Recommended for determining efficiency of sanitization of containers, equipments, surfaces, water miscible cosmetics etc. Lecithin neutralizes quaternary ammonium compounds and polysorbate 80 neutralizes phenolic disinfectants, hexachlorophene, formalin and with lecithin ethanol. . The plates are gamma irradiated and triple packed . Available in scored plate for environmental monitoring, sterility checks by touch or contact method. Grids for easy counting.