SEAL & FLEX is THE solution for airproofing and waterproofing windows. Specifically designed to be BBC RT 2012-compliant. This allows an optimum yield from the aerosol: 750ml = 175 linear meters' worth of 10mm joint.SEAL&FLEX is extremely effective in terms of its airproofing and waterproofing properties. Even when cut, the foam's effectiveness is unaffected. The foam maintains its flexibility and will not warp the bases.SEAL&FLEX is an insulating material with a lambda of 0.035 and reduces acoustic effect by 60dB.