Overview / Challenges
Challenges
Twelve constraints decide whether a bio-based polymer moves from paper to product. For each: why it matters, how it is measured, and what evidence the tracker looks for. No numerical pass/fail limits are set.
Heat resistance & HDTBrittleness, impact & ageingMoisture & hydrolytic stabilityProcessing window & crystallisation speedBarrier propertiesDurability in long-life productsFeedstock availability, land use & variabilityScale-up, capacity vs real outputCost per kg resin and per finished partComparable climate footprintBio-based content & claim accounting (C14 vs mass balance)End of life & recyclability streams
Heat resistance & HDT
- Why it matters
- PLA in particular softens near its glass transition unless crystallised, which limits use in warm environments and durable parts. Stereocomplex PLA and nucleation are the main levers. [Nagarajan 2016; Tsuji 2005; Saeidlou 2012]
- How it is measured
- Heat deflection temperature (HDT) and Vicat softening under a stated load; DSC for Tg, Tm and crystallinity; DMA. Standards →
- Evidence we look for
- HDT or Vicat with load and specimen state (annealed or not), measured on the same grade as the claim, ideally next to the incumbent.
Brittleness, impact & ageing
- Why it matters
- Several bio-based polyesters are stiff but brittle, and blending or copolymerisation trades stiffness for toughness. Physical ageing can change properties over time. [Jiang 2006; Noda 2004; Nagarajan 2016; Imre 2013]
- How it is measured
- Notched impact (Izod or Charpy), elongation at break, tensile tests before and after conditioning. Standards →
- Evidence we look for
- Impact and elongation with notch type and conditioning; results after ageing, not only as-moulded.
Moisture & hydrolytic stability
- Why it matters
- Ester bonds hydrolyse and amide groups absorb water; both change properties in humid service and during processing. [Laycock 2017; Winnacker 2016; Lim 2008]
- How it is measured
- Water uptake, property retention after humidity or hot-water ageing, molar-mass loss. Standards →
- Evidence we look for
- Retention of a named property after a stated humidity/temperature exposure and duration.
Processing window & crystallisation speed
- Why it matters
- Thermal and hydrolytic degradation in the melt and slow crystallisation lengthen cycle times and narrow the window between melting and degradation. [Lim 2008; Saeidlou 2012; Noda 2004]
- How it is measured
- Melt flow before and after processing, molar mass, crystallisation half-time, cycle time. Standards →
- Evidence we look for
- Processing on industrial-type equipment with drying conditions, residence time and cycle time reported.
Barrier properties
- Why it matters
- Gas and water-vapour barrier decide packaging use. PEF's barrier advantage over PET comes from suppressed furan ring motion. [Burgess 2014; Auras 2004]
- How it is measured
- Oxygen, CO₂ and water-vapour transmission rates at stated temperature, humidity and thickness. Standards →
- Evidence we look for
- Permeability with test conditions and thickness, compared with the incumbent measured the same way.
Durability in long-life products
- Why it matters
- Durable products need property retention over years; inherently dynamic or hydrolysable chemistries must show long-term stability. [Nagarajan 2016; Fortman 2018; Laycock 2017]
- How it is measured
- Accelerated ageing (heat, humidity, UV) with property retention; creep. Standards →
- Evidence we look for
- Retention data over stated ageing protocols; real-time data where available.
Feedstock availability, land use & variability
- Why it matters
- The Commission notes that unsustainably harvested feedstocks can drive deforestation, biodiversity loss or land-use competition with food crops. Waste and residue feedstocks vary in composition. [Bugnicourt 2014; Isikgor 2015] — European Commission, COM(2022) 682 final, retrieved 20 Oct 2026
- How it is measured
- Feedstock type and origin, certification, batch-to-batch variability. Standards →
- Evidence we look for
- Named feedstock and origin; certification scheme; variability data for waste-based feedstocks.
Scale-up, capacity vs real output
- Why it matters
- Announced or nameplate capacity is not output. Plants can be delayed, run below capacity or close.
- How it is measured
- Demonstrated stage (lab, pilot, demo, industrial); capacity status (announced, under construction, commissioned, operating, actual output). Standards →
- Evidence we look for
- Capacity with its status and facility; operating evidence such as commissioning dates or reported production.
Cost per kg resin and per finished part
- Why it matters
- A price per kg says little without date, volume, grade and basis (selling price, production cost or target); part cost also depends on processing.
- How it is measured
- Price or cost with currency, date, region, volume, grade and basis. Standards →
- Evidence we look for
- A cost figure with all of its basis fields; otherwise recorded as ND (not disclosed).
Comparable climate footprint
- Why it matters
- Footprints are only comparable with the same functional unit, system boundary, data year, energy mix and allocation. Eerhart et al., for example, report PEF versus PET for a cradle-to-grave system. [Eerhart 2012; Walker 2020; Spierling 2018; Lambert 2017]
- How it is measured
- ISO 14040/14044 LCA; ISO 14067 carbon footprint. Standards →
- Evidence we look for
- Value with functional unit, boundary, geography, data year, comparator, allocation, biogenic-carbon treatment and review type. No reduction is computed across different boundaries.
Bio-based content & claim accounting (C14 vs mass balance)
- Why it matters
- Measured bio-based carbon (radiocarbon) and mass-balance attribution answer different questions. The Commission states that mass-balance accounting is not considered suitable for confirming the actual share of bio-based content, and that radiocarbon methods should be preferred.
attributing a share to end-products through mass balance accounting is a method which is not considered suitable for confirming the actual share of biobased content
— European Commission, COM(2022) 682 final, retrieved 20 Oct 2026Radiocarbon-based methods should be preferred as their results are robust and their use is widely accepted.
— European Commission, COM(2022) 682 final, retrieved 20 Oct 2026 - How it is measured
- EN 16640 / ASTM D6866 / ISO 16620 (measured content); ISO 22095 and schemes such as ISCC PLUS (chain of custody). Standards →
- Evidence we look for
- Whether a claim is measured or attributed, the method, and the share.
End of life & recyclability streams
- Why it matters
- Biodegradability depends on the environment; industrial compostability does not imply home compostability; compostable plastics in recycling streams contaminate them. [Haider 2019; McKeown 2020]
compliance with standards for industrial composting does not imply decomposition in home composting
— European Parliament and Council, Regulation (EU) 2025/40 (OJ L, 2025/40, 22.1.2025), retrieved 20 Oct 2026There is a European standard for industrially compostable packaging but not for home composting as the conditions for the latter can differ significantly
— European Commission, COM(2022) 682 final, retrieved 20 Oct 2026 - How it is measured
- EN 13432, ISO 17088, ASTM D6400 (industrial composting); environment-specific biodegradation tests. Standards →
- Evidence we look for
- Which environment and standard; certification; recycling route (mechanical, chemical) with demonstrated scale.