... points of multichannel sealing ,high temperature endurance, corrosion-resistantance and lower requirement of the coarseness of the flange sealing ... steem, hydrogen, natural gas, pyrolysis gas, and petrol products, acid, alkali,and salt solution,etc.Specification: SPIRAL WOUND GASKETJSD-2003 ... choice: 1/2'' to 60'' DN10 to DN1500Gasket type: basic type, with outer/cantering ring type/ with inner ring ...