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Significance and Use
5.2 The breakthrough detection time, standardized breakthrough time, permeation rate, and cumulative permeation are key measures of the effectiveness of a clothing material as a barrier to the test chemical. Such information is used in the comparison of clothing materials during the process of selecting clothing for protection from hazardous chemicals. Long breakthrough detection times, long standardized breakthrough detection times, low amounts of cumulative permeation, and low permeation rates are characteristics of better barriers.
5.3 The sensitivity of the test method in detecting low permeation rates or amounts of the test chemical that permeate is determined by the combination of the analytical technique and collection system selected, and the ratio of material specimen area to collection medium volume or flow rate.
5.3.1 The analytical technique employed should be capable of measuring the concentration of the test chemical in the collection medium at, or below, levels consistent with the standardized breakthrough time value specified in 3.1.13 and at, or above, the steady-state permeation rate.
5.3.2 Often permeation tests will require measurement of the test chemical over several orders of magnitude in concentration, requiring adjustments in either the sample collection volume or concentration/dilution, or the analytical instrument settings over the course of the test.
5.3.3 Higher ratios of material specimen area to collection medium volume or flow rate permit earlier detection of breakthrough and detection of lower permeation rates and levels of cumulative permeation because higher concentrations of the test chemical in the collection medium will develop in a given time period, relative to those that would occur at lower ratios.
5.4 Comparison of results requires specific information on the test cell, procedures, and analytical techniques. Results obtained from closed-loop and open-loop testing may not be directly comparable.
5.4.1 The sensitivity of an open-loop system is characterized by its minimum detectable permeation rate. A method for determining this value is presented in Appendix X1.
5.5 A group of chemicals for use in permeation testing is given in Guide F1001.
5.6 These test procedures are also a part of ISO 6529. ISO 6529 provides a harmonized standard that also permits using some practices commonly followed in Europe for permeation testing, for example, using a breakthrough time normalized at a permeation rate of 1.0 µg/cm2/min instead of 0.1µg/cm2/min as used in this method. For this reason, the reporting of all permeation data must include the method that is used in the testing. Guide F1194 provides guidance on reporting permeation test results.
1.2 This test method is designed for use when the test chemical is a gas or a liquid, where the liquid is either volatile (that is, having a vapor pressure greater than 1 mm Hg at 25°C) or soluble in water or another liquid that does not interact with the clothing material.
1.3 Values states in SI units are to be regarded as standard. Values given in parentheses are not exact equivalents and are given for information only.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Specific precautionary statements are given in Section 7.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D471 Test Method for Rubber Property--Effect of Liquids
D543 Practices for Evaluating the Resistance of Plastics to Chemical Reagents
D751 Test Methods for Coated Fabrics
D1777 Test Method for Thickness of Textile Materials
E105 Practice for Probability Sampling of Materials
E171 Practice for Conditioning and Testing Flexible Barrier Packaging
E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
F903 Test Method for Resistance of Materials Used in Protective Clothing to Penetration by Liquids
F1001 Guide for Selection of Chemicals to Evaluate Protective Clothing Materials
F1194 Guide for Documenting the Results of Chemical Permeation Testing of Materials Used in Protective Clothing
F1383 Test Method for Permeation of Liquids and Gases through Protective Clothing Materials under Conditions of Intermittent Contact
F1407 Test Method for Resistance of Chemical Protective Clothing Materials to Liquid Permeation--Permeation Cup Method
F1494 Terminology Relating to Protective Clothing
F2815 Practice for Chemical Permeation through Protective Clothing Materials: Testing Data Analysis by Use of a Computer Program
ISO StandardISO6529 Protective Clothing--Determination of Resistance of Protective Clothing Materials to Permeation by Liquids and Gases Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
ICS Number Code 13.340.10 (Protective clothing)
UNSPSC Code 53100000(Clothing)