General performance folding POM is a surface smooth, shiny, hard and dense material, yellow or white, thin-walled portion translucent. Combustion characteristics are easy to burn, away from the fire continued to burn, the flame yellow top, blue bottom, dripping melted, there is a strong irritant smell of formaldehyde, fish stench. POM as a white powder, usually opaque, good color, the proportion of 1.41-1.43 g / cc, mold shrinkage 1.2-3.0% molding temperature 170-200 ℃, dry conditions 80-90 ℃ 2 hours. POM long-term heat resistance is not high, but short-term up to 160 ℃, which are short-term heat resistance than polyethylene POM POM copolymer high above 10 ℃, but the long-term heat rather than homo copolymer POM POM high around 10 ℃. Long-term use in the temperature range of -40 ℃ ~ 100 ℃. POM easy to decompose, the decomposition temperature of 240 degrees. Decomposition irritating and corrosive gases occur, it should be selected mold steel corrosion resistance materials. (1) POM is a crystalline plastic, a density of 1.42g / cm3, it is very good steel, commonly known as the "Race of steel." (2) It has resistance to fatigue, creep, wear resistance, heat resistance, impact resistance, etc. excellent performance, and low coefficient of friction, self-lubricating. (3) POM easy to moisture absorption, water absorption was 0.22% to 0.25%, in a wet environment, good dimensional stability, the shrinkage was 2.1% (larger). When the injection size is difficult to control, heat distortion temperature of 172 ℃, POM POM have two different properties (POM temperature resistance point).