PTFE Graphite Fiber Packing
Gland packing or Compression packing or packing was created as a sealing device (pengeblok tool), but because he had to drip, then it is more correctly referred to as a restrictional device (barrier tool). Gland packing born ahead of MechanicalSeal. Usually made with braided or woven in the shape of a cross section of the box. Materials can be resolved into graphite, asbestos, PTFE, Acrilic and so on.