Short Description: ASTM D543 is used for assessing the Resistance of Plastic Materials to Chemical Reagents including petroleum products, dyes, food items, cleaning agents, and specialized chemicals as per the requirement. Changes in appearance, dimensions, weight, and strength properties are evaluated and reported.
ASTM D543 test to evaluate Chemical Compatibility is designed to gauge the resistance of plastic materials against chemical reagents. ASTM D543 test covers all cast, cold- and hot-molded, laminated resinous, and sheet plastic materials. The test environment is designed to simulate the application conditions of the plastic material. Chemical reagents include petroleum products and lubricants, dyes and inks, food items, cleaning agents, specialized chemicals, and other specific chemicals as per the requirement. Chemical compatibility test by ASTM D543 reports changes in appearance, dimensions, weight, and strength properties such as tensile strength and elongation upon exposing the samples for different time durations, strain conditions, and elevated temperatures.
At least five specimens of a material are tested in a given set of chemical, time, and strain conditions. The specimen is first weighed and measured for its initial dimensions and then exposed to the chemical. The type of chemical exposure—wipe, spray, saturated gauze, or immersion—is designed to mimic the extent of chemical contact a sample is supposed to encounter in real-life conditions. For example, the wipe method is used when the sample is supposed to have sparse contact with the chemical like splash or spill. The immersion method is used when a sample holds the chemical as a container or a pipeline. Next, the test specimens are sealed in a container and kept at either room temperature or elevated temperature in an oven. Strain jigs designed for ASTM Type I tensile bars or ASTM Izod bars are used for the stress test of samples. This is to simulate the stress likely to be encountered by the specimen in end-use conditions. Finally, the specimens are removed from test conditions after a pre-fixed duration and evaluated for appearance, weight, and tensile properties. Compared to the initially recorded data, the change is noted and compared with data obtained from experiments set up with control samples. The values are stated in SI units.
Specimens may be taken as tensile bars, disks, or flex bars according to suitability and availability.
Results of the Chemical Compatibility ASTM D543 test are reported in terms of the changes in physical appearance (clouding, swelling, cracking), decomposition, change in weight due to chemical corrosion, and change in elongation properties and tensile strength.