NBR Thermal Insulation Tubes is black in color, fire retardant, and multi-purpose flexible elastomeric thermal insulation available in tubular lengths, and pre-slit tubular lengths with internal diameter from 6mm up to 165mm and with wall thickness of 6mm, 9mm, 13mm, 19mm, 25mm, 32mm, 38mm, 50mm TK. For other sizes. Tubes are FM approved to deliver continuous improvements in quality, technical integrity, and outstanding performance in demanding environments. Aero foam® NBR Tubes meet the strictest safety and fire resistance standards. Aero foam® NBR FM approval applied on the outside of non-combustible pipes or ducts enhances customer confidence in the brand further.