Meaning
Atmospheric emissions originating from a polymer part as it releases specific chemical compounds into the surrounding air.
Emission Source
These gases originate from residual monomers, solvents, additives or the byproducts of thermal degradation during processing. Volatile organic compound emissions are a primary concern for interior automotive components where they contribute to fogging on windows and unpleasant odors. The concentration of these vapors is typically measured in parts per million or micrograms per gram of plastic.
In closed environments, these chemicals can accumulate to levels that affect air quality.
Grade Development
Suppliers provide low-emission grades of resins like polyoxymethylene and polyurethane to meet strict industry standards. Reducing volatile organic compound emissions often involves more intensive vacuum degassing during the resin manufacturing process. Heat stabilizers are added to prevent the polymer from unzipping at high processing temperatures.
These specialized grades typically carry a price premium over standard materials.
Testing Standard
Standardized chamber tests involve heating a part and sampling the air to identify specific chemical species. Results for volatile organic compound emissions are used to certify that a material is safe for use in sensitive environments like hospitals or vehicle cabins. These certificates are a mandatory part of the submittal package for Tier 1 suppliers.
