Product Name: Type F Flange Isolation Gasket Kit
Type: Type F
Standard: ASME B16.5
Size: 1 Inch, DN25
Pressure: Class 150 LB, PN20
Gasket Material: Neoprene-faced Phenolic
Washer Material: G10
Usage: to Match Flange

Source: https://www.landeepipefitting.com/type-f-flange-isolation-gasket-kit-asme-b16-5-1-in-150-lb.html