Product Item: Insulation Gasket Kits
Gasket Type: Type F
Class Rating: Class 900 LB
Thickness: 6 mm
Gasket Material: PTFE Reinforced with Stainless Steel SS 316 Core
Seal: Spring Energized Teflon Seal
Sleeves: Mylar
Washers (Double): G-10, Carbon Steel, Zinc Plated, Hardened Steel, Teflon Coated
Source: https://www.landee.cn/insulation-gasket-kits-type-f-ptfe-gasket-cl900-thk-6-mm.html