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POM Plastic CNC Machining Guide

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Polyoxymethylene homopolymer (POM) is an impact- and wear-resistant semi-crystalline thermoplastic widely used in a variety of machining applications. It is favored by machinists for its excellent material properties and high machinability.


Although opaque in nature, POM is available in a variety of colors. It has a density of 1.410-1.420 g/cm3, a crystallinity of 75-85%, and a melting point of 175°C.


POM is well suited for machining, such as milling and lathes. It can also be cut with a laser, and its pellets can be used for injection molding and plastic extrusion.


Today we will mainly introduce the characteristics of this material and the advantages of CNC machining this material.


Electrical properties

POM has excellent thermal insulation properties, coupled with its excellent mechanical strength, POM is a material that is very suitable for electronic components.


POM can also withstand a lot of electrical stress, making it suitable for use as a high-voltage insulator. Its low moisture absorption also makes it an excellent material for keeping electronic components dry.


Mechanical Strength

POM has a tensile strength of 7000-9000 PSI, is very hard, and has great toughness, and is less dense than metal. This makes it suitable for lightweight parts that need to withstand high pressure.


Fatigue Resistance

POM is a very durable material with excellent resistance to fatigue failure in the temperature range of –40° to 80°C. In addition, its fatigue resistance is less affected by moisture, chemicals or solvents. This property makes it an ideal material for parts that need to withstand repeated impact and stress.


Impact Resistance

POM can withstand instantaneous impact without failure, mainly due to its very high toughness. Specially treated POM can provide greater impact resistance.


Good Dimensional Stability

Dimensional stability measures the ability of a material to maintain its normal size after being exposed to pressure, temperature and other conditions during processing. POM does not deform during processing and is very suitable for cutting and can achieve precise tolerances.


Frictional Properties

Moving mechanical parts are usually lubricated to reduce the friction that occurs when they rub against each other. POM machined parts are inherently slippery and do not require lubrication. This feature can be used as part of machinery where external lubricators may contaminate the product, such as food processors.


Robustness

POM’s high tensile strength and durability make it a suitable material for high-stress applications. POM is so strong that it is often used as a replacement for steel and aluminum alloys.


Moisture Resistance

POM absorbs very little moisture even in the most humid conditions. This means that it can maintain its structural integrity even in underwater applications.


Creep Resistance

POM is an extremely tough material that can withstand a lot of stress without failing. This excellent durability makes it a material of choice for parts in many industries.


Electrical Insulation

POM is an excellent insulator. Due to this property, it is used in many electronic products.


Disadvantages of POM


Low Adhesion

Due to its chemical resistance, POM does not react well to adhesives, making it difficult to bond.


Flammability

POM is not self-extinguishing and will burn until there is no more oxygen. Extinguishing a POM fire requires a Class A fire extinguisher.


Heat Sensitivity

Processing POM at high temperatures can cause deformation.


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