Poliacetal – POM – A.D.
Chemical Designation: Polyoxymethylene (Homopolymer)
DIN Abbreviation: POM
Colour, Filler: Opaque
Stock Availability: Standard lengths 3 metres, also cut to size
Rod 3 – 250 mm dia
Plate 5 – 100 mm thick
Tube 20 – 300 mm OD
Profile
Finished parts, machined or injection moulded
Poliacetal POM- A.D. is a semicrystalline, thermoplastic engineering material with high strength and rigidity, excellent machinability and varied applications.
Main characteristics: strong and rigid, very good electrical
tough insulation
good sliding properties, easily machined, polished
resistant to dilute acids, not resistant long term
cleaning agents, numerous to water over 60 °C
solvents, easily welded
- Preferred Fields: Mechanical engineering, automotive engineering, transport and conveyor technology, electrical engineering, precision engineering, household appliances, plant construction
Applications: friction bearings, friction strips
gears, plugs
spring elements, insulators
housing parts, snap fit connectors
rollers, seals
Poliacetal – POM A.D.
The following information corresponds with our current knowledge and indicates our products and possible applications. We cannot give a legally binding guarantee of certain properties or the suitability for a specific application. Existing commercial patents must be observed. A definitive quality guarantee is given in our general conditions of sales. Unless otherwise stated, these values represent averages taken from injection moulding samples. We reserve the right of technical alterations.
| Properties | Unit | Test method DIN ASTM | |
| Mechanical | |||
| Density | g/cm³ | 53 479 | 1.42 |
| Tensile strength at yield | MPa | 53 455 | 70 |
| Tensile strength at break | MPa | 53 455 | |
| Elongation at break | % | 53 455 | 40 |
| Modulus of elasticity in tension | MPa | 53 457 | 3300 |
| Modulus of elasticity in flexure | MPa | 53 457 | 2620 |
| Ball indentation hardness | MPa | 53 456 | 170 |
| Impact strength (Charpy) | kJ/m2 | 53 453 | no br. |
| Creep rupture strength after 1000 hrs with static load | MPa | 40 | |
| Time yield limit for 1% elongation after 1000 hrs. | MPa | 13 | |
| Coefficient of friction against hardened and ground steel p = 0,05 N/mm², v = 0,6 m/s | – | 0.34 | |
| Wear conditions as above | µm/km | 4.6 | |
| Thermal | |||
| Crystalline melting point | °C | 53 736 | 175 |
| Glass transition temperature | °C | 53 736 | – 38 |
| Heat distortion temperature Method A Method B | °C °C | ISO 75 ISO 75 | 124 170 |
| Properties | Unit | Test method DIN ASTM | |
| Thermal | |||
| Max. service temperature short term long term | °C °C | 150 100 | |
| Coefficient of thermal conductivity | W/(m . K) | 0.31 | |
| Specific heat | J/(g . K) | 1.5 | |
| Coefficient of thermal expansion | 10-5/K | 10 | |
| Electrical | |||
| Dielectric constant at 105 Hz | 53 483 | 3,7 | |
| Dielectric loss factor at 105 Hz | 53 483 | 0.005 | |
| Specific volume resistance | W . cm | 53 482 | 1015 |
| Surface resistance | W | 53 482 | |
| Dielectric strength 1 mm | kV/mm | 53 481 | >50 |
| Tracking resistance | 53 480 | KA 3c | |
| Miscellaneous | |||
| Moisture absorption: Equilibrium in standard atmosphere (23 °C / 50 % relative humidity) | % | 53 714 | 0.3 |
| Water absorption at saturation at 23 °C | % | 53 495 | 0.5 |
| Resistance to hot water, washing soda | not resistant | ||
| Flammability | UL 94 | HB | |
| Resistance to weathering | not resistant |
* after storage in a standard 23/50 atmosphere (DIN 50 014) to equilibrium
Europlásticos coloca a disposição, também :
- Semi-finished product, finished parts, injection moulded parts and profiles in more than 500 materials and modifications.
- Engineering plastics: PA extruded or cast, POM, PC, PET, PBT, PPE, PP, PE
- High temperature plastics: PI, PEEK, PPS, PES, PPSU, PEI, PSU, PVDF, PCTFE, PTFE
- Stock length: Standard 3 metres
- Pressed/sintered semi-finished product: PI, PEEK, PPS, PTFE/PI and modifications, as well as PCTFE in special sizes ie, large discs, tube and rings with diameters up to about 820 mm
- Material modifications: eg glass, carbon and aramid fibre, talc, MoS2, graphite, PTFE, PE, silicone oil, internal lubrication
- Pultruded stock shapes: matrix polyester, vinylester and epoxy resin with glass or carbon continuous fibre.