Hydrolysis resistance
Description (definition)
Hydrolysis resistance describes the ability of a material to maintain its properties when in contact with water or water vapor over long periods of time. Materials with high hydrolysis resistance resist chemical degradation processes caused by hydrolytic decomposition and are particularly important in environments with high humidity, temperature and direct contact with water. This property is crucial for engineering plastics used in the automotive, medical technology and chemical industries.
Example
A typical example is polybutylene terephthalate (PBT), which is used in automotive cooling systems. Thanks to its resistance to hydrolysis, the material remains stable even when exposed to moisture and heat for long periods.
Why is hydrolysis resistance important?
Hydrolysis resistance is crucial to ensure the longevity and functionality of materials in humid and hot environments. Without this property, plastics can become brittle, lose strength and fail due to chemical degradation processes.
Which plastics are resistant to hydrolysis?
Plastics such as polyether ether ketone (PEEK), polybutylene terephthalate (PBT) and thermoplastic polyurethanes (TPU) are known for their high resistance to hydrolysis. They are used in applications where permanent exposure to moisture or water vapor is expected.
How is hydrolysis resistance tested?
Hydrolysis resistance is tested by accelerated ageing tests in which materials are exposed to high humidity and heat over long periods of time. Mechanical and chemical properties such as strength, elasticity and molecular structure are compared before and after the test.