Sigma GP Titan Bond is our all-encompassing membrane, protecting against both ground gases and VOCs in accordance with BS8485:2015 and water ingress in accordance with BS8102:2009. Titan Bond is a pre-applied membrane which incorporates Sigma GP Titan Flex and a heavy-duty virgin polypropylene geotextile. The two materials are laminated together and the geotextile creates an integral bond to poured concrete.