Insul-Tube® 6'L, 3/4" Wall Thickness, 3/8" Nom.I.D.INSUL-TUBE® is used to retard heat gain and prevent condensation or frost formation on refrigerant lines, cold water plumbing, and chilled water systems. It also retards heat flow for hot water plumbing, liquid heating, dual temperature piping, and many solar systems. Designed for the HVAC and Refrigeration industry. INSUL-TUBE® is non-porous, non-fibrous. ASTM C 534 Type 1 (Tubing) Grade 1, ASTM D 1056-00-2C1 New York City MEA 186-86-M Vol. IV USDA Requirements. UL 94-5V Flammability Classification (Recognition No. E300774) ASTM E 84 2" 25/50-tested according to UL 723 and NFPA 255 Complies with requirements of CAN/ULC S102 03. FMRC Approval Guide Chapter 14 Pipe Insulation. NFPA No. 101 Class A Rating. Meets requirements of NFPA 90A Sect. 2.3.3 for Supplementary Materials for Air Distribution Systems. Meets requirements of ASTM C 411 (Test Method for Hot Surface Performance of High Temperature Thermal Insulation). Meets requirements of UL 181 sections 11.0 and 16.0