HydroBloc PU 640 is a high speed resin for adhesive anchors. Anchor bonding is easy with 2-step reaction. The first step develops directly after mixing, the material turns into a thixotropic, stable paste with excellent pumping abilities. In step two, the resin turns into a very hard polyurethane plastic with excellent adhesion to all substrates. The slight expansion of the resin supports the adhesion of the anchor additionally.