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Semi-products and parts made of engineering plastics Polyplasty

Polyoxymethylene

Polypom
Polyoxymethylene (POM) is highly crystalline and  is available in copolymer and homopolymer grades.
POM has minimal water absorption, excellent dimensional stability and the best properties for chip machining. Thanks to its favorable characteristics, great hardness, rigidity and strength with good toughness, chemical resistance and its shear behaviour with abrasion resistance, POM is a successful replacement for metal materials. It is resistant to organic solvents. It also features good resistance to black-light UV-radiation.
Material No.: 1202
Density ISO 1183: 1.41 g/cm3
  Mechanical properties    
 Tensile strength at yield  ISO 527  Mpa
 Elongation  ISO 52765  27 %
 E-Modulus of tensile elasticity  ISO 527  2700 MPa
 Brinell Hardness  ISO 2039-1  145 MPa
 Brinell Hardness Number    H358/30
 Shore (A/D) or Rockwell (R/L/M) Hardness  ISO 868, ISO 2039-2  D81
 Izod notched impact strength at 23 °C  ISO 180/1A  5.5 KJ/m2
 Charpy notched toughness at 23 °C  ISO 179/1eA  6.0 KJ/m2
     
 Electrical properties    
 Permittivity at 50 Hz  IEC 60250  3.8
 Permittivity at 1 MHz  IEC 60250  3.8
 Dielectric loss factor at 50 Hz  IEC 60250  10 1E-4
 Dielectric loss factor at 1 MHz  IEC 60250  50 1E-4
 Dielectric strength  IEC 60243-1  40 kV/mm
 Thickness for dielectric strength    1.0 mm
 Specific dielectric resistance  IEC 60093  1014 Ωm
 Surface resistance  IEC 60093  1014 Ω
 CTI Tracking resistance  IEC 60112  600
     
 Thermal properties    
 Thermal conductivity  DIN 52 612  0.31 W/K.m
 Coefficient of transverse expansion, linear  ISO 11359  110 10-6/K
 Melt or vitrification temperature  ISO 11357  167 °C
 Heat distortion resistance A ISO 75 HDT/A (1.8 MPa)    105 °C
 Max. short-term temperature    140 °C
 Max. long-term temperature    90 5°C
 Min. operating temperature    -50 °C
     
 Other properties    
 Water absorption under regular conditions  ISO 62  0.20 %
 Water absorption in humidity  ISO 62  0.8 %
 Burning behaviour according to UL 94  IEC 60695-11-10 HB  
 UL 94 Thickness    0.8 mm
 Thermal ageing according to UL 746 (RTI)  Mech. W/O Imp.,  40 000 hod.
     
 Special properties    
 Proportional elongation at yield  ISO 527  9.4 %
 Tensile creep modulus (0.5% 1000 hrs)  ISO 899-1  1400 MPa
 Flexural strength  ISO 178  97 MPa
 Fatigue in flexure  ASTM D671  31 MPa
 Izod impact strength at 23 °C  ISO 180/1C  930 KJ/m2
 Izod impact strength at -30 °C  ISO 180/1C  100 KJ/m2
 Izod notched impact strength at -30°C  ISO 180/1A  5.5 KJ/m2
 Charpy impact strength at 23 °C  ISO 179/1eU  210 KJ/m2
 Charpy impact strength at -30 °C  ISO 179/1eU  190 KJ/m2
 Charpy notched impact strength at -30 °C  ISO 179/1eA  5.5 KJ/m2
 Izod notched impact strength at 23 °C  ISO 180/4A  60 J/m
 Coefficient of slip creep compared to steel    0.32-0.40
Wear relative to the measured unit   54 (µm/km)/MPa
CTI M Tracking resistance IEC 60112 600M
Specific heat capacity IEC 1006 1.47 J/g K
Vicat softening point B ISO 306 VST/B/50 (50 N) 150 °C
LOI Acid index ISO 4589 15 %

Areas of use:

  • slip parts
  • guides
  • valve bodies
  • covers
  • coil skeletons (bodies)
  • rolling bearing cages
  • office machines parts
  • pump components
  • gearing components
  • bearings
  • gears
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