Armaflex is a flexible, closed cell, elastomeric, nitrile rubber professional insulation system engineered to prevent condensation and effectively prevents energy loss. Armaflex offers a built-in anti-microbial protection that reduces mould and bacteria growth and also has a built in vapour barrier to prevent condensation. Please note this product is available both slit and un-slit, please specify which option you would like in the 'special instructions' section of the checkout process. Properties Length: 2m. Pipe size: 42mm. Wall thickness: 13mm. Lengths per pack: 28x lengths. Pack coverage: 56m. Thermal conductivity: 0.034 W/mK at 0C. 0.036 W/mK at 20C. 0.038 W/mK at 40C. Surface spread of flames: Class 0. Fire performance: Class 1. Material: foamed nitrile rubber. Noise reduction: sound absorption coefficient ISO 354:2003.