HY-S200C is manufactured through a specially engineered process , it's same as Gore GFO®. High purity micronized graphite is encapsulated in a PTFE matrix structure. The graphitized PTFE yarn combines high thermal conductivity from graphite with all other great properties of PTFE. This combination gives the HY-S200C packing great sealing properties that other products cannot offer: compressible, durable, self-lubricating, chemical resistant and heat dissipating.