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Calculating the carbon footprint of recycled versus virgin plastics requires ISO 14067:2018 as the governing methodology, a cradle-to-gate system boundary for material-level comparisons, and a disclosed allocation method — because the same recycled plastic material can show carbon footprints differing by 20–60% depending on which allocation approach is applied. Published LCA literature indicates GHG reductions of 30–80% by polymer type when switching from virgin to recycled, but only supplier-provided PCF data meeting ISO 14067 requirements is valid for CSRD Scope 3 Category 1 activity-based reporting.
Before comparing carbon footprint figures for recycled and virgin plastic, the calculation framework must be established. Two documents govern credible PCF calculations for plastic materials — and understanding what each requires determines what you need to ask your supplier to provide.
ISO 14067:2018 is the international standard for quantification and communication of the carbon footprint of products. It defines system boundaries, functional unit specification, allocation rules, data quality requirements, and the format of PCF certificates. A PCF certificate that references ISO 14067 as its methodology is the minimum credibility requirement for use in CSRD ESRS E1 Scope 3 Category 1 reporting. A supplier who cannot reference ISO 14067 in their carbon footprint documentation is providing secondary or estimated data — not primary PCF data.
The GHG Protocol Product Standard is the corporate reporting framework that aligns with ISO 14067 for product-level emissions. It is the reference standard for CDP Supply Chain submissions and for SBTi Scope 3 target-setting and tracking. For buyers whose reporting obligation is a CDP or SBTi submission rather than a CSRD filing, GHG Protocol Product Standard compliance is the equivalent requirement — and a PCF certificate meeting ISO 14067 also meets GHG Protocol Product Standard data quality requirements.
For plastic material comparisons, the functional unit is expressed as 1 kg of material delivered to the customer (cradle-to-gate). This is the standard functional unit for material supplier PCF certificates. It allows direct comparison between a virgin PET PCF and a recycled PET PCF on a per-kilogram basis. A PCF certificate expressed per product unit, per tonne-kilometre, or per batch rather than per kilogram cannot be directly used in a Category 1 activity-based calculation without unit conversion.
The system boundary defines which life cycle stages are included in the PCF calculation. For plastic material procurement decisions, two boundaries matter:
Cradle-to-Gate
From raw material extraction (or waste collection for recycled) through material production to the supplier's factory gate. This is the standard boundary for material supplier PCF certificates and enables direct polymer-to-polymer comparison. Both figures must use cradle-to-gate for the comparison to be valid.
Cradle-to-Grave
Includes use phase and end-of-life treatment. Required for product-level Environmental Product Declarations (EPDs) but creates comparison problems for material procurement decisions. Comparing a cradle-to-grave figure for one material against a cradle-to-gate figure for another is not a valid comparison — the system boundaries are different and the figures are not additive.
This is the most common data quality error in recycled plastic carbon footprint comparisons: a buyer receives a cradle-to-gate PCF for virgin PET from one supplier and a cradle-to-grave PCF for rPET from another, concludes the rPET figure is higher, and incorrectly infers that the recycled material has a larger carbon footprint. Always confirm the system boundary before comparing PCF figures.
Sustainability teams frequently discover, when comparing PCF data from two recycled plastic suppliers for the same polymer type, that the figures differ by 30–60% despite both being described as ISO 14067-compliant. The cause, in almost every case, is a difference in allocation method — not a difference in the actual environmental performance of the material. Understanding why this happens is the single most important methodological concept for anyone comparing recycled plastic carbon footprint data.
Recycled plastic production involves shared upstream processes — waste collection, sorting, cleaning, and pre-processing — that serve multiple output streams simultaneously. The PCF calculation must assign (allocate) the GHG emissions from these shared processes to the recycled pellet output. The allocation method chosen determines how much of the upstream emissions land on the material, and therefore what the final emission factor in kgCO₂e/kg will be.
Upstream emissions are divided among output streams in proportion to their mass. This is the most straightforward method to calculate and audit, which is why it is widely used in commercial PCF certificates. For recycled plastic production, mass allocation tends to assign a larger share of upstream emissions to the recycled pellet output, producing a more conservative (higher) PCF figure.
