Compounds of consistently high quality and reliable customer service are decisive criteria for our customers. That is why we at KRAIBURG place high importance on extensive expertise and competence.

We guarantee constant quality monitoring to ensure that the customer receives “tested safety” with the purchase of KRAIBURG compounds. This is achieved for example by regular internal and external audits, in addition to certifications.

Sustainable use of raw materials

The EU chemicals directive no. 1907/2006 on the registration, evaluation, authorization and restriction of chemicals requires the registration of all chemical substances.REACH (Registration, Evaluation, Authorization and Restriction of Chemicals), which has been in effect since June 1, 2007, is the EU chemicals directive no. 1907/2006 that was issued in order to improve the protection of human health and the environment against potential risks from chemicals and also to increase the competitiveness of the chemical industry in the European Union. It applies to the registration, evaluation, authorization and restriction of chemicals and requires the registration of all chemical substances.In principle, REACH applies not only to chemical substances used in industrial processes, but to all chemicals, including those we encounter in daily life, such as in cleaning products, paints and other products.

The directive therefore affects most companies throughout the EU.Non-vulcanized rubber compounds are preparations that are not subject to registration. We at KRAIBURG test all raw materials for compliance with REACH, watch out for and consistently avoid the use of potentially harmful substances and, if available, use harmless substances. This ensures the sustainable availability of our products. Our suppliers and customers receive information regarding the substances we use and their safety is ensured by means of separate substance safety reports.

KRAIBURG quality is defined by numerous parameters. They include much more than just the quality of the raw materials and the processing technology. One of the most important influencing factors is the manufacturing process, which is controlled by man and machine. It is decisive for the success of our customers and of KRAIBURG.

Consistent quality

Our management system is regularly certified according to the following standards:

Did you know?

Rubber is not a material in the normal general sense. It is a base substance, to which various components are added prior to vulcanization. In addition to the base material, all rubber compounds contain numerous additives in the form of softeners, processing aids, anti-aging agents, pigments, etc. An elastomer compound generally consists of 10 to 20 components. Only then is it referred to as a rubber compound.

From A to Z: KRAIBURG quality

The combination of cost effectiveness and quality points the way for the future of an enterprise. In the case of elastomer compounds it is immensely important that the compounds meet the requirements for ever new areas of application, in addition to maximum requirements for the particular component. Highly consistent quality is a factor of increasing importance. The right selection and execution of suitable test and research methods is decisive in this regard. To meet the increasing quality requirements implies a modern test technology that has to be continuously optimized.

The quality of KRAIBURG products is defined by numerous parameters. They include the quality of the raw material as well as the processing technology used in the manufacture of the compounds. The large number of compound and process parameters results in a corresponding variance in the compound quality. This means that the creation of quality characteristics for compounds is largely dependent on statistical and empirical evaluations. This can be achieved only with a well-equipped test lab for development and product monitoring.

Modern, efficient test methods, well-founded tests and their correct evaluation lead to the knowledge that is necessary for the optimization and further development of formulations (compounds). The tests and test methods used at KRAIBURG in most cases are based on DIN (German Institute for Standardization), DIN ISO and DIN EN-ISO. Test methods of the American Society for Testing and Materials (ASTM) are also used. In addition, the company uses in-house test procedures for requirements where the test characteristics are not described in any standard, or product- and application-specific tests are conducted in coordination and cooperation with the customer. An overview of the most important test methods used at KRAIBURG is provided here.

Geprüfte Qualität
Laborgerät bei Gummiwerk KRAIBURG

Overview of the most important test methods and equipment

Physical and chemical tests

  • Thermal analysis
  • Surface measurement
  • Particle size distribution
  • Cleveland flash point test
  • Density measurement
  • FTIR spectroscopy and many more

Physical and technical testing

  • Universal test machine for tear strength, elongation and tensile stress
  • Hardness tester
  • Rebound resilience test
  • Ozone cabinets for determining resistance
  • Abrasion test
  • Compression relaxation


  • Mooney viscometer for viscosity, scorching behavior and relaxation behavior
  • Curemeter for the cross-linking behavior of the compound

Processing behavior and vulcanization

  • Rheovulk parameters
  • Rubber Process Analyzer (RPA)

High testing quality in the laboratory at Gummiwerk KRAIBURG

In order to guarantee that our test results are valid and usableour laboratory regularly participates in so-called round robin tests and achieves very good to good quality. The test quality of our laboratory is ascertained by independent institutions with the help of such tests. Here, an identical sample is sent to multiple laboratories which should analyse it under specified conditions. The round robin tests offer us the opportunity to identify factors which can affect the quality of our analyses in good time and discover possible errors – in the performance of analyses, for example. 

We thus guarantee the impeccable quality and reliability of the analysis we perform for our customers.