Bisphenol A (BPA) SVHC Status: What It Means for Your Epoxy Resin Order

Bisphenol A — CAS 80-05-7; EC 201-245-8 — was included on the ECHA Candidate List of substances of very high concern under Article 59 of Regulation (EC) No 1907/2006 on 12 January 2017. The listing was based on the endocrine disrupting properties of BPA under Article 57(f), and it activates substance-of-very-high-concern duties that differ depending on whether the ordered material is BPA monomer, an uncured epoxy resin mixture, or a cured article. A supplier may continue to place bisphenol A-based liquid epoxy resin on the EU market, but the order documentation must distinguish free residual BPA from the BPA-derived polymer backbone. The Candidate List entry applies to the monomeric substance BPA, not to the reacted diglycidyl ether polymer. Commercial liquid bisphenol A diglycidyl ether resins are normally specified by an epoxide equivalent weight of 182–192 g/eq and a dynamic viscosity of 11–14 Pa·s at 25 °C; free BPA is typically controlled to low double-digit mg/kg by vacuum stripping after condensation of bisphenol A with epichlorohydrin. A purchase specification should therefore state residual BPA in mg/kg as a separate certificate line.

Bisphenol A epoxy resins are produced by the condensation of bisphenol A with epichlorohydrin under alkaline conditions. The primary monomeric product, bisphenol A diglycidyl ether, has a molecular weight of 340.41 g/mol; higher oligomeric homologues form as the molar ratio of epichlorohydrin to BPA decreases. The aryl ether backbone contains a BPA-derived unit, but this unit is covalently bound and is not the free BPA substance identified on the Candidate List. Analytical methods that hydrolyse the resin or derivatise the backbone can over-report total BPA-equivalent content and should not be used for REACH Candidate List verification unless the procedure specifically isolates free BPA.

The operational trigger for Candidate List duties is 0.1% w/w residual BPA in an article, not in the liquid resin mixture. A formulated epoxy resin containing less than 0.1% w/w free BPA does not give rise to Article 33 communication for the mixture, but a cured composite containing free BPA above this threshold requires downstream declarations and SCIP submission. If the supplied material is a mixture, the legal route is the safety data sheet under Articles 31 and 32; if the supplied material is an article, the obligations under Articles 7 and 33 apply.

Where Does BPA Sit in the REACH Candidate List?

The Candidate List entry for BPA is reasoned under Article 57(f), which addresses substances for which there is scientific evidence of probable serious effects to human health or the environment and which raise a level of concern equivalent to substances classified as carcinogenic, mutagenic, or toxic for reproduction. BPA also carries a harmonised classification under Regulation (EC) No 1272/2008 as Repr. 1B H360F, with the generic reproductive toxicity cut-off of 0.3% w/w for mixtures unless a specific concentration limit is set. This creates a regulatory split: a cured epoxy article containing 0.2% w/w residual BPA may not be classified as a reproductive toxicant mixture under CLP, but it still triggers Candidate List communication because the article threshold is 0.1% w/w. For an uncured resin mixture, Section 3.2 of the SDS should list BPA where relevant, and Section 15.1 should state the Candidate List status even though Article 33 does not apply to the mixture itself. The Candidate List entry is not a restriction; it is a supply-chain information and risk-management gateway under REACH.

BPA is not currently placed on Annex XIV of REACH, so no authorisation requirement for use in epoxy resin manufacture is in force. Annex XVII entry 66 restricts BPA in thermal paper at a limit of 0.02% w/w, but this entry does not establish a generic limit for epoxy resins, adhesives, coatings, or composites. Procurement personnel should therefore not interpret the thermal paper restriction as a prohibition on BPA-based epoxy resin formulations. In addition, the Candidate List inclusion date is significant for notification timing. Under Article 7(7), producers and importers of articles containing a newly listed Candidate List substance have 6 months from the inclusion date to notify ECHA if the conditions are met. This deadline applies to articles placed on the market after the inclusion date; existing stock supplied before the Candidate List inclusion may not trigger retroactive notification, but Article 33 communication applies to supplies after inclusion.

Notifications to ECHA and SCIP Database Duties

For a cured epoxy article produced or imported in the EU containing BPA above 0.1% w/w, Article 7(2) of REACH requires notification to ECHA when the total quantity of BPA in all such articles exceeds 1 t/y per legal entity. Notification is not required where the substance has already been registered for that use or where exposure can be excluded during use and disposal; Article 33 communication duties nevertheless continue without a tonnage trigger. Under Article 33(1), the supplier must transmit sufficient information to allow safe use, and under Article 33(2) the same information must be provided to a consumer upon request within 45 days free of charge. A composites fabricator receiving a cured BPA-containing component above the threshold must therefore pass the substance name, the Candidate List reason, and safe-use information to downstream customers. Since 5 January 2021, the Waste Framework Directive 2008/98/EC as amended by Directive 2018/851 has additionally required article suppliers to submit data to the ECHA SCIP database under Article 9(1)(i) when the article contains a Candidate List substance above 0.1% w/w. A cured epoxy shell containing residual BPA above this threshold requires a SCIP submission before placement on the EU market, even when no ECHA notification is triggered below 1 t/y.

