Polycarbonate (PC) is an amorphous thermoplastic synthesised by interfacial polymerisation of bisphenol A (BPA) with phosgene, or by melt transesterification of BPA with diphenyl carbonate. The repeat unit contains carbonate linkages that provide optical clarity, impact strength, and heat resistance. For unfilled injection-moulding grades, density is 1.20 g/cm³ under ISO 1183-1:2019, tensile yield stress is 60–70 MPa under ISO 527-2:2012, tensile modulus is 2300–2500 MPa under ISO 527-2:2012, flexural modulus is 2350–2500 MPa under ISO 178:2019, notched Izod impact strength is 60–80 kJ/m² under ISO 180/A, heat deflection temperature is 125–135 °C under ISO 75-2:2013, and Vicat B50 softening temperature is 145–150 °C under ISO 306:2022. Melt mass-flow rate at 300 °C and 1.2 kg load ranges from 5 to 25 g/10 min under ISO 1133-1:2022. Because BPA is the monomer, the 2026 EU restriction shifts polycarbonate buyer control from mechanical property acceptance to regulatory documentation and residual-monomer verification.

EU BPA Restriction and Polycarbonate Buyers: A Compliance Checklist for 2026

Commission Regulation (EU) 2024/3190 amends Regulation (EU) No 10/2011 and repeals Regulation (EU) 2018/213. The instrument removes bisphenol A from permitted use in food-contact plastics and related materials after transitional periods. For single-use final food-contact articles, the first compliance gate falls in 2026; repeat-use articles benefit from a longer transition. The restriction therefore becomes a supply-chain defect for polycarbonate buyers whose components may contact food. Polycarbonate infant feeding bottles have been prohibited since 2011 under Regulation (EU) No 321/2011, but the 2026 gate extends the constraint to kitchen appliance handles, water dispensing components, food storage containers, and transparent lids.

Other instruments layer onto the BPA restriction. The REACH Regulation (EC) No 1907/2006 continues to require registration of polycarbonate monomers and additives. Packaging and Packaging Waste Regulation (EU) 2025/40 may impose recycled content and material reporting obligations independent of BPA compliance. Buyers should therefore separate food-contact BPA compliance from broader sustainability documentation. For non-food polycarbonate articles such as automotive headlamp lenses, electrical enclosures, and medical device housings, the food-contact prohibition does not apply. Buyers in those segments should nevertheless monitor REACH Annex XVII and customer-specific restricted substance lists because BPA-free requirements are increasingly imposed by private specifications even where EU food-contact law is not triggered.

What Must a Polycarbonate Buyer Verify Before Accepting a 2026 Lot?

Three evidence sets are required. First, the declaration of conformity under Article 15 of Regulation (EU) No 10/2011 must identify the resin grade, the legal entity placing the material on the market, and the intended food-contact conditions. Second, the formulation disclosure must state whether bisphenol A (CAS 80-05-7) is intentionally added as a monomer or additive. Third, a residual BPA test report on the resin or finished article must state the analytical method, limit of quantification, food simulant, and result. A supplier certificate that repeats “BPA-free” without these elements is not reliable for market surveillance.

Residual BPA in polycarbonate resin is determined by dissolving the sample in dichloromethane, precipitating the polymer with methanol, and analysing the extract by reversed-phase high-performance liquid chromatography with fluorescence detection. The procedure is described in CEN/TS 13130-18:2005. Migration testing of the finished article uses food simulants assigned in Annex III of Regulation (EU) No 10/2011; for long-term room-temperature storage, 10% ethanol or 3% acetic acid for 10 days at 40 °C is a representative exposure. The report should state both the method detection limit and the measured value. Values below the limit of quantification are reported as “not detected” only when the limit of quantification is at or below the regulatory threshold. Test reports issued by laboratories accredited to ISO/IEC 17025 carry greater evidentiary weight during border checks and internal supplier audits.

BPA migration from legacy polycarbonate is diffusion-controlled and increases with temperature and contact time. Ethanol-containing simulants generally produce higher migration than aqueous acid simulants because polycarbonate absorbs ethanol and swells the matrix. Repeated autoclave cycling at 121–134 °C raises residual BPA migration in legacy PC food-contact articles, which is one reason why sterilising polycarbonate kitchenware was historically flagged in EFSA opinions. For current purchasing decisions, migration kinetics are secondary to the legal prohibition; the critical control is to stop the use of BPA-based PC in food-contact articles rather than attempt to manage migration through short exposure times or low-temperature service conditions.

