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Grade: Copolymer
Formula: POM-C
Form: Ball/Sphere
Material: Polyoxymethylene (POM)
Commodity: Polymers
POM Copolymer Balls, made from polyoxymethylene copolymer, provide excellent dimensional stability, low friction, and high wear resistance, making them indispensable for precision engineering applications. Their high stiffness and resistance to fatigue allow consistent performance under dynamic load, while their chemical resistance supports use in fuel systems, pumps, and valves. Industries such as automotive, aerospace, and medical devices employ POM copolymer balls in bearings, check valves, and flow control devices, benefiting from their combination of strength and self-lubricating properties. Research applications focus on polymer tribology, composite reinforcement, and optimization of lightweight mechanical components. The spherical form ensures uniform load distribution, predictable motion, and minimal frictional losses in mechanical assemblies. With their durability and stability, POM copolymer balls are highly valued in both industrial production and advanced research exploring wear-resistant polymer systems.
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Tolerances

Ball/Sphere
Diameter Standard ±5%
Diameter Precision See Item

Material Properties for Polymers

Chemical Resistance
Element Value
Acids - concentrated Poor
Acids - dilute Good-Fair
Alcohols Good-Fair
Alkalis Good
Aromatic hydrocarbons Good
Greases and Oils Good
Halogenated Hydrocarbons Good-Poor
Halogens Poor
Ketones Good - Fair
Electrical Properties
Element Value
Dielectric constant @1MHz 3.7-4.4
Dissipation factor @ 1MHz 0.006-0.18
Dielectric strength( kV mm⁻¹ ) 20@2.3mm
Surface resistivity( Ohm/sq ) 10¹⁵
Volume resistivity( Ohmcm ) 10¹⁵
Physical Properties
Element Value
Flammability HB
Radiation resistance Poor
Resistance to Ultra-violet Poor
Limiting oxygen index( % ) 15
Water absorption - equilibrium( % ) 0.6-0.8
Water absorption - over 24 hours( % ) 0.2-0.25
Density( gcm⁻³ ) 1.41
Mechanical Properties
Element Value
Hardness - Rockwell M80
Poisson's ratio 0.35
Elongation at break( % ) 15-40
Tensile modulus( GPa ) 2.3-2.8
Izod impact strength( J m⁻¹ ) 70-80
Tensile strength( MPa ) 60-70
Thermal Properties
Element Value
Heat-deflection temperature - 0.45MPa( C ) 160
Heat-deflection temperature - 1.8MPa( C ) 110
Lower working temperature( C ) -40
Upper working temperature( C ) 80-120
Specific heat( J K⁻¹ kg⁻¹ ) 1500
Thermal conductivity( W m⁻¹ K⁻¹ ) 0.23-0.3@23°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ ) 80-120

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