CORKJOINT JOINTFLEX® Closed Cell Polyethylene Fillerboard is a closed cell, crossed linked, non-absorbent polyethylene expansion joint fillerboard for use in expansion and isolation joints in concrete and masonry structures. Jointflex® is non-absorbent and has excellent properties allowing it to be used in water retaining and excluding structures where potable, salt, chlorine and sewerage water is present. Has no bitumen content and joint sealant can be directly applied on top of it without the use of a bond-breaker tape. Jointflex® is available in standard 50kg/m³ (low) density and is also available in custom densities of 100kg/m³ (medium) and 150kg/m³ (high). Supplied in sheet form and at a thickness to suit the joint width or can be custom cut in sheet sizes to suit the concrete thickness or width. Also available upon request with a tear-off cap to suit the joint sealant application depth. Our website