PLA is the most widely used bioplastic in the world, but its story doesn’t end with the first use. When clean production scrap is recovered and reprocessed, you get recycled PLA — a material that is bio-based and recycled at the same time. This guide explains what R-PLA is, how it’s made, what properties and certifications it has, and where it’s actually used.
What is recycled post-industrial PLA (R-PLA)?
PLA (polylactic acid) is a plant-based polyester, produced by fermenting sugars from crops such as corn and sugarcane. It is bio-based from the first gram.
R-PLA is PLA that has been recovered and regenerated. When we talk about PIR bioplastic — post-industrial recycled — the feedstock isn’t post-consumer waste, but clean industrial scrap: production trim, offcuts, out-of-spec lots and film/thermoforming cut-offs generated inside converting companies.
PIR vs PCR: why post-industrial makes the difference
Telling PIR from PCR apart is essential, because it changes the quality of the recyclate:
- PIR (post-industrial): clean scrap, of known and traceable composition, collected at source. It allows 100% recycled content with consistent properties.
- PCR (post-consumer): mixed and potentially contaminated material, more variable.
For anyone producing compounds or technical parts, the consistency of PIR is a concrete advantage: fewer surprises in processing, repeatable performance.
How it’s made: mechanical recycling
PLA can be recycled in two ways:
- Mechanical recycling — the scrap is sorted, ground into flakes (regrind) and then re-extruded into pellets/granulate. It is low-impact and solvent-free.
- Chemical recycling — depolymerises PLA back to lactic acid monomers, with high purity but greater cost and complexity.
GIANECO works with the mechanical recycling of biopolymers: sorting at source, grinding and re-granulation, with lot-by-lot traceability. Because every heat cycle slightly shortens the molecular chains, the difference is made by proper drying and process know-how — not just the machine.
Properties of R-PLA
From a converter’s point of view, R-PLA behaves like the PLA you already know:
- Density typically around 1.24 g/cm³
- Melting in the ~150–170 °C range
- Hygroscopic: it must be dried well before processing
- Bio-based: yes, 100%
- Biodegradable / compostable: yes, to EN 13432 (industrial composting)
- Food contact approval: no — a material for technical, non-food use
- Colour: natural (milky or translucent) or re-colourable with masterbatch (white, pastels and more)
Exact values depend on the source grade and the lot, and are stated on the technical data sheet.
Pellets or regrind? Granulate and flakes compared
Recycled PLA comes in two forms, with different uses:
- Regrind (flakes): best suited to compounding and, depending on the grade, extrusion. An economical choice when the material will be reprocessed anyway.
- Pellets (granulate): re-extruded and ready to dose, suitable for 3D printing and filament, film and sheet extrusion, thermoforming and injection moulding.
Certifications: what they actually guarantee
Two distinct certification layers matter for recycled PLA:
- Recycled content: the CSI / 100% PIR certification documents the post-industrial origin and the recycled content, together with by-product status.
- Compostability: EN 13432 certifies compostability in an industrial facility (controlled environment, ~58 °C, about 6 months). Important: this is not the same as “home compostable,” nor “breaks down anywhere.”
On top of this sits lot traceability, which lets you trace the origin of every supply.
Applications of recycled PLA
Thanks to its blend of processability and sustainable origin, R-PLA fits many processes:
- 3D printing and filament
- Extrusion of film and sheet, and thermoforming
- Injection moulding (with suitable grades)
- Compounding: a base for tailored compounds, including with natural fibres (wood, hemp, flax, jute, coconut) or in PLA-based blends (for example PLA/PBS and PLA/PBAT) to tune stiffness and processability
- Technical and semi-durable goods not intended for food contact
Limits to know for an informed choice
A recycled material isn’t right for everything, and it’s fair to say so:
- Not approved for food contact
- Less suited to very high-performance products or those with critical aesthetic requirements (colour/clarity uniformity)
- Greater sensitivity to moisture, heat and UV in some contexts
- A slight loss of properties with each processing cycle, manageable through drying, formulation and compounding
How to choose a reliable R-PLA
The quality of a recycled PLA depends on the supply chain. It pays to favour a supplier who:
- sorts the scrap at source and recycles different PLA grades separately,
- guarantees lot traceability,
- provides samples for laboratory or industrial trials,
- ensures continuous supply over time.
This is the approach behind GIANECO’s Biogeo line — active since 2014 in the mechanical recycling of biopolymers, with sorting at source, recycling by grade and a lot certificate.
Frequently asked questions (FAQ)
Is recycled PLA approved for food contact? No. Biogeo R-PLA is intended for technical, non-food applications.
Is it home compostable? No. EN 13432 covers industrial composting (controlled facility, ~58 °C), not home composting.
Pellets or regrind — which is better? It depends on the process: 3D printing, extrusion and injection call for pellets; compounding is often fine with regrind.
What recycled content does it have? 100%, of post-industrial (PIR) origin.
Is it bio-based? Yes, 100%: PLA starts from plant sugars.
Want to trial it on your process?
If you’re looking for recycled post-industrial PLA for your product, we can send you the technical data sheet for the most suitable grade and a sample to test. Get in touch to talk it through.
