... machine used 3,Liquid 669 Hydrophilic Single Liquid Type PU Foaming AgentProduct DescriptionPu foaming agent: Single-liquid model, simple construction, hydrophilic, ... injecting the crack in the hydraulic type of groundwater flow, can be together with the catalyst. After that, it ... 3 seconds and be fully expanded & solidified after mixing with water for 2 minutes.Features1.When going through water, ...