Polyformaldehyde(Polyoxymethylene) POM 1.Natural color 2.High mechanical properties 3.Good fatigue resistance ... copper materials, but also improving service life; In electronic and electric Industries, such as: shell of electronic spanner,electronic ... , computer, electrograph, calculate graph, bracket of recorder tape and so on. Test ItemTest conditionTest method(ASTM)UnitsTest DataWater absorption23 ...