Chemical resistance
Description (definition)
Chemical resistance describes the ability of a material to withstand chemical substances such as acids, bases, solvents or oils without changing or degrading its properties. It is a decisive factor in the selection of materials for applications that come into contact with aggressive chemicals, for example in the chemical, automotive or construction industries. Plastics such as PTFE (Teflon) or PVDF are characterized by particularly high chemical resistance.
Example
A typical example is the use of PTFE in seals and pipelines in chemical plants. The material remains stable even in contact with concentrated acids or alkalis and guarantees a long service life.
Why is chemical resistance important?
Chemical resistance is crucial to ensure the functionality and safety of components in environments with aggressive substances. Without sufficient resistance, materials could corrode, become brittle or even fail, which can lead to production downtime or hazards.
How is the chemical resistance of a material tested?
Materials are tested using standardized tests such as storage in certain chemicals at defined temperatures and for defined periods of time. Changes in weight, structure or mechanical properties provide information about resistance. These tests are often carried out according to standards such as ISO or ASTM.
Which materials are particularly resistant to chemicals?
Materials such as PTFE, PVDF, PEEK and polypropylene (PP) are considered to be extremely resistant to chemicals. They are used in demanding applications such as chemical plants, medical devices or tanks. The choice depends on the specific chemicals and operating conditions.