Post-Consumer Recyclate Quality Assurance Protocol Selection
Verify post-consumer resin lot conformity by combining core lance sampling, melt flow shear sweeps, and DSC purity screens before unloading silos.
VDA 270
Meaning
Standard test method developed by the German Association of the Automotive Industry to evaluate the odour emission behaviour of materials used in vehicle interiors. Complying with VDA 270 is a mandatory requirement for polymer suppliers and moulders who sell components to European automotive brands. This standard assesses how heat and humidity affect the release of volatile organic compounds that cause unpleasant smells.
The evaluation is conducted by a trained sensory panel using a scale from one to six.
Testing Chamber
Samples of the moulded plastic are placed inside sealed glass flasks and subjected to specific temperature and humidity profiles. The standard defines several test conditions, such as storing the sample at eighty degrees Celsius for two hours to simulate a car parked in the sun. Once the heating cycle is complete, the flasks are allowed to cool to sixty degrees Celsius before being presented to the assessors.
This controlled environment ensures that the odour concentrations are repeatable and comparable across different test laboratories.
Sensory Rating
The panel of assessors sniffs the air from the heated flasks and assigns a score based on the perceived intensity. A score of one indicates an imperceptible odour, while a score of six represents an intolerable or offensive smell. Most automotive manufacturers require interior parts to achieve a score of three or lower to be approved for production.
This subjective yet standardized test remains the primary tool for interior comfort.
Polymer Formulation
Moulders must pay close attention to their raw material formulations to pass this demanding automotive test. Certain additives, flame retardants, and processing aids can release volatile compounds when heated, causing a failing score. To prevent this, compounders use low-emission grades of resins, such as specialized polypropylene or polyurethane, that have been stripped of residual monomers.
Moulders must also avoid over-heating the polymer during the injection cycle, as thermal degradation can generate new odorous compounds. Running clean, well-vented moulds and using virgin materials are standard practices for meeting the requirements of this specification. Passing this test is essential for securing supply contracts with major automotive manufacturers.