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Property 1)excellent fire resistance properties when fire tested,K-FLEX achieve the fire performance requirement of class 1 to British standard BS476 Part 7 1997 and the requirement of B1 to Chinese standard GB8624-1997. 2)high water vapour diffustion resistance K-FLEX closed cell elastomeric insulation has a high water vapour diffusion resistance factor that minimizes water vapour penetration,giving excellent long term performance. 3)very low thermal conductivity K-FLEX thermal conductivity factor =0.035W/(m.K),The thermal conductivity coefficient is the most important factor in calculation focused on energy saving.