Rooftec Poly-Guard PU Joint Sealant is a low modulus expansion joint sealant. It displays excellent thixotropy allowing it to be used in very large expansion joints. Cures by atmospheric reaction to produce a joint sealant with a 50% movement accommodation factor with excellent adhesion on substrates traditionally problematic for PU sealants including glass, aluminium, steel and polycarbonate, etc. The extrusion rate and tooling of the sealant remain the same throughout a very wide range of temperature and humidity conditions.