How do you test the chemical resistance of bench finishes?

Testing the chemical resistance of bench finishes is crucial for ensuring durability in laboratories, workshops, and industrial settings. The process typically involves controlled exposure to chemicals followed by systematic evaluation. Begin by selecting test chemicals relevant to your environment - common choices include acids (hydrochloric, sulfuric), bases (sodium hydroxide), solvents (acetone, ethanol), and common disinfectants. Prepare samples of the finished surface, ensuring they represent the actual application conditions. Apply small droplets of each test chemical to the surface, covering with watch glasses to prevent evaporation. After specified exposure times (usually 24 hours), wipe clean and examine for changes. Evaluate results using standardized rating systems, typically assessing visible changes like discoloration, softening, swelling, or gloss reduction. For quantitative data, measure hardness changes with pencil or scratch tests. Always follow ASTM D1308 or ISO 2812 standards for consistent methodology. Document all observations with photographs and detailed notes. Proper chemical resistance testing ensures your bench finishes withstand real-world conditions, maintaining both functionality and appearance over time.