Flo-Add HFPC Hydrogen free expansive grout additive You might also be interested in Flo-Add 2 Hydrogen free expansive and plasticising grout admixture Flo-Add 1 Expansive and plasticising grout admixture Flo-Add UW Expansive, plasticizing and Anti-wash admixture for cementitious grout Flo-Add LV Low viscous superplasticising shrinkage compensating grout admixture