Practical effect: A recycled PET PCF calculated under mass allocation might show 1.4 kgCO₂e/kg. The same material calculated under system expansion might show 0.6 kgCO₂e/kg. Both numbers can be ISO 14067-compliant.
Upstream emissions are divided among output streams in proportion to their economic value. Where the waste feedstock has low or negative economic value — as is common in post-consumer plastic waste — economic allocation can significantly reduce the emissions allocated to the recycled pellet output compared to mass allocation. The result varies substantially with market conditions for waste feedstock pricing.
Practical effect: Less commonly used in plastics PCF certificates due to price volatility, but may appear in certificates from certain certification bodies.
Also called the substitution method. The recycled material production process is credited with avoiding the production of an equivalent quantity of virgin material. This assigns the full virgin material production emission savings as a negative credit to the recycled production PCF — producing the lowest, and sometimes negative, PCF figures for recycled plastics. Some ISCC PLUS Proof of Sustainability GHG calculations use a form of system expansion reasoning.
Practical effect: A system expansion PCF for rPET might show 0.3–0.6 kgCO₂e/kg — significantly below a mass allocation figure for the same material. ISO 14067 permits system expansion but requires full disclosure of the methodology.
Key Procurement Rule
When comparing PCF data from two recycled plastic suppliers, confirm that both certificates disclose the same allocation method before treating the figures as comparable. ISO 14067 requires the allocation method to be stated in the certificate — if a certificate does not disclose this information, it does not meet ISO 14067 requirements and cannot be used in a CSRD Scope 3 calculation. Always check this field before using any PCF figure in a compliance submission.
The following emission factor ranges are representative figures drawn from published LCA literature — including PlasticsEurope Eco-profiles, ecoinvent database inventories, and peer-reviewed life cycle assessment studies. They are not product-specific PCF values and cannot be used directly in CSRD Scope 3 calculations. Their purpose is to orient procurement teams on the magnitude of carbon savings available by polymer type and to identify which materials offer the highest GHG reduction potential when switching from virgin to recycled feedstock.
All figures below: representative ranges from published LCA literature (PlasticsEurope Eco-profiles, ecoinvent). Product-specific PCF data requires ISO 14067-compliant calculation by the material supplier.
Virgin PET
~2.2–3.4 kgCO₂e/kg
Recycled rPET
~0.5–1.8 kgCO₂e/kg
Key reduction driver
Avoidance of TPA and EG synthesis
PET is energy-intensive to produce from petrochemical feedstock — terephthalic acid and ethylene glycol synthesis account for the majority of the virgin production footprint. Mechanical rPET bypasses these synthesis steps entirely, producing one of the largest absolute GHG reductions available in commodity plastics. Topcentral grade: TC-Rester® recycled PET pellets
Virgin PP
~1.6–2.1 kgCO₂e/kg
Recycled rPP
~0.4–1.2 kgCO₂e/kg
Key reduction driver
Avoidance of propylene polymerization
The wide reduction range for rPP reflects the diversity of post-consumer PP waste streams and recycling process energy inputs. Zero Carbon grades available via FreeCBO2® brand for applications requiring net-zero material inputs. Topcentral grade: Ploypoy® recycled PP pellets
Virgin PE
~1.5–2.0 kgCO₂e/kg
Recycled rPE
~0.3–1.1 kgCO₂e/kg
Key reduction driver
Avoidance of naphtha steam cracking
Virgin PE production is dominated by the energy requirements of ethylene production via steam cracking of naphtha — a high-temperature, energy-intensive process. Mechanical recycling bypasses this step. Topcentral grade: Poisye® recycled PE pellets
Virgin ABS
~3.5–5.2 kgCO₂e/kg
Recycled rABS
~1.0–2.5 kgCO₂e/kg
Key reduction driver