When Polycarbonate Buyers Must Replace or Reject a Lot

Rejection is required when the part is within the food-contact scope, the relevant transition date has passed, and the supplier cannot document that BPA is absent as an intentionally added monomer. The following matrix aligns each decision point with the applicable standard or clause.

For food-contact applications, the absence of any one of rows 2 through 5 should trigger quarantine or rejection. Non-food buyers may use the same matrix as a commercial specification, but the legal obligations differ.

Compliance is article-based rather than resin-based. A polycarbonate grade may be identical in chemistry but used in a non-food technical part and a food-contact lid; the legal status differs by final article. Under Article 19 of Regulation (EC) No 1935/2004, traceability is required at all stages. Buyers should therefore maintain separate stock-keeping units, separate production records, and separate declarations of conformity where the same resin is processed on shared injection-moulding machines. Cross-contamination can occur through regrind reuse, and a single non-compliant regrind stream may migrate into food-contact lots if silos are not validated.

Thermal Degradation Pathways and Drying Thresholds in PC Processing

Polycarbonate hydrolyses at carbonate linkages when residual moisture exceeds 0.02% at melt temperatures of 280–320 °C. Drying before processing is therefore controlled in desiccant dryers at 120 °C for 3–4 h to a target moisture below 0.02%. Production-scale equipment includes single-screw extruders with L/D ratios of 30–36 and injection-moulding machines with clamp force calculated at 0.5–0.8 tonnes per square centimetre of projected area. Barrel residence time is controlled by limiting shot volume to 60–80% of capacity. Melt temperature measured at the nozzle should remain below 320 °C; above this threshold, Fries rearrangement and oxidative yellowing become significant. Polycarbonate is incompatible with strong alkalis, ketones, aromatic esters, and some amine-based additives; these materials should be excluded from cleaning, storage, and downstream assembly operations.

What Limits the Viable Processing Window in BPA-Free Replacement Resins?

Replacement resins may have a lower thermal decomposition onset than BPA-based PC. Melt mass-flow rate at 300 °C and 1.2 kg is only a single-point check; capillary rheometry from 100 to 5000 s⁻¹ is needed to detect shear sensitivity differences. In production trials, a resin with equivalent melt flow rate under ISO 1133-1:2022 can still exhibit poor knit-line strength in multi-gate tools because shear heating reduces molecular orientation. Injection pressure, hold time, and mould temperature should be adjusted after measuring pressure-specific volume–temperature behaviour on the actual grade. If the replacement resin has higher notch sensitivity, notched Izod values measured under ISO 180/A may fall below the end-use minimum, and this should be treated as a property cliff-edge rather than a linear adjustment. Published data for this substitution is grade-specific; no generic safety factor applies.

Mould temperature is adjusted because BPA-free copolyesters and polycarbonate copolymers often require lower mould temperature than the 80–100 °C used for homopolymer PC. Higher mould temperature improves flow and reduces internal stress, but it may extend cycle time. The buyer’s specification should include not only the ISO mechanical data but also UL 94 rating for electrical use, and any ISO 10993 testing for medical use.

Reformulation away from homopolymer BPA-based PC is not a drop-in substitution. Candidate resins include polycarbonate copolymers, co-polyesters, polysulfones, and polyetherimides. The processing window typically narrows; melt viscosity may increase at the same temperature, and impact retention after thermal aging may fall below the value required by the end-use specification. Published data for these specific configurations is limited, so each replacement lot must be qualified under ISO 527-2:2012, ISO 178:2019, and ISO 180/A rather than accepted from a generic resin brochure. Thermal aging at 80 °C for 500 h can expose embrittlement that is not visible in short-term mechanical testing.

Where the polycarbonate article is outside the food-contact scope, the buyer should document the end-use and confirm that the object is not reasonably expected to contact food. The technical file should retain the customer drawing, intended use statement, and any private restricted substance specification. If the same polycarbonate grade is used in both food-contact and non-food production, material segregation and batch traceability are necessary to prevent cross-contamination. Confirm whether a “BPA-free” polycarbonate or copolyester is actually free of bisphenol analogues such as bisphenol S (CAS 80-09-1) or bisphenol F (CAS 620-92-8), because substitution with an unverified analogue may create a new regulatory liability. An ambiguous end-use should be classified under the more conservative regulatory assumption.