Product Name: Class 150 LB Insulation Gasket Kit, Type F
Standard: ASME B16.5 (WN RF)
Materials:
Gasket: G10 + PTFE
Sleeve: G10
Washer: G10 + ZPS
Gasket Size: 4 Inch, DN100, 100 mm
Pressure Rating: Class 150 LB, PN20
Source: https://www.landeepipefitting.com/class-150-lb-insulation-gasket-kit-type-f-g10-4-in-dn100.html