... ,wood flour,hexamine, pigment and other materials. 1. Common Compression moulding grade:Model R131: the lowest grade, can be suitable ... technical property as D141, can be suitable for making injection handle, knob, socket, plug, and other components. Model 151J: ... than 141J, can be suitable for making higher grade injection handle, knob, electrical appliances, and mechanical components. Model 161J: ...