| Designation |
| Polyoxymethylene, acetal (copolymer) |
| Tradenames |
| Aartel, Altech, Ashlene, Bluestar, Celcon, Delta, Duracon, Duratel, Duratuf, Dynamix, Edgetek, Ekatal, Epimix, Formocon, Germaform, Hifill, Hostaform, Isotal, Iupital, Kebaform, Kepital, Kocetal, Latan, LNP Stat-Loy, Lucel, Luvocom, Next, Next Signature, Plaslube, Polyform, Quadrant, Ramtal, Schulaform, Tarnoform, Tecaform, Tekuform, Tenac-C, Tenopom, Tepcon, Terez, Tynea, Ultraform, Yuncon, Yuntianhua |
| Typical uses |
| Bearings, gears, electrical kettles, snap-fit components, chemical pumps, bathroom scales, pulley wheels, domestic appliance housings, shower heads, fuel expansion tanks, toys. |
| Compositional summary |
| Copolymer of (CH2-O)n (from formaldehyde or trioxane) with small amounts (<5%) of a comonomer such as -(CH2-CH2-O)- (from ethylene oxide or dioxolane) |
| Material family | Plastic (thermoplastic, semi-crystalline) |
| Base material | POM(co) (Polyoxymethylene / acetal coploymer) |
| Polymer code | POM (co) |
| Composition detail (polymers and natural materials) |
| Polymer | 100 | % |
| Physical properties |
| Density | 1390-1410 | kg/m^3 |
| Mechanical properties | | | | |
|---|
| Young’s modulus | 2.6 | – | 3.2 | GPa |
| Specific stiffness | 1.86 | – | 2.29 | MN.m/kg |
| Yield strength (elastic limit) | 57.2 | – | 71.7 | MPa |
| Tensile strength | 71.5 | – | 89.6 | MPa |
| Specific strength | 40.9 | – | 51.2 | kN.m/kg |
| Elongation | 15 | – | 75 | % strain |
| Compressive modulus | 3.02 | – | 3.17 | GPa |
| Compressive strength | 105 | – | 116 | MPa |
| Flexural modulus | 2.54 | – | 3.09 | GPa |
| Flexural strength (modulus of rupture) | 85.4 | – | 94.1 | MPa |
| Shear modulus | 0.933 | – | 1.15 | GPa |
| Bulk modulus | 4.41 | – | 4.63 | GPa |
| Poisson’s ratio | 0.386 | – | 0.401 | |
| Shape factor | 5 | | | |
| Hardness – Vickers | 17 | – | 22 | HV |
| Hardness – Rockwell M | 75 | – | 90 | |
| Hardness – Rockwell R | 111 | – | 122 | |
| Elastic stored energy (springs) | 563 | – | 898 | kJ/m^3 |
| Fatigue strength at 10^7 cycles | 22 | – | 26 | MPa |
| Impact & fracture properties | | | | | |
|---|
| Fracture toughness | | 3.8 | – | 4.2 | MPa.m^0.5 |
| Toughness (G) | | 4.81 | – | 6.36 | kJ/m^2 |
| Impact strength, notched 23 °C | | 4.14 | – | 7.51 | kJ/m^2 |
| Impact strength, notched -30 °C | | 4.09 | – | 6.56 | kJ/m^2 |
| Impact strength, unnotched 23 °C | | 99.9 | – | 120 | kJ/m^2 |
| Impact strength, unnotched -30 °C | | 75.2 | – | 90.2 | kJ/m^2 |
| Thermal properties | | | | |
|---|
| Melting point | 160 | – | 175 | °C |
| Glass temperature | -60 | – | -50 | °C |
| Heat deflection temperature 0.45MPa | 155 | – | 166 | °C |
| Heat deflection temperature 1.8MPa | 85 | – | 121 | °C |
| Maximum service temperature | 83 | – | 97 | °C |
| Minimum service temperature | -50 | – | -40 | °C |
| Thermal conductivity | 0.221 | – | 0.239 | W/m.°C |
| Specific heat capacity | 1280 | – | 1310 | J/kg.°C |
| Thermal expansion coefficient | 110 | – | 198 | µstrain/°C |
| Thermal shock resistance | 109 | – | 208 | °C |
| Thermal distortion resistance | 0.00116 | – | 0.0021 | MW/m |
| Electrical properties | | | | | |
|---|
| Electrical resistivity | | 3.3e20 | – | 3e21 | µohm.cm |
| Electrical conductivity | | 5.75e-20 | – | 5.22e-19 | %IACS |
| Dielectric constant (relative permittivity) | | 3.6 | – | 3.8 | |
| Dissipation factor (dielectric loss tangent) | | 9.5e-4 | – | 0.00105 | |
| Dielectric strength (dielectric breakdown) | | 18.9 | – | 20.5 | MV/m |
| Comparative tracking index | | 300 | – | 600 | V |
| Processing properties | |
|---|
| Polymer injection molding | Acceptable |
| Polymer extrusion | Acceptable |
| Polymer thermoforming | Unsuitable |
| Linear mold shrinkage | 1.82 | – | 2.2 | % |
| Melt temperature | 142 | – | 232 | °C |
| Mold temperature | 80 | – | 100 | °C |
| Molding pressure range | 55 | – | 138 | MPa |
| Durability | |
|---|
| Water (fresh) | Excellent |
| Water (salt) | Excellent |
| Weak acids | Acceptable |
| Strong acids | Unacceptable |
| Weak alkalis | Excellent |
| Strong alkalis | Excellent |
| Organic solvents | Acceptable |
| Oxidation at 500C | Unacceptable |
| UV radiation (sunlight) | Poor |
| Flammability | Highly flammable |
| Processing energy, CO2 footprint & water | | | | |
|---|
| Polymer extrusion energy | 5.7 | – | 6.3 | MJ/kg |
| Polymer extrusion CO2 | 0.427 | – | 0.472 | kg/kg |
| Polymer extrusion water | 4.78 | – | 7.16 | l/kg |
| Polymer molding energy | 15.2 | – | 16.8 | MJ/kg |
| Polymer molding CO2 | 1.14 | – | 1.26 | kg/kg |
| Polymer molding water | 11.2 | – | 16.7 | l/kg |
| Coarse machining energy (per unit wt removed) | 1.22 | – | 1.35 | MJ/kg |
| Coarse machining CO2 (per unit wt removed) | 0.0918 | – | 0.101 | kg/kg |
| Fine machining energy (per unit wt removed) | 7.96 | – | 8.8 | MJ/kg |
| Fine machining CO2 (per unit wt removed) | 0.597 | – | 0.66 | kg/kg |
| Grinding energy (per unit wt removed) | 15.5 | – | 17.1 | MJ/kg |
| Grinding CO2 (per unit wt removed) | 1.16 | – | 1.28 | kg/kg |
MODULUS METAL
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