... pressure grouting machine used 3,Liquid 669 Hydrophilic Single Liquid Type PU Foaming AgentProduct DescriptionPu foaming agent: Single-liquid model, ... , cement.), into the layer which can seal and cracks in the wall, swelling coefficient reaches 12 times, if swelling has ... sealing3.Filling wed joint cracks4.When injecting the crack in the hydraulic type of groundwater flow, can be together with the ...