ClosedCell Rubber Tube Insulation, Unslit, Length 1.83, Temp. Range -50 ... ID. 6 to 89mm, thickness 6 to 30m Closed Cell Rubber Tube Insulation, Unslit, Length 1.83, Temp. Range -50 to ... 6 to 89mm, thickness 6 to 30m HengBao Insulation Tube is a flexible, closed cell and light weight elastomeric ... construction, hospitals, hotels and cold storage industries. Closed Cell Rubber tube lnsulation black color