This standard specifies the dimensions, types, design, materials and marking requirements of spiral wound gaskets for use in conjunction with flat face or raised face flanges complying with EN 1759-1 for Class designations 150, 300, 600, 900 and 1500 for sizes up to and including NPS 24 (DN600), and for Class designation 2500 up to and including NPS 12 (DN300).