chemicalresistant

Chemical resistance is the ability of a material, component, or surface to withstand exposure to chemical substances without substantial degradation of its physical properties, appearance, or performance.

Resistance depends on the chemical's nature (acids, bases, solvents, oxidizers), concentration, temperature, exposure duration, and mechanical stress. Degradation can include swelling, dissolving, cracking, crazing, softening, or loss of strength.

Materials with high chemical resistance include fluoropolymers such as PTFE, FEP, and PVDF; high-performance plastics like PEEK; ceramics and glass; certain metals and alloys with protective passivation; and protective coatings or linings. Elastomers vary by compound and formulation, with some offering good resistance to specific chemicals while remaining vulnerable to others.

Testing typically involves exposing materials to chemicals under specified conditions and observing changes in weight, dimensions, hardness, or mechanical properties. Standards and guidelines from organizations such as ASTM and ISO provide methods for evaluating chemical compatibility and performance in real-world service.

Applications span labware, chemical processing equipment, seals and gaskets, protective gloves, and linings for tanks, pipes, and storage containers. Selection often relies on compatibility data from manufacturers, chemical resistance charts, and consideration of operating temperature and exposure duration.

Limitations exist: no material is universally resistant to all chemicals. Performance can worsen with high concentrations, extreme temperatures, or prolonged exposure. Thorough evaluation of chemical type, concentration, and service conditions is essential for reliable material choice.