The principle is therefore similar to when consumers buy “green” or “clean” electricity. Although the consumers cannot be certain that the electricity they use in their homes has come directly from renewable sources, the overall share of green energy in the grid rises in step with demand. In the chemical industry, renewable or recycled feedstock is added at the beginning of the production process and allocated to the end product. This calculation-based principle offers multiple advantages: It reduces greenhouse gas emissions and fossil feedstock inputs, while the quality and properties of a product remain the same. As a result, the products can be processed exactly like conventionally produced materials. There is therefore no need to adapt formulations, plants or processes. And customers who buy mass-balanced products can use them as they would traditional products, while benefiting from the same level of quality.
Independent bodies audit the allocation (i.e., how the volumes of the sustainable raw material are mathematically assigned to the final product). However, at the moment, experts are still using different methods – also known as standards – for auditing and certification.