Puffed PTFE sheet,using puffed PTFE as production raw material, based on the patent equipments and technology from USA, has changed the situation of depending on the importation overseas and reduced the cost. Puffed PTFE board has many fibrous coriaceous structure inside,which makes the material has better performance in anti-cold flow and anti- creep ,at the same time, greatly strengthens the ability of gasket in anti-actual effects.