New testing of recyclates according to DIN SPEC 91446

The use of recycled plastics is the cornerstone of a functioning circular economy. The clear labeling of recyclates and recycled content of plastic materials is essential. Since June 2021, the new DIN SPEC 91446: 2021-06 standard has provided comprehensive specifications on data quantity and quality for material classification. According to this standard, recyclates can now also be tested in the accredited testing laboratory of the KUZ.

In order to effectively avoid downcycling or cascading, i.e. the reuse of recycled plastics for lower-value applications, a defined and consistent quality of the recyclates is required. The DIN SPEC 91446 standard defines four data quality levels (DQL) for characterizing recyclates. The number of parameters to be characterized increases from DQL 1 to DQL 4. A material tested according to DQL 4 is thus better defined than a material certified according to DQL 1-3.

The accredited testing laboratory of the KUZ now offers the certification of recyclates according to the data quality levels (DQL) 2, 3 and 4 of DIN SPEC 91446. The KUZ team uses mechanical, rheological, spectroscopic and materials testing methods to precisely define the recyclate samples to be tested. Dr. Christian Schurig, head of the accredited testing laboratory at KUZ, emphasizes:


'We are pleased to support companies in characterizing their materials and thus help shape the industry's transformation towards a more sustainable circular economy.

Portfolio Plastics Testing

KUZ offers its customers a comprehensive range of services in the accredited field. This includes mechanical, thermal, rheological, electrical, optical and environmental simulation testing. In addition to standardized tests, special tests are also carried out, particularly in interaction with questions of process engineering and component design. In addition to the proven methods of the accredited testing laboratory, further testing techniques are available for failure analysis. For experimental investigations to obtain information on the damage process, intensive analysis can be performed using microscopy, FTIR spectroscopy, thermal analysis as well as rheology and viscometry. For non-destructive component testing, investigations using computed tomography can be used.

Overview plastics testing laboratory




Dr. Christian Schurig
+49 341 4941-800

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