POM Homopolymer Balls

POM Homopolymer Balls provide superior stiffness, fatigue endurance, and low friction, making them well-suited for high-precision rolling elements and bearing applications. Compared to copolymers, the homopolymer grade offers higher crystallinity and improved mechanical strength, though with slightly reduced chemical stability. Industries use POM homopolymer balls in valve systems, precision bearings, and check mechanisms across automotive, industrial, and consumer device sectors. Specific applications include low-noise conveyor rollers, ball check valves in fluid handling, and load-bearing swivel joints in measurement instruments. In research, they serve in tribological studies, accelerated wear testing, and validation of polymeric bearing performance. The balance of high mechanical performance and low density ensures their continued use in demanding mechanical systems.

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Tolerance

Properties

Reference & Citations

each

Tolerances

Ball/Sphere

Diameter	Standard	±5%
Diameter	Precision	See Item

Material Properties for Polymers

Chemical Resistance

Element	Value
Acids - concentrated	Poor
Acids - dilute	Poor - Fair
Alcohols	Good-Fair
Alkalis	Poor
Aromatic hydrocarbons	Good
Greases and Oils	Good
Halogenated Hydrocarbons	Good-Poor(?)
Halogens	Poor
Ketones	Good - Fair

Mechanical Properties

Element	Value
Coefficient of friction	0.2-0.35
Hardness - Rockwell	M94
Poisson's ratio	0.35
Elongation at break( % )	40-75
Tensile modulus( GPa )	2.9-3.1
Izod impact strength( J m⁻¹ )	75-130
Tensile strength( MPa )	70

Electrical Properties

Element	Value
Dielectric constant @1MHz	3.7
Dissipation factor @ 1MHz	0.005
Dielectric strength( kV mm⁻¹ )	20
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( % )	0.6-0.9
Water absorption - over 24 hours( % )	0.25
Density( gcm⁻³ )	1.42

Thermal Properties

Element	Value
Heat-deflection temperature - 0.45MPa( C )	170
Heat-deflection temperature - 1.8MPa( C )	135
Upper working temperature( C )	80-120
Specific heat( J K⁻¹ kg⁻¹ )	1500
Thermal conductivity( W m⁻¹ K⁻¹ )	0.22-0.24@23°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ )	122