Avoidance of acrylonitrile synthesis
ABS has a notably high virgin production footprint because all three monomers — acrylonitrile, butadiene, and styrene — require energy-intensive synthesis processes. Acrylonitrile synthesis is the highest-emission step. Electronics and appliance OEMs switching to rABS achieve among the largest absolute Scope 3 reductions per kilogram of material substituted. Topcentral grade: IBISS® recycled ABS pellets
Virgin PC
~5.5–8.0 kgCO₂e/kg
Recycled rPC
~1.5–3.5 kgCO₂e/kg
Key reduction driver
Avoidance of BPA synthesis + polycondensation
Polycarbonate has one of the highest virgin production footprints among commodity engineering plastics — BPA synthesis and the polycondensation reaction are both energy and chemical-intensive. rPC delivers some of the largest per-kilogram GHG reductions available in engineering plastic substitution. Zero Carbon grades available via FreeCBO2® brand. Topcentral grade: PCR PC® recycled polycarbonate pellets
Virgin PA6
~7.0–9.5 kgCO₂e/kg
Recycled rPA6
~1.5–4.0 kgCO₂e/kg
Key reduction driver
Avoidance of caprolactam synthesis
PA6 has the highest virgin production footprint of any commodity engineering plastic covered here. Caprolactam synthesis — the precursor monomer — is one of the most energy-intensive steps in polymer production. Automotive OEMs switching from virgin PA6 to recycled nylon achieve the largest per-kilogram Scope 3 Category 1 reductions of any polymer substitution decision. Topcentral grade: Nairong® recycled PA6 nylon pellets
| Polymer | Virgin Range (kgCO₂e/kg) | Recycled Range (kgCO₂e/kg) | Typical Reduction | Topcentral Grade |
|---|---|---|---|---|
| PET | 2.2–3.4 | 0.5–1.8 | 40–75% | TC-Rester® rPET |
| PP | 1.6–2.1 | 0.4–1.2 | 30–70% | Ploypoy® rPP |
| PE | 1.5–2.0 | 0.3–1.1 | 30–65% | Poisye® rPE |
| ABS | 3.5–5.2 | 1.0–2.5 | 40–70% | IBISS® rABS |
| PC | 5.5–8.0 | 1.5–3.5 | 45–75% | PCR PC® rPC |
| PA6 | 7.0–9.5 | 1.5–4.0 | 50–80% | Nairong® rPA6 |
Source: Representative ranges from published LCA literature including PlasticsEurope Eco-profiles and ecoinvent database inventories. Product-specific PCF values require ISO 14067-compliant calculation by the material supplier and will differ from these ranges.
The following worked example uses a packaging manufacturer procuring 500 tonnes per year of PET resin, switching from virgin PET to TC-Rester® rPET. The PCF figures used are illustrative for calculation methodology purposes — actual emission factors must come from ISO 14067-compliant supplier certificates.
Calculate Current Scope 3 Category 1 Baseline
Annual volume: 500,000 kg/year
Supplier PCF (virgin PET, ISO 14067, cradle-to-gate): 2.8 kgCO₂e/kg
500,000 kg × 2.8 kgCO₂e/kg = 1,400 tCO₂e/year
Calculate Post-Switch Scope 3 Category 1 Emission
PCFNow certificate (TC-Rester® rPET, ISO 14067, cradle-to-gate, mass allocation): 1.1 kgCO₂e/kg
500,000 kg × 1.1 kgCO₂e/kg = 550 tCO₂e/year
Calculate Absolute GHG Reduction
1,400 − 550 = 850 tCO₂e/year reduction
Calculate Percentage Reduction
850 ÷ 1,400 = 60.7% Scope 3 Category 1 reduction from this material line
Document for CSRD / CDP Submission
The complete documentation package for this calculation:
Result: 850 tCO₂e/year reduction — 60.7% Category 1 savings from a single material line switch
Based on illustrative PCF figures for methodology demonstration. Actual savings depend on verified ISO 14067 supplier PCF data.
A supplier statement confirming recycled content — without an emission factor in kgCO₂e/kg, a system boundary declaration, and an allocation method disclosure — fails the data quality requirements of the GHG Protocol Corporate Value Chain Standard and CSRD ESRS E1. It cannot be entered into a Scope 3 Category 1 activity-based calculation. Spend-based estimation using EEIO factors is the fallback — but CSRD reporting guidance prioritizes supplier-provided primary data as the higher-quality method. Buyers who accept generic recycled content statements instead of ISO 14067 PCF certificates are building their CSRD Scope 3 inventory on the lowest-quality data tier available.
