REACH and DNQ Chemicals: What Buyers Should Ask Their Supplier
Buying DNQ under REACH? Questions to ask any supplier — registration status, CAS coverage, SDS, importer duties. Buyer-education guide — verify with documentation.
If you import DNQ actives into the European Union or supply EU downstream users, REACH (Registration, Evaluation, Authorisation and Restriction of Chemicals) is part of your procurement due diligence. REACH questions surface on every supplier questionnaire — often before technical qualification begins.
This article explains what REACH requires in the DNQ supply context and what questions to ask any supplier. It does not state any supplier's registration status. Verify every answer with documentation from the supplier you are evaluating.
What REACH is
REACH is the EU regulation governing manufacture, import, and use of chemical substances. Under REACH:
- Substances manufactured or imported into the EU at 1 tonne or more per year must be registered with the European Chemicals Agency (ECHA)
- Registration requires toxicity data, use information, and exposure scenarios
- The registration number and lead registrant for a substance appear in the ECHA database
- Safety Data Sheets (SDS) for registered substances must include the registration number when available
REACH applies to the substance (identified by CAS number or EC number), not to the supplier's factory accreditation. A supplier may manufacture in any country; the REACH obligation falls on the entity importing into the EU or the EU-based manufacturer.
Which DNQ CAS numbers fall under REACH scrutiny
Procurement teams sourcing DNQ actives typically handle these substances:
Complex polymers and reaction products may be registered under different REACH approaches (polymer exemption, monomer registration, or UVCB substance registration). The CAS number on your COA and SDS is the starting point for any REACH enquiry.
| Substance | CAS number | Typical Orion grade |
|---|---|---|
| 2-Diazo-1-naphthol-4-sulphonic acid, sodium salt | 64173-96-2 | Orion Freedom 2-1-4 |
| Esterified DNQ-cresol resin (one-pack) | 3770-97-6 | Orion Freedom Plus 1413 |
| DNQ-THBP ester polymers | Complex polymer (no single CAS) | P-1403, P-1610, P-3101, P-0711 |
Questions to ask any DNQ supplier
Use this question set on every supplier qualification — regardless of country of origin:
Registration status
- Is this substance (CAS number: ___) registered under REACH?
- What is the ECHA registration number?
- Who is the lead registrant or joint submission consortium?
- Is the registration valid for the tonnage band covering our import volume?
- If the substance is a polymer or UVCB, how is it identified in the REACH submission?
Documentation
- Does the SDS include a REACH registration number for this substance?
- Is the SDS compliant with Annex II of REACH (16-section format)?
- Does the COA reference the same CAS number as the SDS and registration?
- Can you provide an exposure scenario or safe-use information for our application (plate coating / photoresist formulation)?
Supply chain role
- Are you the EU manufacturer, the EU importer of record, or a non-EU exporter?
- If we import directly from outside the EU, do we become the importer of record with our own registration obligation?
- Can you supply only-non-EU, or do you have an Only Representative (OR) appointed for EU imports?
Tonnage and coverage
- At what annual tonnage is the substance registered?
- Does the registration cover our intended use (industrial plate coating / photoresist manufacture)?
- Are there any REACH restriction (Annex XVII) or authorisation (Annex XIV) entries affecting this substance?
If the supplier is not REACH-registered
A non-EU supplier may legitimately not hold EU REACH registration if they do not import into the EU themselves. In that case:
- The EU buyer importing the substance may need to register as an importer — or verify that an Only Representative covers the supply chain
- Downstream users in the EU must check that their use is covered by the supplier's (or importer's) registration exposure scenario
- SDS must still be provided — REACH registration and SDS provision are related but separate obligations
Do not assume that absence of registration means the substance cannot be supplied to the EU. It means the import compliance responsibility must be clearly assigned.
What Orion provides for regulatory review
Orion supplies DNQ actives with documentation that supports buyer-side regulatory review:
- COA per batch — with CAS number, assay, and batch identification
- MSDS / SDS — available per grade on request
- TDS — technical data sheets with application parameters
- Export documentation — with international shipments
Buyers should request the MSDS for their specific grade and CAS number, then cross-reference against their own REACH compliance workflow. For export paperwork context, see Exporting DNQ Chemicals From India.
REACH vs other compliance questions
REACH is one item on a procurement checklist. Related questions that apply to any DNQ supplier:
| Topic | What to ask | Orion article |
|---|---|---|
| GHS labelling | What hazard classification is on the MSDS? | DNQ GHS Classification |
| Export documentation | What paperwork accompanies the shipment? | DNQ Export Documentation |
| Supplier qualification | What batch docs and trial process? | DNQ Supplier Checklist |
Practical workflow for EU buyers sourcing DNQ from India
- Identify the CAS number for the grade you need
- Search the ECHA substance database for that CAS number
- Request MSDS and COA from the supplier — verify CAS match
- Ask the supplier the 15 questions above
- Determine whether you or the supplier hold the importer-of-record obligation
- Confirm your intended use is covered by the registration exposure scenario
- Proceed to technical qualification (trial batch) only after regulatory path is clear
Common questions.
Do DNQ chemicals need REACH registration?
Substances imported into the EU at 1 tonne or more per year require REACH registration. The obligation may fall on the EU manufacturer, the EU importer, or an appointed Only Representative — depending on the supply chain structure. Ask your supplier which entity holds the registration for the specific CAS number you are buying.
How do I check if a DNQ substance is REACH-registered?
Search the ECHA substance database using the CAS number from your supplier's COA and SDS. A valid registration shows a registration number, tonnage band, and lead registrant. Cross-reference the registration number against the SDS your supplier provides.
What should a REACH-compliant SDS for DNQ include?
A REACH-format SDS has 16 sections per Annex II. For registered substances, Section 1 should include the REACH registration number. The CAS number, hazard classification, and supplier identification must match the COA and purchase order.
Can I import DNQ from India without the supplier holding REACH registration?
Import compliance depends on who holds the importer-of-record obligation in the EU. A non-EU supplier may not be REACH-registered if they do not import into the EU directly. The EU buyer may need to register or verify coverage through an Only Representative. Resolve this before placing production orders — not after customs clearance.