THE DEVELOPMENT OF A STANDARD TEST METHOD FOR DETERMINING PERMEATION OF LIQUID CHEMICALS THROUGH PROTECTIVE CLOTHING MATERIALSBRITISH OCCUPATIONAL HYGIENE SOCIETY TECHNOLOGY COMMITTEE WORKING PARTY ON PROTECTIVE CLOTHING

Abstract
In recent years several techniques have been reported for quantifying the breakthrough time and permeation rate of chemicals through protective clothing materials. Although the basic principles in the majority of cases are similar, differences in procedure can mean that the results obtained using the various techniques are not comparable. A BOHS Technology Committee Working Party was formed to develop a standardized test method. The reasoning behind the agreed procedure is described and the results from a collaborative study are presented. As a consequence of the collaborative study the method was modified and a standard test cell was designed. The results indicated that reasonable inter-laboratory agreement could be achieved (relative standard deviation <20%) for breakthrough times of chemical/material combinations, if no significant interactions occurred, e.g. swelling and distortion of the membrane. The agreement in the amount permeating through the material was not as good but sufficient to assign materials into categories based on order of magnitude differences.
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