POM-H

POM – Polyacetal

POM-H

POM-H homopolymer has higher mechanical strength, rigidity, hardness, and creep-resistance values than POM-C does, along with a lower thermal expansion coefficient.

Physical properties
  Value Unit Test method
Specific gravity 1.43 g/cm3 DIN EN ISO 1183
Average molecular mass N/A
Water absorption, 24/96 h (23 °C) 0.05/0.1 % DIN EN ISO 62
Weather-resistance moderate
Combustibility HB UL 94 DIN EN ISO 527-2
Food safety yes
Mechanical properties
  Value Unit Test method
Modulus of elasticity 3,600 MPa DIN EN ISO 527-2
Tensile strength 80 MPa DIN EN ISO 527-2
Elongation at break 32 % DIN EN ISO 527-2
Tensile strength at break 43 % DIN EN ISO 527-2
Flexural modulus 3,600 MPa DIN EN ISO 178
Flexural strength 106 MPa DIN EN ISO 178
Compressive modulus 2,800 MPa EN ISO 604
Compressive strength, 1%/2% 22/38 MPa EN ISO 604
Impact strength (Charpy) does not break kJ/m2 DIN EN ISO 179-1eU
Notch impact strength (Charpy) 14 kJ/m2 DIN EN ISO 179-1eA
Notch impact strength (Izod) kJ/m2 DIN EN ISO 180/2A
Toughness (ball pressure) 185 MPa ISO 2039-1
Toughness (Shore D) N/A
Wear-resistance N/A
Coefficient of friction (against steel) N/A
Thermal properties
  Value Unit Test method
Glass-transition temperature -60 °C DIN 53765
Melting point 182 °C DIN 53765
Operating temperature (instantaneous) +150 °C
Operating temperature (continuous) 110 °C
Operating temperature (minimum) N/A
Thermal expansion coefficient, 23–60 °C 11 10-5 K-1 DIN EN ISO 11359-1;2
Thermal expansion coefficient, 23–100 °C 11 10-5 K-1 DIN EN ISO 11359-1;2
Specific heat capacity 1.3 J/(g×K) ISO 22007-4:2008
Thermal conductivity 0.43 W/(m×K) ISO 22007-4:2008
Electrical properties
  Value Unit Test method
Surface resistivity 1014 DIN IEC 60093
Resistivity 1014 Ω×cm DIN IEC 60093
Dielectric strength 38 kV/mm DIN EN 60243-1
CTI value 600 V DIN EN 60112
Optical properties
  Value Unit Test method
Light transmittance N/A
Refractive index N/A
Optical errors N/A
Abrasion-resistance, 100 rotations with 500 g N/A

Additional downloads

Delivery selection sheets, bars, hollow bars
Specific gravity 1.43 g/cm3
Service temperature N/A … 110 °C
Price category €€ (€8–25/kg)

Special properties

  • greater density, hardness, and durability than POM-C
  • less thermal expansion than POM-C
  • better impact- and wear-resistance than POM-C

Applications

pharmaceutical industry, slide applications, clutch elements, thin-walled bushings

Standard colours

white, black

Premade pieces

enquire

Commonly known brands

Ertacetal® H, SUSTARIN® H, TECAFORM® AD, ZELLAMID® 900 H