Para Nitrotoluene Ortho Sulphonic Acid: direct from source to Europe
Para Nitrotoluene Ortho Sulphonic Acid (CAS 121-03-9), known in the trade as PNTOSA, is a sulfonated nitrotoluene used as an intermediate for azo dyes, optical brighteners and specialty sulfonated aromatics.
- COA, SDS & TDS with every batch
- REACH status confirmed before quote
- Samples available for qualification
Para Nitrotoluene Ortho Sulphonic Acid: names, synonyms and identifiers
Buyers search for this material under several names. Whichever one appears on your specification, purchase order or REACH dossier, it is the same compound: Para Nitrotoluene Ortho Sulphonic Acid, CAS 121-03-9.
- Confirmed CAS number on every COA
- Premium grade with assay 98%+ available
- TDS and SDS supplied with every shipment
⚠ PNTOSA is an industry trade name for 4-nitrotoluene-2-sulfonic acid; it is supplied as the free acid or, on request, as the sodium salt. Always match CAS 121-03-9.
Para Nitrotoluene Ortho Sulphonic Acid physical and chemical properties
Key parameters for process engineering, safety planning and storage design. Values are typical; always verify against the current TDS for your lot.
Para Nitrotoluene Ortho Sulphonic Acid grade specifications: standard vs premium
Two grades are offered so your process chemist or quality team can pick what suits downstream requirements. COA parameters are confirmed before every shipment.
All values are specification limits, not guaranteed minima. Actual COA figures for your lot are provided before dispatch. Non-standard specifications are available on enquiry.
Where Para Nitrotoluene Ortho Sulphonic Acid is used
Typical end uses and synthesis routes for European manufacturers, toll processors and laboratories.
Azo dye intermediate
Diazo component for water-soluble azo dyes.
Optical brightener intermediate
Sulfonated building block for stilbene-type brighteners.
Specialty sulfonated aromatics
Feed for further reduction to amino-sulfonic acid derivatives.
Custom synthesis
Starting material for contract synthesis of nitrotoluene sulfonic acid derivatives.
Packed to your site, documented for customs
Para Nitrotoluene Ortho Sulphonic Acid is handled as a dangerous good. Every shipment leaves with UN-approved packaging, CLP labelling and the full document set for European import.
25 kg bags
UN-approved bags or lined fibre packs on pallets, suitable for FCL and LCL.
25 kg net200 kg drums
UN-approved steel or fibre drums for higher volume users.
200 kg netJumbo bags / bulk
Bulk bags for high-volume users, supplied on request for suitable receiving sites.
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View product →Para Nitrotoluene Ortho Sulphonic Acid: frequently asked questions
Quick answers for European buyers. For anything else, email source@cheloragroup.com.
It is also sold as PNTOSA, 4-Nitrotoluene-2-sulfonic acid, 4-Methyl-3-nitrobenzenesulfonic acid. All refer to CAS 121-03-9. Confirm the CAS number with any supplier before ordering.
Price depends on grade, volume, packing, Incoterm and destination port, and moves with raw material markets. Send us your requirement and we will quote in EUR or USD with a landed-cost breakdown, usually within one business day.
Para Nitrotoluene Ortho Sulphonic Acid (CAS 121-03-9), known in the trade as PNTOSA, is a sulfonated nitrotoluene used as an intermediate for azo dyes, optical brighteners and specialty sulfonated aromatics.
Standard grade offers 96.0% minimum HPLC assay. Premium grade offers 98.0% minimum with lower water content and ash. Premium is recommended for optical brightener routes needing tight impurity control.
We supply Para Nitrotoluene Ortho Sulphonic Acid primarily as the free acid. The sodium salt can be supplied on request; tell us which form your process needs, and confirm you mean CAS 121-03-9 rather than a related nitrotoluene sulfonic acid isomer.
Aromatic amines can face REACH, CLP and workplace-exposure obligations depending on use. We confirm the current status for your application before quoting.
Store sealed in a cool, dry place, away from moisture, strong bases and reducing agents. Use within the shelf life stated on the COA and TDS.
It is treated as a dangerous good (class and UN number per SDS; always confirm on the current SDS). We pack it in UN-approved containers, apply CLP labels and ship through licensed forwarders under IMDG for sea and ADR for European road.
Yes. Laboratory and pilot samples are supplied with a COA and SDS so your team can qualify the grade. Mention sample needs in your enquiry.
REACH status is confirmed before we quote. We advise on importer-of-record arrangements and whether the substance is registered for your use. Send your use descriptor and we will confirm.
Get your Para Nitrotoluene Ortho Sulphonic Acid quotation today
Send us the grade, volume, destination and Incoterm. You will receive a clear price, packaging options and a full document checklist, usually within one business day.
- Samples to full containers
- COA, SDS and DG documents included as standard
- Quote in EUR or USD, your choice of Incoterm