A customer from Indonesia in Dec. ,2014 called us and he was looking for some big size ( 2inch & 3inch) diaphragm pumps for their new chemical factory. Chemical liquid transportation, such as a mixture of surfactants and ammonium, Paraquat ( herbicide), ammonia liquid etc. After checking the concentration of liquid and working condition, we recommend that choose polypropylene (PP) pump material with Teflon diaphragm. He placed an order more than 10pumps from us and until now still good using, only need change some diaphragm spare parts.