Flange and Valve Insulation Cover Type Valve Jacket For Fitting Type Valve Jacket Material Silicone Coated Fiberglass Cloth Insulation Material Fiberglass Mineral Wool Maximum Ambient Temperature 900 Degrees F Cover Width 6 in Cover Length 24 in Thickness 2 in Color Gray Fastening System Hook and Wire For Minimum Circumference 4 in For Maximum Circumference 6 in R Value 0.48 For Valve Type Universal Standards OSHA Compatible Fastener CR CRP LHW SSLW304 Market Industrial