More D The choice of types and concentrations of reagents, duration of immersion or stress, or both, level of stress, temperature of the test, and properties to be reported are necessarily arbitrary. The specification of these conditions provides a basis for standardization and serves as a guide to investigators wishing to compare the relative resistance of various plastics to chemical reagents. For applications involving continuous immersion, the data obtained in short-time tests are of interest only in eliminating the most unsuitable materials or indicating a probable relative order of resistance to chemical reagents.
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Full Description 1. These practices include provisions for reporting changes in weight, dimensions, appearance, color, strength, and other mechanical properties. Standard reagents are specified to establish results on a comparable basis without precluding the use of other chemical reagents pertinent to specific chemical resistance requirements. Provisions are made for various exposure times, stress conditions, and exposure to reagents at elevated temperatures.
The type of conditioning immersion or wet patch depends upon the end-use of the material. If the material is used as a container or transfer line, immersion of the specimens is used.
If the material will only see short exposures or will be used in proximity and reagent will splash or spill on the material, the wet patch method of applying reagent to the material is used. Practice B differs from Test Method D, which seeks to quantify the susceptibility of ethylene plastics to environmental stress-cracking subjected to specific conditions, by measuring the proportion of specimens that crack in a given time.
The values given in parentheses are for information only. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific hazards statements are given in Section 7.
Evaluating the Resistance of Plastics to Chemical Reagents ASTM D Click on the picture for a larger view To request a quote for this test or others Click Here Scope: This test covers the evaluation of plastic materials for resistance to chemical reagents, simulating performance in potential end use environments. Chemical reagents can include lubricants, cleaning agents, inks, foods, or anything else that the test material may be expected to come in contact with. The test includes provisions for reporting changes in weight, dimensions, appearance and strength properties. Provisions are made for various exposure times, strain conditions and elevated temperatures.
ASTM D543 PDF
At least three specimens shall be used for each material being tested, for each reagent involved, for each length of conditioning, and for each strain level. The test specimens shall be as follows: 9. The cut edges of specimens shall be made smooth by sharp cutting, machining, or by finishing with No. Molding shall conform to conditions recommended by the manufacturer of the material see Note 2. The shape and dimensions of specimens shall depend upon the test to be performed and shall conform to the following: 9. The nominal surface area of this standard disk is Where the determination of other mechanical properties is agreed upon between the seller and the purchaser, standard specimens prescribed in the appropriate test methods shall be used.
Evaluating the Resistance of Plastics to Chemical Reagents
Barr For applications involving continuous immersion, the data obtained in short-time tests are of interest only in eliminating the most unsuitable materials or indicating a probable relative order of resistance to chemical reagents. The type of conditioning immersion or wet patch depends upon the end-use of the material. Work Item s — proposed revisions of this standard. Prior to ASTM D testing specimen coupons were tested in the device using a strain gauge bonded to the bottom of the specimen coupon. Specimens can be weighed and measured prior to contact with the chemical reagent.
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