... heat insulation resistance Pingxiang City Zhongxing Chemical Packing co.ltd is a professional manufacture which produced delrin ball. ... plastic ball is mainly used in cars, sensor, valves, pumps, valves, bathroom, electronic, bearing, electric appliances, and other ... Mainly used in cars, plastic ball valves, pumps, sensor, wei yu, electronic, ball valves, bearings, electric appliances, and ...