Polly Acetal (POM)

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Polly Acetal (POM)

Details of PollyAcetal (POM) plastic

Polyoxymethylene (POM), also known as polyacetal or polyformaldehyde, is a high-performance engineering thermoplastic. It is known for its high stiffness, low friction, and excellent dimensional stability.

Here are some key details about POM:

Properties

  • Chemical Formula: (CH₂O)ₙ

  • Density: 1.41–1.42 g/cm³

  • Melting Point: 165 °C (329 °F)

  • Electrical Resistivity: 14×10¹⁵ Ω⋅cm

  • Heat Capacity: 1500 J/kg·K

Characteristics

  • High Strength and Rigidity: POM is known for its high strength and rigidity, even at low temperatures.

  • Low Friction: It has a low coefficient of friction, making it ideal for applications requiring smooth movement.

  • Dimensional Stability: POM maintains its shape and size under various conditions, making it suitable for precision parts.

  • Chemical Resistance: It is resistant to many chemicals, including solvents and fuels.

Applications

POM is widely used in various industries due to its excellent properties:

  • Automotive: Small gear wheels, fasteners, and lock systems.

  • Consumer Electronics: Components requiring high precision and durability.

  • Medical: Parts that require high performance and reliability.

  • Industrial: Bearings, bushings, and other components subjected to high wear and friction.

Types

There are two main types of POM:

  • Homopolymer POM: Known for its high strength, stiffness, and dimensional stability. Commonly used in mechanical applications.

  • Copolymer POM: Offers enhanced resistance to stress cracking and chemical degradation. Used in environments with harsh chemicals or repeated mechanical stress.

POM is available in various forms, including sheets, rods, and tubes, and can be produced with additives to enhance specific properties like wear resistance or chemical stability.



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