Pom plastic cnc machined parts High Performance Plastics ODM OEM

POM Description

(1) POM is a crystalline plastic with a density of 1.42g/cm3, and its rigidity is very good,

commonly known as "Saigang".
(2) It has excellent properties such as fatigue resistance, creep resistance, wear

resistance, heat resistance, impact resistance, etc., and has a small friction coefficient

and good self-lubrication.
(3) POM is not easy to absorb moisture, the water absorption rate is 0.22-0.25%, the

dimensional stability is good in a humid environment, the shrinkage rate is 2.1% (larger),

the size is difficult to control during injection molding, and the thermal deformation

temperature is 172 ℃. There are two types of polyoxymethylene, which have different

properties (homopolyoxymethylene has better temperature resistance).

Features

(1) POM does not need to be dried before processing, and it is best to preheat during

processing (about 80 °C), which is good for product dimensional stability.
(2) The processing temperature of POM is very narrow (0 ~ 215 ℃), and it will

decompose when it stays in the barrel for a little longer or the temperature exceeds

220 ℃, producing irritating formaldehyde gas.
(3) When the POM material is injected, the holding pressure should be larger (similar

to the injection pressure) to reduce the pressure drop. The screw speed should not be

too high, and the residual amount should be small;