1-3/8″ ID x 3/8″ Wall Thickness. 6 Foot Lengths. Fits 1-1/4″ CTS, 1″ IPS. R Factor: 2.1. Flame Spread Rating & Smoke Rating: 25/50. Will Not Contribute Significantly To Fire. Thermal Conductivity – 75°F (24°C) Mean Temp: .27, 120°F (49°C) Mean Temp: .295 . Water Vapor Transmission: <.05. This Insulation Meets: ASTM C1427 (Type I, Type II), ASTM C411, ATSM C177 or C518, ASTM E96, ATSM C209, ATSM C1427, ATSM E84, CDPH Standard Method v1.2, ATSM G21, UL 181, ATSM C1304, ATSM C665, ATSM D1171, NFPA 90A-90B.
