AP/ArmaFlex are flexible insulation products that reliably protects against water vapour ingress due to its closed-cell structure. No additional water vapour retarder is required, for most applications. --AP/ArmaFlex is manufactured using nitrile rubber and polyvinyl chloride (NBR/PVC) formulations for insulation thickness up to and including one-inch wall thickness. --AP/ArmaFlex FS insulation and pipe insulation in 1 1/2 and 2" wall thicknesses are manufactured using Ethylene Propylene Diene Monomer (EPDM) formulations. --Available in Tube/Sheet/Roll.