Chemical Compatibility ASTM D543

Plastic materials are widely used in various applications and are often exposed to different chemical substances during their use. To ensure their performance in these environments, the resistance of plastic materials to chemical reagents is evaluated through the ASTM D543 test.

The test evaluates the plastic material's resistance to various chemical reagents such as lubricants, cleaning agents, inks, and foods that the material may come into contact with during use. The test covers the evaluation of changes in weight, dimensions, appearance, and strength properties of the plastic material.

Multiple specimens are used for each material/chemical/time/strain condition, typically at least five. Before contact with the chemical reagent, specimens can be weighed and measured. To simulate end use stress in the test samples, strain jigs designed for ASTM izod bars or ASTM Type I tensile bars are used. Exposure to the chemical agent can be through immersion, wipe, spray, or saturated gauze, depending on the type of contact anticipated for the test sample. The test samples are then sealed in a container and placed in an oven or left at room temperature for a specified time.

After the agreed-upon period of time, the specimens are removed and evaluated for changes in weight, appearance, and physical strength properties such as tensile strength and elongation. Reports often include visual evidence of decomposition, swelling, clouding, crazing, cracking, and/or change in physical properties such as tensile strength and elongation.

The test helps to simulate the plastic material's exposure to chemical reagents during use and provides data on the material's resistance to the specific chemical. This information can be used to optimize material selection for specific applications, ensuring that the plastic material is fit for purpose and can perform effectively in the end-use environment.