... coarseness of the flange sealing surface.It is widly used in power plant, aviation,petrochemical,and valve industry,etc.It is ... applied in the medium of steem, hydrogen, natural gas, pyrolysis gas, ... petrol products, acid, alkali,and salt solution,etc.Specification: SPIRAL WOUND GASKETJSD-2003 For static sealing of flange pipe, valve, vessel ...