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Resistance to chemical agents

Evaluating the resistance of plastics to chemical substances is crucial to ensure their durability and performance throughout their use.

ENAC ISO 17025

Staining and chemical resistance tests are used to evaluate the behaviour of thermosetting plastics and thermoplastics when in contact with chemical agents and petroleum products.

Resistance to chemical agents and petroleum products

In these tests, the sample is subjected to the action of a liquid (fuel) in its liquid and vapour phases and, after the treatment, the mechanical properties (tensile and flexural) of the original sample are compared with the one tested, as well as the variation in mass and appearance of the samples. The evaluation will depend on the corresponding standard or on the agreement between the parties as to how much the mechanical properties should diminish or the absence of changes in the appearance of the material. The typical liquids used are solvents, gas oils, and liquids used in the automotive sector (oils, cleaning liquids, etc.).

Resistance to staining

The test products are exposed to different chemical agents and substances commonly used in different sectors (construction, automotive, furniture) under varying weather and environmental conditions, to verify the surface effect they have when they come into contact with plastic products.


At AIMPLAS, we carry out different chemical resistance tests, some of which are accredited by ENAC, such as:

  • Plastics. Determination of chemical resistance of glass reinforced plastics. (UNE 53316).
  • Glass reinforced plastic tanks, in the air or in hold, for storaging fuel-oil.  (UNE 53496-1, UNE 53496-1).
  • Underground tanks of glass-reinforced plastics (GRP) (UNE-EN 976-1, UNE-EN 977).
  • Plastics. Repairing and internal covering of metallic tanks, used for the storage of liquid fuel, with reinforced plastics. (UNE 53991 IN, UNE 53316).

Preguntas frecuentes

What is chemical resistance?

Chemical resistance is the ability of a material to remain unchanged, not to degrade, and therefore not to lose its physical and mechanical properties when in contact with an aggressive medium.

How can chemical resistance be assessed?

By visually analyzing the material in contact with the medium, as well as evaluating changes in physical, mechanical properties, etc.

Your tests with full guarantees
Tests accredited by ENAC

AIMPLAS has the highest number of tests accredited by ENAC (Spanish National Accreditation Body) for plastics according to the UNE-EN ISO/IEC 17025 standard in Spain.

We accompany you throughout the entire process

We provide added value to our clients through a close relationship, advice on the interpretation of results and the preparation of clear and understandable reports.

Experience and know-how

AIMPLAS ensures the best results and quality for its clients so that companies can guarantee the reliability of their products or services