The amount of recycled material that makes up a product, based on the total of all its recycled parts.
Materials coming from scrap reutilisation—such as rework, regrind, or scrap generated and reclaimed within the same process—are not considered recycled content.
e.g. A garment labeled as containing 50% recycled content may include fibers recovered from both pre-consumer and post-consumer sources.
From ECONYL® Blog
Pre-consumer Material
Pre-consumer (also called post-industrial) material is waste diverted from the manufacturing process before the product is completed.