It is Polyphenylene Sulfide ( PPS ), which is a special type of engineering plastic of excelled performances and crystalloid colophony.
Characteristics of PPS:
1)Bearing the chemical etching;
2)No reaction to Ultraviolet and X-ray;
3)Small dielectric constant, excellent insulation and arc of resistance;
4)Fire-retardant level is up to UL94V-0, Oxygen index is 44-53;
5)Good wear proof ability and self - lubricity.