The 2 inch cell and the smaller 1 inch cell were validated by ASTM by inter-laboratory testing and provide chemical resistance data on clothing materials. The cell is used to measure both the breakthrough time and permeation rate of a liquid or gas through a barrier material. Producers of protective clothing use the permeation test cell to report on the performance of their products against various chemicals. Chemical resistance guides are published which help users of protective clothing select the most resistant glove, suit or boot.