REACH and RoHS: Navigating Europe's Parallel Substance Restriction Frameworks for Rubber and Polymer Compounds

REACH (Registration, Evaluation, Authorisation and Restriction of Chemicals) and RoHS (Restriction of Hazardous Substances) represent two distinct European regulatory frameworks that impose overlapping but non-identical substance restrictions on rubber and polymer manufacturers. REACH Annex XVII lists banned and restricted substances across all articles and mixtures, while RoHS specifically targets electrical and electronic equipment with concentration limits for ten named substances. For a compounder selling elastomeric components into European supply chains — cable jackets, automotive seals, medical device housings — compliance requires mapping formulation ingredients against both frameworks simultaneously. A substance compliant under RoHS may still trigger REACH restriction. A material cleared for REACH Annex XVII may fail RoHS if it ends up in a covered product category.

REACH Annex XVII: Substance-Specific Restrictions Across All Article Types

REACH Annex XVII consolidates substance restrictions under a single regulatory appendix maintained by the European Chemicals Agency. As of the most recent update cycle, Annex XVII contains over 70 entries, each specifying banned or restricted substances, concentration thresholds, exemptions, and compliance deadlines. For rubber compounders, several entries impose direct restrictions on common formulation ingredients:

Polycyclic Aromatic Hydrocarbons (PAHs)

Entry 50 restricts eight PAHs in rubber and plastic articles intended for direct and prolonged skin contact or oral contact. The restricted PAHs include benzo[a]pyrene (BaP), benzo[e]pyrene, benzo[a]anthracene, chrysene, benzo[b]fluoranthene, benzo[j]fluoranthene, benzo[k]fluoranthene, and dibenzo[a,h]anthracene. Entry 50 carries two distinct provisions, and the wrong one is easy to apply. For consumer articles whose rubber or plastic components come into direct, prolonged, or repetitive contact with skin or the mouth, the limit is 1 mg/kg for each of the eight PAHs individually — 0.5 mg/kg for toys and childcare articles — with no aggregate sum threshold. A separate provision governs extender oils used in tyre production: those may not exceed 1 mg/kg benzo[a]pyrene or 10 mg/kg for the sum of the eight listed PAHs. A compounder must apply the provision that matches the end use; treating the tyre-oil sum limit as the article limit understates the restriction on consumer goods. Carbon black — a standard reinforcing filler in tire compounds, conveyor belts, and industrial hoses — carries trace PAH contamination from the manufacturing process. Without supplier certificates or independent lab analysis verifying PAH content, a compounder cannot confirm Entry 50 compliance.

Phthalates

Entry 51 restricts four phthalates (DEHP, DBP, BBP, DIBP) in articles at concentrations above 0.1% by weight. Entry 52 extends restrictions to additional phthalates in articles that can be placed in the mouth by children. Flexible PVC compounds and plastisol-coated textiles historically relied on DEHP as a primary plasticizer; rubber formulations may incorporate phthalates for processing or flexibility enhancement. A gasket or seal intended for food contact or medical use falls under Entry 51 regardless of application — the restriction is substance-concentration triggered, not use-case triggered.

Lead and Lead Compounds

Entry 63 restricts lead in articles supplied to the general public if the lead concentration exceeds 0.05% by weight and the article can reasonably be placed in the mouth by children. Rubber compounds for toys, footwear, or consumer goods require ingredient-level screening for lead stabilizers, pigments, or contamination from recycled feedstock. Entry 30 separately restricts lead in jewelry articles at 0.05% by weight.

TreadCheck's REACH screening module flags formulation ingredients against all active Annex XVII entries, with substance-CAS mapping and concentration threshold checks automated at the ingredient level.

RoHS: Concentration Limits for Electrical and Electronic Equipment

The RoHS Directive (2011/65/EU, recast as 2015/863/EU) restricts ten substances in electrical and electronic equipment placed on the EU market. Unlike REACH's article-agnostic approach, RoHS scope is product-category constrained: it applies to equipment categories listed in Annex I (household appliances, IT equipment, lighting, toys, medical devices, industrial monitoring instruments). The ten restricted substances are:

• Lead (Pb) — 0.1% by weight in homogeneous materials
• Mercury (Hg) — 0.1%
• Cadmium (Cd) — 0.01%
• Hexavalent chromium (Cr(VI)) — 0.1%
• Polybrominated biphenyls (PBB) — 0.1%
• Polybrominated diphenyl ethers (PBDE) — 0.1%
• Bis(2-ethylhexyl) phthalate (DEHP) — 0.1%
• Butyl benzyl phthalate (BBP) — 0.1%
• Dibutyl phthalate (DBP) — 0.1%
• Diisobutyl phthalate (DIBP) — 0.1%

