Laboratory testing and quality control: which tests are performed
The reliability of rubber and elastomer products is determined not only at the formulation and production stage, but by the confirmation of each batch through laboratory testing. NUR KAUÇUK LLC checks both raw materials and finished products against standards in its own in-house laboratory. In this article we explain which tests are carried out and what they reveal.
Why laboratory control matters
Two seals with identical appearance can show completely different service lives. Only measured parameters reveal the difference. Thanks to the in-house quality control system, a defective batch is detected before it reaches the customer and the processing is corrected.
Mechanical tests
Hardness (Shore A/D)
Hardness is measured with a durometer and indicates the material's resistance to deformation. A target range is set for each formulation; a deviation signals a problem in the vulcanisation regime. You can read more about the Shore scale in the article what is Shore hardness.
Tensile and elongation
The specimen is stretched until it breaks; tensile strength (MPa) and elongation at break (%) are recorded. These indicators confirm that the compound has been prepared correctly and has the required elasticity.
Tear resistance and compression set
The compression set test is especially critical for seals: the specimen is compressed for a defined period, then its recovery capability is measured. Low compression set means long-lasting sealing.
Ageing and environmental tests
- Heat ageing — the specimen is kept in a heated chamber, then the change in its properties is measured.
- Ozone and UV tests — important for outdoor use; this is where EPDM's advantage shows.
- Environmental (oil, chemical) resistance — the specimen is kept in a liquid, and the change in mass and volume is recorded.
Dimensional and visual control
The cross-section of profiles and seals is checked with a template, and the dimensions with calibrated instruments. Surface defects, blisters and cracks are assessed visually. Throughout our production process, samples are taken regularly so that any deviation is caught at an early stage.
Documenting the results
Each test is recorded in a protocol, thereby ensuring the traceability of every batch. These documents prove both production stability and compliance with customer requirements.
If you need rubber and EPDM solutions whose quality you can trust, explore our product range and for your specific requirements get in touch with us — we will prepare an offer backed by laboratory results.