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Rulon Bearings

Omnia Plastica Arnite Omnialite POM c Acetal Copolymer
Categories: Polymer; Thermoplastic; Acetal (Polyoxymethylene, POM); Acetal Copolymer, Unreinforced

Material Notes: Polyoxymethylene, commonly called Acetal, is a crystalline polymer obtained from the polymerisation of formaldehyde. Discovered fairly recently (1960), it has enjoyed rapid growth and large acceptance thanks to it’s excellent mechanical features, stability to humidity and ease of machining. All our stock shapes made of POM are marked along the whole length with product code and batch number, according to ISO 9002 standards.

Features:

  • High fatigue resistance
  • Good dimensional stability
  • Low friction coefficient
  • Compressive strength, shock resistance, even at low temperature
  • Excellent machinability especially used on automatic equipment
  • Colour: natural and black
Weak Point:

Compared to PA6 it has a lower abrasion resistance, particularly in dirty and dusty environments.

Application:

  • Mechanical: it is one of the most commonly used engineering plastics for mechanical applications such as bearings, cams, gears with low torque, gear wheels, conveyor rollers and precision machined components requiring dimensional stability and tight tolerances.
  • Food contact: being physiologically inert it is suitable for food contact. It can be used in water at 80° C.
  • Electrical: as it is not hygroscopic, it is commonly used for electric components such as insulators.
  • Chemical: it is resistant to alkali and organic compounds. Thanks to its good chemical properties it is suitable for pump components, flanges and components for chemical plants.

Information provided by Omnia Plastica s.p.a. for semifinished products such as sheet, rod, and tube.

Vendors: No vendors are listed for this material. Please click here if you are a supplier and would like information on how to add your listing to this material.
 
Physical PropertiesMetricEnglishComments
Density 1.41 g/cc0.0509 lb/in³ISO.1183 DIN.53479
Moisture Absorption at Equilibrium 0.20 %0.20 %50% relative humidity
Water Absorption at Saturation 0.70 %0.70 %23°C
 
Mechanical PropertiesMetricEnglishComments
Hardness, Rockwell M 8888dry sample; ISO2039.2
Ball Indentation Hardness 140 MPa20300 psiISO2039.1 DIN.53456
Tensile Strength at Break 66.0 MPa9570 psiISO.527 DIN.53455
Elongation at Break 50 %50 %ISO.527 DIN.53455
Tensile Modulus 2.70 GPa392 ksiISO.527 DIN.53455
Compressive Strength 14.0 MPa2030 psi1% strain over 1000 hours; ISO.899 DIN.53444
Charpy Impact Unnotched NBNB7.5 J; ISO.R179 DIN.53453
Charpy Impact, Notched 0.900 J/cm²4.28 ft-lb/in²ISO179/3C DIN.53453
Coefficient of Friction, Dynamic 0.300.30on dry ground steel; load =0.05MPa; speed =0.6 m/s
 
Electrical PropertiesMetricEnglishComments
Volume Resistivity 1.00e+15 ohm-cm1.00e+15 ohm-cmISO.93 DIN.53482
Dielectric Constant 3.8
@Frequency 1e+6 Hz
3.8
@Frequency 1e+6 Hz
ISO.250 DIN.53483
Dielectric Strength 50.0 kV/mm1270 kV/inISO.243 DIN.53481
Dissipation Factor 0.010
@Frequency 1e+6 Hz
0.010
@Frequency 1e+6 Hz
ISO.250 DIN.53483
 
Thermal PropertiesMetricEnglishComments
CTE, linear 110 µm/m-°C
@Temperature 23.0 - 60.0 °C
61.1 µin/in-°F
@Temperature 73.4 - 140 °F
Thermal Conductivity 0.300 W/m-K2.08 BTU-in/hr-ft²-°FDIN.52612
Melting Point 165 °C329 °F
Maximum Service Temperature, Air 110 °C230 °FContinuous; 5000 hours based on a tensile stress of 50% at 23° C.
 140 °C284 °Fshort period, no load
Deflection Temperature at 1.8 MPa (264 psi) 115 °C239 °FISO.75 DIN.53461
Minimum Service Temperature, Air -50.0 °C-58.0 °Fimpact conditions and heavy loads not considered
Flammability, UL94 HBHB
Oxygen Index 15 %15 %ISO.4589

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

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