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Chemical protective clothing standard test method development: part II. Degradation test method.
Coletta-GC; Mansdorf-SZ; Berardinelli-SP
Am Ind Hyg Assoc J 1988 Jan; 49(1):26-33
Tests were conducted to evaluate the proposed American Society for Testing and Materials (ASTM) degradation test method and to recommend changes which would improve the method. The method as proposed provided for an initial screening for chemical protective clothing materials. This was the first in a triad of tests designed to determine resistance to degradation, resistance to penetration, and resistance to permeation. The test method called for measuring the thickness, weight, and elongation of fresh specimens of the candidate material that had not contacted the liquid chemical under study; measuring these properties of specimens that had been in contact with the test liquid; and comparing the results of the two measurements. Materials tested included polyvinyl-alcohol, polyvinyl-chloride, Neoprene, butyl, and Tyvek, and the test liquids were water, toluene (108883), methyl-ethyl-ketone (78933), hexane (110543), and hydrochloric-acid (7647010). Data from the seven laboratories completing the study indicated wide variability in all statistical parameters, with standard deviations well above generally accepted values for standardized testing. For thickness measurements, various approaches were used, leading to differing results. Weight measurements varied due to lack of specific directions, inconsistent drying, difficulty in specimen handling, and inconsistency as to whether only the contaminated section or the whole material sample was weighed. Specific difficulties arising from unclear instructions for elongation measurements were also noted. The authors conclude that the method is presently unacceptable, but that it does appear valuable because it permits the measurement of important physical properties, is relatively easy to perform, and does not need costly apparatus or manpower. Recommendations to make the results more comparable between laboratories were listed.
NIOSH-Author; Personal-protective-equipment; Protective-clothing; Screening-methods; Laboratory-testing; Materials-testing; Physical-properties; Testing-equipment
108-88-3; 78-93-3; 110-54-3; 7647-01-0
Issue of Publication
American Industrial Hygiene Association Journal
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division