Residual BPA in liquid DGEBA is controlled by the molar excess of epichlorohydrin during alkaline condensation of bisphenol A and by the downstream vacuum stripping step. In a thin-film evaporator operating at jacket temperatures of 120–150 °C and residual pressures below 5 mbar, free BPA can be reduced to below 100 mg/kg; however, high-viscosity solid epoxy grades with high oligomer content may retain higher residual monomer when stripping temperature is limited to prevent advancement. The analytical certificate for an epoxy resin order should therefore report free BPA in mg/kg, not as a total BPA-derived structural content. Because the SVHC threshold in a solid article is 1000 mg/kg (0.1% w/w), a liquid resin with a reported free BPA content of 50 mg/kg may still produce a cured article above the threshold if filler content is low and no further dilution occurs. The calculation should be based on the finished article formulation, not on the liquid resin as supplied.

When an Imported Cured Composite Contains BPA Above the 0.1% Threshold

An importer of cured epoxy composite parts is the legal entity responsible for Article 7(2) notification and SCIP submission if the parts contain residual BPA above 0.1% w/w, unless the non-EU supplier has appointed an EU-based only representative for the substance or the data is already available through a registrant. In a manufacturing environment, the presence of residual BPA in cured epoxy parts is not controlled by the liquid resin specification alone; low-molecular-weight fractions may survive the cure cycle, and residual BPA can be distributed inhomogeneously in thick sections. Published data for specific combinations of amine hardeners and bisphenol A-based liquid epoxy resins in cured composites are limited; therefore a supplier should not assume that a cured part is below the threshold without a direct extraction test on the finished article or representative production scrap. The test should account for part thickness, cure temperature, post-cure time, and filler content because each of these variables can change the extraction recovery and the apparent residual BPA concentration.

In practice, an injection moulder or composites fabricator should separate production lots by resin batch and cure recipe. If the resin certificate shows free BPA at 70 mg/kg and the matrix fraction in the composite is 60% w/w, the theoretical residual BPA concentration in the cured matrix is lower than the resin value after dilution by filler; however, this arithmetic conversion does not replace extraction testing because incomplete cure and extraction-resistant domains can introduce bias. The batch-to-batch variation of residual BPA in commercial DGEBA resins is not zero, and a supplier certificate that reports only “BPA-free” or “SVHC-free” without a detection limit is insufficient for Article 33 and SCIP compliance. The specification should require a limit of quantitation, the extraction recovery, and the identity of the analytical method.

Verifying Residual BPA in Liquid Resin and Cured Composite

For liquid resin, reversed-phase high-performance liquid chromatography with UV detection at 280 nm is widely used because BPA has a strong absorbance maximum near this wavelength. For cured epoxy matrices, liquid chromatography-tandem mass spectrometry offers better selectivity against epoxy oligomer interferences; the negative-ion transition m/z 227.1 → 212.1 is used for quantitation after deprotonation of BPA. The method detection limit should be reported, and the calibration curve should bracket the 1000 mg/kg article threshold; a method designed only for regulation of migration in food-contact materials may not be adequate for residual content determination in a filled composite. Extraction of BPA from cured epoxy is commonly performed with tetrahydrofuran or dichloromethane under sonication, but recovery must be validated using a matrix-matched spiked sample because BPA can partition into crosslinked domains and resist quantitative extraction. For food contact applications, CEN/TS 13130-13:2005 covers BPA migration testing, but for industrial cured articles no single ISO method covers all epoxy matrices. Supplier methods are therefore often based on validated in-house procedures with documented extraction recovery, chromatographic resolution, and measurement uncertainty. The certificate of analysis should report the extraction solvent, detection mode, recovery, and measurement uncertainty, not only a pass/fail result. If the reported value is near 0.1% w/w, the order should specify re-analysis by an independent laboratory using LC-MS/MS before an Article 33 declaration is issued.

SVHC Listing Is Not a Restriction for Epoxy Resin Imports

Candidate List status creates tracking, communication, and notification duties, but it does not impose a generic EU ban on importing or using BPA-based epoxy resins. The operative restriction for BPA under REACH remains limited to specific end uses such as thermal paper under Annex XVII entry 66. For an epoxy resin order, the practical consequence is that a supplier can continue to supply BPA-based liquid resins and cured articles, but the buyer must maintain Article 33 declarations, SCIP records, and analytical certificates for each article containing residual BPA above 0.1% w/w. This is a compliance burden concentrated at the article level; it does not rewrite the formulation of DGEBA resins. If future Annex XIV inclusion occurs, a separate authorisation process would be required, but that is not the present regulatory status.

To align a supply agreement with the BPA SVHC status, the purchase order should include a dedicated substance information clause that obliges the supplier to state free BPA content in mg/kg, the testing method, and the legal classification of the supplied product as substance, mixture, or article. The clause should require the supplier to notify in writing if residual BPA exceeds 0.1% w/w in any cured article supplied and to provide a SCIP submission number where applicable. For liquid resin drums, the specification should cap residual BPA at a level significantly below the article threshold to avoid passing the SVHC duty to downstream article producers; many commercial low-BPA liquid DGEBA grades are available with certificates showing free BPA below 100 mg/kg. The buyer should verify whether the supplier’s SDS Section 15.1 lists BPA among Candidate List substances and whether the epoxide equivalent weight, hydrolysable chloride, and viscosity are reported on the same certificate because these parameters together indicate the residual monomer and processing history of the resin. If the order covers an imported cured article, the EU importer should confirm that the SCIP dossier has been prepared under the correct material category, typically “organic compounds” or “plastics,” and that the article identity matches the customs declaration.