Metal spacer of twining etc. by V or W metal bring with nonmetal to is it have overlapping to take, twine in succession, in beginning, end weld with some way is it fix to lead metal.
   Advantage such as being good of the elasticity that the expansion graphite is able to bear the high temperature , corrosion-resistant , flexibility and go back, in twining the spacer series, using temperature to be relatively high of it.The occasion that is most suitable for in temperature reversal is used.It is a quiet sealed component in such flange junctions as pipeline , heat exchanger , tower trough ,etc., use it in such departments as the petroleum , chemistry , electricity , shipbuilding , steel ,etc. extensively.Especially in the high-pressure steam of high temperature, it is most suitable to use at the time of the reversal of cold and hot difference in temperature.Use temperature at most：Oxidizing gas：450℃ Not the oxidizing gas：800℃ Use the pressure at most： 420kgf/cm*cm

   The tooth shape spacer uses the flat ring of metal, by processing the way to process specifically into a wave form of contained angle of 90 degrees on the ring level. Metallic gasket of the cockscomb structure. According to use position and require different, tooth shape spacer can make into inside and outside taking orienting ring and two sides is it stick to soft graphite or combined spacer , polytetrafluoroethylene (PTFE) of thin slice to add.