PBT was first developed by P. Schlack who is a scientist in 1942. PBT is milky white, translucent to opaque, crystalline thermoplastic polyester. It has high heat resistance, toughness, fatigue resistance, self lubrication, low friction coefficient, weather resistance and low water absorption, which is only 0.1%. It still maintains various physical properties, including electrical insulation, in humid environment. PBT bandage has good stretch and elasticity, which is very suitable for dressing all parts, especially joints.