GHS Classification and Hazard Labeling for DNQ Actives
DNQ GHS hazard classification — what to verify on your supplier's MSDS per grade and CAS. Not a supplier certification claim. Request Orion MSDS.
Every DNQ shipment crossing a border or entering a pressroom storage area needs a Material Safety Data Sheet (MSDS) or Safety Data Sheet (SDS) with GHS hazard classification. Procurement and EHS teams use that document for labelling, transport classification, storage segregation, and worker training.
This article explains what GHS classification means for DNQ actives, what to verify on a supplier's MSDS, and where hazard information comes from. GHS classification describes properties of the substance — it is not a claim that the supplier holds a third-party GHS certification.
What GHS classification is
The Globally Harmonized System (GHS) standardises how chemical hazards are communicated:
- Hazard classes — physical hazards (flammability, reactivity) and health hazards (toxicity, sensitisation, carcinogenicity)
- Hazard statements (H-codes) — standardised phrases describing the hazard (e.g. H315: Causes skin irritation)
- Precautionary statements (P-codes) — handling, storage, and disposal guidance
- Pictograms — diamond-shaped symbols on labels and SDS Section 2
The classification is determined by the supplier based on available toxicity and physical-property data for the specific substance or mixture they supply. Different grades of DNQ chemistry may carry different classifications.
Why DNQ hazard classification varies by grade
Orion supplies DNQ actives across a range of chemical forms:
A sodium salt, a resin ester, and a ready coating solution have different compositions, different solvent content, and potentially different hazard profiles. Do not apply one DNQ MSDS to all grades. Request the MSDS for the exact grade and CAS number you are purchasing.
| Grade | Chemical form | CAS |
|---|---|---|
| Freedom 2-1-4 | Water-soluble sodium salt | 64173-96-2 |
| Freedom Plus 1413 | Esterified DNQ-cresol resin | 3770-97-6 |
| DNQ-THBP grades | Esterified polymer PAC | Complex polymer |
| Orion Next | Multi-polymer coating solution | Multi-polymer |
What to verify on a DNQ MSDS
When reviewing a supplier's MSDS for DNQ actives, check these sections:
Section 1 — Identification
- [ ] Product name matches your purchase order grade
- [ ] CAS number matches your COA
- [ ] Supplier name and emergency contact are current
Section 2 — Hazard identification
- [ ] GHS hazard classification stated (not blank or "not classified" without justification)
- [ ] Hazard pictograms listed
- [ ] H-statements and P-statements present
- [ ] REACH registration number (if applicable to your supply chain — see REACH buyer guide)
[NEEDS VERIFICATION: Specific GHS hazard class, H-statements, and pictograms for each Orion grade — must be taken from Orion's actual MSDS documents. MSDS PDFs are referenced on product pages but specific hazard classifications are not reproduced in this article to avoid mismatch with current MSDS revisions.]
Section 7 — Handling and storage
Orion's published storage guidance across grades:
- Cool, dry place
- Protect from direct light, moisture, and UV
- Keep containers sealed
- Yellow safe light for coating-grade handling
Cross-reference Section 7 against Orion's published storage guidance. Discrepancies between MSDS and product data sheet should be raised with the supplier.
Section 14 — Transport information
- UN number (if classified as dangerous goods)
- Transport hazard class
- Packing group
- Environmental hazard classification
[NEEDS VERIFICATION: UN number and transport class per Orion grade — confirm from grade-specific MSDS and your freight forwarder.]
GHS labelling requirements for your facility
Once you have the supplier's MSDS, your EHS team applies GHS labelling to:
- Incoming containers — pictograms, signal word, H-statements, supplier identity
- Internal storage — secondary containers decanted in the pressroom or fab
- Shipping — if you re-ship or distribute the material downstream
Label content must match the MSDS for the specific batch and grade. If the supplier revises the MSDS (new hazard data, regulatory update), update your labels accordingly.
DNQ-specific handling hazards (general)
DNQ compounds share some handling characteristics across grades, based on established DNQ chemistry:
- Light sensitivity — decomposition under UV and white light (not a GHS class, but a critical handling requirement). See DNQ Storage and Safe-Light Handling.
- Moisture sensitivity — sodium salt grades absorb moisture; controlled at 2.5% max on Orion COA
- Dust exposure — powder grades may require dust-control measures during weighing and dissolution
[NEEDS VERIFICATION: Whether Orion's MSDS classifies DNQ powder grades under specific inhalation or skin-contact H-codes — confirm from grade-specific MSDS, not general DNQ literature.]
General DNQ literature may cite hazard categories that do not match a specific supplier's MSDS for their specific grade formulation. Always use the supplier's MSDS as the authoritative source.
Orion MSDS availability
Orion provides MSDS per grade:
MSDS documents are available for download from product pages or by email to sales@orionppp.com. Request the MSDS for your specific grade before placing a trial order — do not rely on a generic DNQ hazard summary.
| Grade | MSDS availability |
|---|---|
| Orion Freedom 2-1-4 | MSDS on product page / on request |
| Orion Freedom Plus 1413 | MSDS on product page / on request |
| Orion P-1403, P-1610, P-3101, P-0711 | Request per grade |
| Orion Next | Request from sales |
GHS classification vs supplier certification
Orion provides MSDS per grade as documentation — not as a certification held. Your EHS review of the MSDS content is the compliance step.
| Concept | What it is | What it is not |
|---|---|---|
| GHS hazard classification | Property of the substance, stated on MSDS | Proof that the supplier is "GHS certified" |
| MSDS provision | Documentation the supplier provides per grade | Third-party accreditation or audit badge |
| COA | Batch quality data (assay, moisture) | Hazard classification document |
Common questions.
What GHS hazard class applies to DNQ actives?
Hazard classification depends on the specific grade and formulation. Request the MSDS for the exact Orion grade and CAS number you are purchasing. Do not apply a generic DNQ hazard classification across different salts, esters, and coating solutions.
Where do I get the MSDS for Orion DNQ grades?
MSDS documents are available on Orion product pages or by request to sales@orionppp.com. Each grade — Freedom 2-1-4, Freedom Plus 1413, P-series, and Orion Next — has its own MSDS.
Is GHS classification the same as REACH registration?
No. GHS classification describes hazard properties communicated on the SDS. REACH registration is a separate EU obligation for substances imported at 1 tonne or more per year. Both may appear on the same SDS but serve different regulatory purposes. See REACH and DNQ Chemicals.
Should I use general DNQ hazard data or the supplier MSDS?
Always use the supplier's MSDS for the specific grade you are handling. General DNQ literature may not match the hazard classification for a specific formulation, solvent content, or purity grade.