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What exactly is exempt: PEG or everything in the shipment?

Under Article 2(9) of REACH, polymers are exempt from the registration requirements in Title II. This is a specific exemption, not a declaration that polymers fall outside REACH altogether. A qualifying PEG polymer does not need its own registration dossier merely because its import volume exceeds the usual registration threshold.

However, Article 6(3) can require the manufacturer or importer of that polymer to register monomer substances or other substances incorporated into it. Separate substances present in a formulated PEG product may also require their own assessment.

For procurement purposes, the useful question is therefore not just “Is this PEG exempt?” It is “Which substance is exempt, and who covers any remaining registration obligations for this import route?”

How can a buyer establish whether a PEG grade is a polymer?

Article 3(5) of REACH defines a polymer by its molecular composition and molecular-weight distribution. In simplified terms, the substance must contain a simple weight majority of molecules with at least three monomer units covalently bound to at least one additional monomer unit or other reactant. It must also contain less than a simple weight majority of molecules of the same molecular weight.

The definition additionally describes molecules distributed over a range of molecular weights, with differences primarily attributable to differences in the number of monomer units. These conditions distinguish a polymeric distribution from a substance consisting predominantly of one discrete molecular species.

Commercial PEG grades commonly have a molecular-weight distribution, but the label “PEG” does not prove that a particular grade satisfies every element of the definition. Low-molecular-weight grades, narrow distributions, and products described loosely as polyethylene glycols deserve closer examination.

Is average molecular weight enough?

No. A nominal or average molecular weight helps identify a grade, but it does not show the weight fraction of qualifying polymer molecules or whether a single molecular weight dominates the substance. An average can conceal materially different distributions.

Ask the manufacturer for a grade-specific polymer-status statement supported by appropriate composition or molecular-weight-distribution evidence. Size-exclusion chromatography or other suitable analytical methods may contribute to that assessment, but a test report must be interpreted against the legal definition rather than treated as an automatic exemption certificate.

A CAS number is also insufficient on its own. It identifies a substance description; it does not replace assessment of the material actually manufactured and supplied.

When do PEG monomers require registration?

Article 6(3) establishes two cumulative thresholds for monomer substances or other substances incorporated into a polymer. Unless the relevant substance has already been registered by an actor up the supply chain, the polymer manufacturer or importer must assess registration where:

• The polymer contains at least 2% by weight of that monomer substance or other substance in the form of monomeric units and chemically bound substances.
• The total quantity of that monomer substance or other substance reaches at least one tonne per year for the relevant manufacturer or importer.

The assessment concerns each relevant substance, not simply the total mass of the PEG shipment. For annual tonnage, the responsible legal entity must consider its relevant aggregated quantities, rather than treating each delivery or purchase order as a separate threshold calculation.

Ethylene oxide is a key monomer to examine for PEG manufactured through ethylene oxide polymerization. Other reactants may also need assessment, depending on the manufacturing chemistry. The supplier should identify the actual substances used and their incorporated proportions; buyers should not infer a complete constituent list from a general PEG description.

Does the rule concern only residual, unreacted monomer?

No. This is a frequent source of incorrect declarations. The Article 6(3) assessment addresses monomer substances incorporated into the polymer as monomeric units. A low residual ethylene oxide result does not demonstrate that the registration obligation for chemically incorporated ethylene oxide has disappeared.

Residual-monomer testing remains relevant to product specifications and hazard assessment, but it answers a different question. A certificate of analysis showing low residual monomer cannot substitute for evidence of registration coverage.

Similarly, an upstream statement that a substance was registered only as an intermediate needs careful review. REACH does not allow the reduced intermediate-registration provisions to be used for monomers used in polymer manufacture in the same way as ordinary intermediates.

Who carries the obligation when PEG is purchased outside the EU?

The commercial seller and the legally responsible REACH actor are not necessarily the same company. An EU business importing PEG directly from a non-EU supplier generally needs to assess its own importer obligations unless the imports are validly covered by an Only Representative arrangement.

