... plastic , and has the good function of machine, electricity , bear to whet t, sizes stability, bear the chemistrys eroding, and especially ... the lubricate function is good. It is good project plactic to act for the metals, and especially copper aluminum, zinc ... realms. 2.Polyoxymethylene has the good function of machine, electricity f, bear to whet t, sizes stability, bear the chemistrys eroding, and ...