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How to Evaluate the Resistance of Plastics to Chemical Reagents Using ASTM D543-06
Plastics are widely used in various applications that may expose them to different chemical reagents. To ensure the durability and performance of plastics, it is important to evaluate their resistance to chemical reagents using standardized methods. One of these methods is ASTM D543-06, which covers the evaluation of all plastic materials including cast, hot-molded, cold-molded, laminated resinous products, and sheet materials for resistance to chemical reagents.
ASTM D543-06 includes provisions for reporting changes in weight, dimensions, appearance, and strength properties of plastics after exposure to chemical reagents. Standard reagents are specified to establish results on a comparable basis. Provisions are also made for various exposure times, stress conditions, and exposure to reagents at elevated temperatures. The type of conditioning (immersion or wet patch) depends on the end-use of the material. If the material is used as a container or transfer line, specimens should be immersed. If the material will only see short exposures or will be used in close proximity and reagent may splash or spill on the material, the wet patch method of applying reagent should be used.
The effect of chemical reagents on other properties of plastics should be determined by making measurements on standard specimens for such tests before and after immersion or stress, or both, if so tested. The values stated in SI units are to be regarded as standard. The values given in brackets are for information only.
To download a PDF version of ASTM D543-06, you can visit one of these web sources[^1^] [^2^] [^3^]. However, please note that these sources may not be authorized or updated by ASTM International. For the most accurate and reliable version of ASTM D543-06, you should purchase it from the official ASTM website at https://www.astm.org/Standards/D543.htm.
ASTM D543-06 specifies a list of standard reagents that represent the main categories of pure chemical compounds and mixtures. These reagents include acids, bases, alcohols, ketones, esters, ethers, hydrocarbons, halogenated hydrocarbons, and water. The concentration and purity of the reagents should be as specified in the standard or as agreed upon by the parties concerned. The reagents should be stored in glass containers and protected from light and moisture.
The specimens for testing should be representative of the material to be evaluated and should conform to the dimensions and shape specified in the standard or as agreed upon by the parties concerned. The specimens should be conditioned in accordance with ASTM D618 before testing. The specimens should be weighed and measured before and after exposure to the reagents. The weight change and dimensional change should be calculated and reported as percentages. The appearance and strength properties of the specimens should also be examined and reported.
The exposure of the specimens to the reagents can be done by either immersion or wet patch methods. The immersion method involves immersing the specimens in a container filled with the reagent at a specified temperature and time. The wet patch method involves applying a wetted filter paper or cloth patch containing the reagent to one surface of the specimen at a specified temperature and time. The specimens should be rinsed with water and dried after exposure to the reagents. a474f39169