Gland Packing Chesterton is one type of packing gland produced by Chesterton. Gland Packing or Mechanical Seals are both very important components of shafts and pumps. Countless engineering applications depend on this device to function correctly. The constituent material can be graphite, acrylate, PTFE, asbestos and so on. We sell chesterton at the best prices and fast delivery.