopolymer acetal (POM-H) is a high-crystallinity thermoplastic engineering plastic polymerized from pure formaldehyde via anionic polymerization. The polymer chain consists entirely of C-O bonds, with crystallinity reaching 75%–85%. Its highly regular and uniform molecular chain endows the material with outstanding stiffness, hardness, and tensile strength. POM-H is often referred to as "steel-like" (or "metal-replacing"), being one of the engineering plastics with mechanical strength closest to that of metals.
Basic Parameters
|
Parameter |
POM-H |
Unit |
|
Density |
1.41 – 1.43 |
g/cm³ |
|
Tensile Strength |
66 – 73 |
MPa |
|
Flexural Strength |
90 – 110 |
MPa |
|
Elastic Modulus |
3000 – 3500 |
MPa |
|
Flexural Modulus |
2800 – 3200 |
MPa |
|
Elongation at Break |
15 – 25 |
% |
|
Rockwell Hardness |
M80 – M94 |
— |
|
Charpy Notched Impact Strength |
6 – 8 |
kJ/m² |
|
Melting Point |
≥ 175 |
℃ |
|
HDT (1.82 MPa) / |
95 – 110 |
℃ |
|
Continuous Service Temp. |
90 – 105 |
℃ |
|
Water Absorption (24h) |
0.20 – 0.25 |
% |
|
Molding Shrinkage |
1.8 – 2.5 |
% |
|
Surface Resistivity |
1×10¹⁴ – 1×10¹⁵ |
Ω |
|
Dielectric Constant (1 MHz) |
3.7 |
— |
Performance Characteristics：
1）Mechanical Properties
Tensile strength up to 66–73 MPa, among the highest in engineering plastics
Elastic modulus 3.0–3.5 GPa,
Excellent stiffness, suitable for high-load structural components
Rockwell hardness M80–M94, outstanding wear resistance
Elongation at break 15%–25%, slightly lower toughness than POM-C
2）Thermal Properties
Melting point ≥175℃, approximately 10℃ higher than POM-C
Continuous service temperature 90–105℃
Heat deflection temperature (1.82 MPa) 95–110℃
3）Chemical Resistance
Good resistance to organic solvents, fuels, and oils
Poor resistance to strong acids and alkalis; susceptible to depolymerization in hot water/steam environments
4）Processing Characteristics
Excellent injection molding performance; machinable
Higher molding shrinkage (1.8%–2.5%), mold design optimization required
Thick-wall parts prone to center-line porosity
Product Series：
1）General Purpose: unfilled, for general structural and mechanical parts
2）Glass-Fiber Reinforced: 10%–30% glass fiber, significantly improved stiffness and dimensional stability
3）Low-Friction: PTFE, graphite, MoS₂ lubricant additives for gears, sliders, and high-wear applications
4）UV absorbers and anti-oxidants for outdoor applications
5）Electrostatic Dissipative: conductive carbon fiber / CNT additives for electronics assembly
Application：
- Automotive: precision gears, bearings, clips, seatbelt components, window regulators
- Electronics & Electrical: connectors, switch components, structural brackets, insulators
- Mechanical Engineering: cams, gears, springs, fasteners, bushings
- Medical Devices: fluid delivery components, inhaler parts
- Consumer Goods: zippers, ballpoint pen mechanisms, sprinkler parts
keywords: POM-H
classification: Product
Homopolymer acetal (POM-H) is a high-crystallinity thermoplastic engineering plastic polymerized from pure formaldehyde via anionic polymerization. The polymer chain consists entirely of C-O bonds, with crystallinity reaching 75%–85%. Its highly regular and uniform molecular chain endows the material with outstanding stiffness, hardness, and tensile strength. POM-H is often referred to as "steel-like" (or "metal-replacing"), being one of the engineering plastics with mechanical strength closest to that of metals.
Basic Parameters
|
Parameter |
POM-H |
Unit |
|
Density |
1.41 – 1.43 |
g/cm³ |
|
Tensile Strength |
66 – 73 |
MPa |
|
Flexural Strength |
90 – 110 |
MPa |
|
Elastic Modulus |
3000 – 3500 |
MPa |
|
Flexural Modulus |
2800 – 3200 |
MPa |
|
Elongation at Break |
15 – 25 |
% |
|
Rockwell Hardness |
M80 – M94 |
— |
|
Charpy Notched Impact Strength |
6 – 8 |
kJ/m² |
|
Melting Point |
≥ 175 |
℃ |
|
HDT (1.82 MPa) / |
95 – 110 |
℃ |
|
Continuous Service Temp. |
90 – 105 |
℃ |
|
Water Absorption (24h) |
0.20 – 0.25 |
% |
|
Molding Shrinkage |
1.8 – 2.5 |
% |
|
Surface Resistivity |
1×10¹⁴ – 1×10¹⁵ |
Ω |
|
Dielectric Constant (1 MHz) |
3.7 |
— |
Performance Characteristics：
1）Mechanical Properties
Tensile strength up to 66–73 MPa, among the highest in engineering plastics
Elastic modulus 3.0–3.5 GPa,
Excellent stiffness, suitable for high-load structural components
Rockwell hardness M80–M94, outstanding wear resistance
Elongation at break 15%–25%, slightly lower toughness than POM-C
2）Thermal Properties
Melting point ≥175℃, approximately 10℃ higher than POM-C
Continuous service temperature 90–105℃
Heat deflection temperature (1.82 MPa) 95–110℃
3）Chemical Resistance
Good resistance to organic solvents, fuels, and oils
Poor resistance to strong acids and alkalis; susceptible to depolymerization in hot water/steam environments
4）Processing Characteristics
Excellent injection molding performance; machinable
Higher molding shrinkage (1.8%–2.5%), mold design optimization required
Thick-wall parts prone to center-line porosity
Product Series：
1）General Purpose: unfilled, for general structural and mechanical parts
2）Glass-Fiber Reinforced: 10%–30% glass fiber, significantly improved stiffness and dimensional stability
3）Low-Friction: PTFE, graphite, MoS₂ lubricant additives for gears, sliders, and high-wear applications
4）UV absorbers and anti-oxidants for outdoor applications
5）Electrostatic Dissipative: conductive carbon fiber / CNT additives for electronics assembly
Application：
- Automotive: precision gears, bearings, clips, seatbelt components, window regulators
- Electronics & Electrical: connectors, switch components, structural brackets, insulators
- Mechanical Engineering: cams, gears, springs, fasteners, bushings
- Medical Devices: fluid delivery components, inhaler parts
- Consumer Goods: zippers, ballpoint pen mechanisms, sprinkler parts
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