Buyer's guide

Recycled plastic pellets: what to buy and how to check it

Sourcing recycled pellets is not like sourcing virgin resin. There is no single grade sheet, quality varies by supplier and by batch, and the word 'recycled' covers everything from a tightly controlled industrial stream to unsorted mixed waste. This guide covers what to ask for and how to verify it.

Quick answer

Recycled plastic pellets are post-consumer or post-industrial plastic waste that has been sorted, washed, extruded and cut into a uniform granule for reprocessing. The main types are rPET, rHDPE, rLDPE, rPP and mixed polyolefins. Judge a supplier on four numbers — melt flow index, density, ash content and moisture — plus batch homogeneity and documented traceability. For durable non-food-contact goods, post-consumer recycled polyolefins typically cut embodied CO₂ by around 1.5 t per tonne substituted.

Main types: rPET, rHDPE, rLDPE, rPP, mixed polyolefin
Post-consumer (PCR) vs post-industrial (PIR): PCR counts toward regulatory targets
Key specs: MFI, density, ash content, moisture, colour
Batch homogeneity matters more than headline specification
Food contact requires an EFSA-authorised recycling process
PPWR sets binding recycled-content targets for plastic packaging in the EU

The types you will be quoted

Recycled pellets are sold by polymer family, and each has a distinct source stream and market.

rPET — from bottles; the most mature stream, food-grade available through approved processes.
rHDPE — from milk and detergent bottles; rigid, high-volume, well-established pricing.
rLDPE — from film; sensitive to contamination, best quality from industrial collection.
rPP — from caps, crates and automotive; wide property range depending on the source.
Mixed polyolefin / PolyAl — blended PE/PP streams, sometimes with mineral or metal content; lowest cost per kilo, excellent for durable moulded goods.

The four numbers that decide whether it runs

Melt flow index is the single most important. It tells you how the melt will behave on your tool, and drift between batches is what causes short shots, flash and scrap. Ask for the tested MFI per batch, not a range on a marketing sheet.

Density identifies the polymer and reveals filler content. Ash content quantifies the inorganic load directly — mineral filler, metal, pigment. Moisture matters because polyolefins absorb little but pellets carry surface water; excess causes splay and voids. Together these four define processability far better than the polymer name.

Batch homogeneity: the quality issue nobody quotes

Most recycled-pellet complaints are not about the specification being wrong. They are about the specification being right on average and wrong in detail: a supplier blends feedstock from several sources, the average hits the datasheet, and your mould sees a different material every few hours.

Ask a direct question: how large is a homogeneous batch, and is it produced from a single feedstock source? A supplier who processes in defined lots — for example 60-tonne batches from one source stream — is giving you something structurally different from one who blends continuously. This is worth more than a slightly better headline MFI.

Certification, traceability and regulation

Post-consumer recycled content is what regulators count. The EU Packaging and Packaging Waste Regulation sets binding recycled-content targets, and CSRD/ESRS E1 reporting makes purchased materials part of a company's Scope 3 category 1 inventory. Your customers will increasingly ask you for evidence, not a claim.

Practical checklist: a certificate of analysis per batch, a stated recycled-content percentage, origin traceability, a relevant product standard where one exists (for example UNE 53925:2026 for recycled polyolefins from cartons), and — if the claim is going into a sustainability report — a product carbon footprint calculated to a recognised method.

What drives the price

Recycled pellet pricing is set by feedstock scarcity, processing cost and the virgin resin market. When virgin polyolefin prices fall, recyclate loses its cost advantage and marginal recyclers idle capacity — which is why recycled pricing is volatile in a way buyers often do not anticipate.

Levers you control: accept a darker or unspecified colour, accept a wider MFI window, order in full-batch quantities rather than part loads, and commit to a contract rather than spot buying. Each of those materially reduces price. Materials from a stable, non-kerbside source stream also tend to price more predictably because their supply is decoupled from consumer collection rates.

What to request from any supplier

Certificate of analysis	Per batch, with tested values not ranges
Melt flow index	Tested value and test conditions (e.g. 190 °C / 2.16 kg)
Density	kg/m³, to identify polymer and filler load
Ash content	Quantifies inorganic content directly
Moisture	Especially relevant for washed streams
Recycled content	Stated %, post-consumer vs post-industrial
Batch size	How large is a homogeneous lot?
Traceability	Documented origin of the feedstock
Standard	Applicable product standard, e.g. UNE 53925:2026
Carbon footprint	PCF to a recognised method, for Scope 3 reporting

Buying recycled plastic pellets: FAQ

What is the difference between post-consumer and post-industrial recycled pellets?

Post-industrial (PIR) is factory scrap: clean, consistent, but it never reached a consumer, so most regulations and recycled-content claims give it less or no credit. Post-consumer (PCR) comes from used products and is what PPWR targets and Scope 3 reporting recognise.

Can recycled pellets be used for food contact?

Only if the recycling process is authorised for food contact — in the EU, an EFSA-evaluated process. rPET is the mature case. Most recycled polyolefins, including carton-derived material, are for durable non-food-contact applications.

How much CO₂ do recycled pellets save?

For polyolefins, roughly 1.5 tonnes of CO₂e per tonne substituted, because you avoid fossil feedstock extraction and cracking. The exact figure depends on the process energy mix; ask for a calculated product carbon footprint rather than a generic claim.

Why does the colour vary between batches?

Because input packaging colour varies. Most post-consumer polyolefin recyclate is dark grey to black by default. If you need a specific colour, either buy a sorted colour stream at a premium or compound with pigment yourself — starting from a consistent dark base is often cheaper.

What minimum order should I expect?

Typically one full homogeneous batch — often around 60 tonnes for polyolefin producers — delivered in 1,000 kg big bags on pallets. Smaller trial quantities are usually available, but expect a higher price per kilo.

How do I validate a new recycled grade before committing?

Run a trial batch on the actual tool, not a lab sample. Check shrinkage, cycle time, scrap rate and part dimensions, and ask the supplier to reserve material from the same lot so your production order matches what you tested.

Evaluating recycled polyolefin suppliers?

We supply recycled PolyAl pellets in homogeneous 60-tonne batches, produced following UNE 53925:2026 with full traceability for Scope 3 reporting.

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