For rubber and polymer manufacturers, RoHS exposure arises when elastomeric components — cable insulation, gaskets, seals, O-rings, housings, keypads, grommets — are incorporated into covered equipment. A silicone gasket for a medical device, a fluoroelastomer seal for an industrial sensor, or a thermoplastic elastomer cable jacket for consumer electronics all require RoHS compliance verification. The homogeneous-material rule is critical: compliance is assessed at the material level, not the finished-article level. A multi-layer cable jacket with a lead-contaminated inner layer fails RoHS even if the composite article's average lead concentration is below 0.1%.

Overlap and Divergence: Where REACH and RoHS Conflict

REACH and RoHS overlap on four phthalates (DEHP, DBP, BBP, DIBP) and lead, but their scope, thresholds, and exemptions differ. A rubber compound compliant under RoHS may still fail REACH:

The divergence creates dual-compliance exposure. A thermoplastic elastomer for a consumer appliance housing must meet RoHS's 0.1% lead limit (if EEE-scope) and REACH Entry 63's 0.05% lead limit (if general-public article with mouth-contact risk). A rubber seal for a medical device must meet RoHS (Category 8 EEE) and REACH Entry 50 (if skin contact). The compounder cannot rely on a single test report or supplier declaration — both frameworks require independent verification.

The SVHC Candidate List and Authorization: REACH's Separate Notification Track

REACH's Substances of Very High Concern (SVHC) Candidate List operates parallel to Annex XVII. The Candidate List is maintained by ECHA and updated on a roughly twice-yearly cycle, so the authoritative count is always the live list ECHA publishes rather than any figure quoted at a point in time. Any article containing a listed SVHC above 0.1% by weight triggers two obligations:

1. Communication in the supply chain: The supplier must inform recipients and consumers, on request, about the presence of the SVHC within 45 days.
2. SCIP database notification: For articles containing SVHCs above 0.1% placed on the EU market, manufacturers and importers must submit notifications to ECHA's SCIP database.

SVHCs do not carry concentration limits for use (unlike Annex XVII restrictions), but they trigger authorization requirements if they migrate to Annex XIV. Authorization means the substance cannot be used without a specific ECHA-granted authorization, a procedural and cost barrier few compounders can justify for standard formulations. Several rubber-relevant substances appear on the Candidate List:

• Bisphenol AF (BPAF, CAS 1478-61-1) — used in fluoroelastomer polymerization
• Medium-chain chlorinated paraffins (MCCPs, C14-17) — used as flame retardants and plasticizers
• Diisohexyl phthalate (CAS 71850-09-4) — plasticizer in flexible compounds
• Dicyclohexyl phthalate (DCHP, CAS 84-61-7) — plasticizer

A compounder using BPAF in a fluoroelastomer formulation for automotive fuel-line seals must notify SCIP if the finished seal exceeds 0.1% BPAF by weight. If BPAF migrates to Annex XIV (as several phthalates already have), the compounder faces authorization or formulation replacement.

Compliance Workflow: Parallel Screening and Declaration Management

Operationally, REACH and RoHS compliance for rubber formulations requires:

Ingredient-Level Substance Identification

Every raw material — polymer, filler, plasticizer, stabilizer, accelerator, antioxidant — must be mapped to a CAS number or REACH registration number. Supplier declarations (REACH compliance statements, RoHS declarations of conformity) are not sufficient; they attest to compliance but do not disclose composition. Without CAS-level ingredient data, the compounder cannot screen against Annex XVII entries, RoHS restricted substances, or the SVHC Candidate List.

Concentration Threshold Calculation

REACH and RoHS thresholds are weight-percentage based, calculated at the homogeneous-material level (RoHS) or article level (REACH). A formulation with 0.08% lead in a single component layer fails RoHS even if the bulk article's average lead content is 0.05%. The compounder must calculate worst-case concentrations per layer or homogeneous material, not bulk averages.

Declaration Compilation

For every finished article, the compounder must compile: a RoHS declaration of conformity (if EEE-scope), a REACH Article 33 communication (if SVHC >0.1%), and a SCIP notification (if SVHC >0.1% and article placed on EU market). The declarations require substance CAS numbers, concentration data, and test-report references. Missing or inconsistent declarations expose the manufacturer to enforcement action at the EU customs border or in post-market surveillance audits.