For PPWR 2026 deadline obligations and CSRD ESRS E1 compliance simultaneously, request both a GRS TC or ISCC PLUS PoS and an ISO 14067 PCF certificate from every plastic material supplier.
Each major sustainability reporting framework has specific requirements for plastic material carbon footprint data that determine what supplier documentation you need to collect — and what format it must be in.
CSRD (ESRS E1)
Requires: Scope 3 Category 1 disclosure, activity-based method preferred over spend-based.
Data format: kgCO₂e/kg × volume (kg) = tCO₂e. ISO 14067 certificate required for activity-based calculation.
PCFNow provides: ISO 14067 PCF certificate per material grade — directly usable in ESRS E1 Category 1 calculation.
CDP Supply Chain
Requires: Scope 3 Category 1 data with emission factors. Primary supplier data scores higher quality than estimated data.
Data format: Supplier-provided primary PCF data attributable to specific facility and production batch.
PCFNow provides: Primary PCF data per material grade, facility-attributable — maximum CDP data quality score.
SBTi Targets
Requires: Scope 3 Category 1 baseline and year-on-year reduction tracking against absolute targets.
Data format: Consistent, comparable PCF data from same supplier across annual reporting cycles.
PCFNow provides: ISO 14067 PCF data updated annually — enabling year-on-year SBTi progress tracking.
Some PCF certificates include end-of-life carbon credits — the avoided burden or recycled content method — which assign a credit to materials based on their recyclability at end of product life. These credits reduce the reported PCF figure and are legitimate within specific ISO 14067 calculation scenarios. However, they are not recognized in GHG Protocol Scope 3 Category 1 (purchased goods) reporting. End-of-life credits belong to Scope 3 Category 12 (end-of-life treatment of sold products). If a PCF certificate you receive includes end-of-life credits in the stated emission factor, you must exclude those credits before using the figure in a Category 1 calculation. Always confirm whether the certificate includes or excludes end-of-life credits — this field should be explicitly disclosed in any ISO 14067-compliant certificate.
Topcentral's PCFNow carbon footprint platform provides product-level PCF certificates for each material grade across the core recycled pellet product lines — TC-Rester® rPET, Ploypoy® rPP, IBISS® rABS, PCR PC® rPC, Poisye® rPE, and Nairong® rPA6/rPA66. Each certificate is structured for direct use in CSRD ESRS E1 and GHG Protocol Category 1 activity-based calculations.
The GHG Protocol data quality assessment framework evaluates supplier-provided PCF data on dimensions including temporal representativeness, geographical representativeness, and technological representativeness. Topcentral's Back2Circle supply chain traceability platform — using blockchain, IoT, and AI to track material origin from waste collection through processing — provides the supply chain data that supports and improves the data quality rating of PCFNow PCF certificates. For buyers whose reporting framework requires demonstrating data quality levels, this traceability layer matters beyond the certificate itself.
For procurement teams whose Scope 3 targets require net-zero material inputs in specific product lines, Zero Carbon grades are available under the FreeCBO2® brand for Ploypoy® rPP and PCR PC® rPC. These grades carry Zero Carbon certification alongside standard PCFNow PCF documentation, supporting product-level net-zero claims where the material input footprint must be fully offset or neutralized.
Topcentral's PCFNow platform provides product carbon footprint certificates for TC-Rester® rPET, Ploypoy® rPP, IBISS® rABS, PCR PC® rPC, Poisye® rPE, and Nairong® rPA6/rPA66 — with emission factors in kgCO₂e/kg, ISO 14067 methodology reference, system boundary disclosure, and allocation method stated. Zero Carbon grades available via FreeCBO2® for rPP and rPC. Full Scope 3 documentation package provided with every commercial order.
Lena.wang@topcentral.cn | +86 15990263642
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