Explains that "PTFE can only be pressed into products that are relatively simple in shape."
Answer: because PTFE powder is easy to agglomerate, large volume, compression ratio and fibrous structure with particles, pressing and sliding transfer difficulties, under the pressure of material filled cavity, particles will not from one channel to another, but the deformation of granular particles, flattened elongated, the the deformation is in a certain range. When the particle by a axial force, the maximum deformation is about 300%. second, this deformation can only be in constant temperature conditions remain unchanged, has been deformed when heating the particles to restore the original shape of the trend, this will make the product warpage, resulting in crack and crack. Therefore only PTFE can products, forming relatively simple shape such as plate, tube, rod, simple container piston rings.