Open-loop recycling
Open-loop recycling is the recovery and reprocessing of discarded material into a different product system rather than the same or an equivalent product. The material may retain, lose, or occasionally gain functional value; the defining feature is the change of application, not automatically a reduction in quality, and outputs still need a viable market.
In simple terms
In an open loop, recovered material crosses from its original product system into another application. Plastic bottles might become textile fibre, or glass unsuitable for new containers might become aggregate. This can displace virgin inputs and avoid disposal, but the result depends on collection, contamination, yield, processing needs, product lifetime, and what happens after the second use. A Life cycle inventory should model actual inputs, outputs, losses, substitutions, and system boundaries rather than assume every tonne collected creates the same benefit.
Why it matters
Open-loop routes can create useful outlets where same-product recycling is impractical, but they may also delay disposal for only one cycle or shift material into an application with no further recovery path. Separating the route from the quality outcome supports clearer circularity claims and more realistic environmental comparisons.
Example
A recycler converts used food-grade PET bottles into polyester insulation. The assessment records sorting losses, processing energy, the quantity and quality of fibre produced, the virgin insulation displaced, expected service life, and end-of-life options. It describes the route as open-loop recycling without assuming that collection alone delivered a net benefit.
How it differs
Closed-loop recycling
Closed-loop recycling returns material to the same or an equivalent product system, whereas open-loop recycling moves it into a different product application.
Downcycling
Downcycling means recovered material loses quality or functional value; open-loop recycling describes a change of product system and does not necessarily imply lower quality.