... machine used 3,Liquid 669 Hydrophilic Single Liquid Type PU Foaming AgentProduct DescriptionPu foaming agent: Single-liquid model, simple construction, hydrophilic, when ... , swelling coefficient reaches 12 times, if swelling has not been complete, make it go through water to produce swelling for the ... water, sea water, waste water and so on. 669 Hydrophilic Single Liquid Type PU Foaming Agent