Product Name: 12 Inch Flat Gasket
Design Standard: ASME B16.21
Material: Expanded Graphite, with Tanged Insert (SS 316/316L)
Size: 12 Inch, DN300
Pressure Rating: Class 150 LB, PN20
Thickness: 1.5 mm
Source: https://www.landeepipefitting.com/12-inch-flat-gasket-asme-b16-21-expanded-graphite-150-lb.html