A qualifying non-EU manufacturer can appoint an EU-established Only Representative to fulfil relevant importer obligations. Where that arrangement properly covers the importing business, product, and quantities, the covered importer is treated as a downstream user for those obligations.

Do not assume that every exporter or trading company can appoint an Only Representative in its own right. The eligibility of the appointing entity and the relationship to the actual manufacturer must be established.

For a PEG shipment, request written confirmation identifying:

• The manufacturer and the exact grade covered by the arrangement.
• The Only Representative’s identity and confirmation that the importing legal entity is covered.
• The relevant monomer or other substance registrations and the basis for coverage.
• The quantities covered and how annual import volumes will be tracked.

A registration number copied from an unrelated supplier’s document does not establish coverage. The registration must be relevant to the substance and supply chain concerned. Purchasing the same nominal PEG grade from a different manufacturer can therefore require a new compliance review.

Which documents should be requested before approving a shipment?

A useful documentation package connects product identity, polymer status, and legal responsibility. It should allow the importer to explain why the PEG itself is exempt and how any non-exempt obligations are fulfilled.

1. Grade-specific identity and composition information. Obtain the commercial grade, substance identifiers, nominal molecular weight, and clarification of whether the product is a substance or a formulated mixture.
2. A reasoned polymer-status declaration. The declaration should reference the REACH polymer definition and identify the supporting basis. “PEG is a polymer” without grade-specific substantiation is weak evidence.
3. Constituent assessment. Request the identities and incorporated proportions needed to evaluate Article 6(3). Commercially sensitive information may require controlled disclosure to the importer, Only Representative, or regulatory adviser.
4. Registration or exemption evidence. Establish which relevant substances are registered upstream, covered through an Only Representative, below the applicable threshold, or subject to another substantiated exemption.
5. Supply-chain communication documents. Obtain an appropriate safety data sheet where required, together with relevant handling, restriction, and use information.

Check that the documents refer to the same manufacturer and grade. A declaration for one PEG range should not automatically be extended to modified PEGs, different end groups, blends, or products from another production source.

A supplier’s generic “REACH compliant” statement can support communication, but it is not a universal government-issued approval. Ask what the statement covers: polymer status, constituent registration, restrictions, or all of these. Its value depends on that scope and the evidence behind it.

Does registration exemption remove other EU chemical obligations?

No. Polymer exemption does not remove applicable REACH restrictions or supply-chain communication duties. Safety data sheets remain required where the legal conditions apply, and classification, labelling, and packaging must be assessed separately under the CLP Regulation.

Likewise, an exemption from registration is not evidence that a PEG grade is suitable for food, pharmaceutical, cosmetic, or another regulated application. Those uses can introduce separate purity, product-specific, and documentation requirements.

Review additives and co-formulated ingredients independently. A product marketed as “PEG solution” or “PEG blend” may contain substances whose registration position differs from that of the polymer. Conversely, not every trace impurity is automatically a separately registrable ingredient; its regulatory treatment depends on its role and the substance identity.

What should happen if the supplier cannot substantiate the exemption?

First establish what is missing. Lack of molecular-distribution evidence creates a polymer-status question. Missing monomer registration evidence creates a supply-chain coverage question. These require different corrective actions, and neither is resolved by issuing a broader compliance declaration.

For uncertain polymer status, obtain a technical assessment based on the actual grade. For unclear constituent coverage, have the importer or Only Representative reconcile substance identities, incorporated quantities, annual tonnage, and registrations before the affected import proceeds.

Escalate the assessment when manufacturing routes change, a new source is introduced, or the supplied material differs from the grade originally reviewed. Use the applicable REACH legal text and ECHA guidance on polymers and monomers to verify the position, including any amendments affecting the transaction. The release decision should rest on evidence tied to the material and importing legal entity—not on the PEG name alone.