Polyoxymethylene
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
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 % |
