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OBA IntermediatesCAS 81-11-8
DAS / DASDA
4,4′-Diaminostilbene-2,2′-Disulphonic Acid
Molecular Formula
C₁₄H₁₄N₂O₆S₂
Molecular Weight
390.40 g/mol
Appearance
Light yellow to cream crystalline powder
CAS Number
81-11-8
Synonyms:DASDASDADiaminostilbene disulphonic acid
Specifications
| Parameter | Specification |
|---|---|
| Appearance | Light yellow to cream crystalline powder |
| Purity (Diazotisation method) | Min. 93% |
| Free Amine | Max. 1.0% |
| Moisture | Max. 5.0% |
| Molecular Formula | C₁₄H₁₄N₂O₆S₂ |
| Molecular Weight | 390.40 g/mol |
Quality & Testing Methods
Diazotisation Titration
Sample dissolved in HCl, titrated with 0.1N NaNO₂, endpoint by starch-iodide paper
UV-Vis Spectrophotometry
Purity cross-check for OBA intermediates
Karl Fischer Titration
Moisture determination per ASTM E203
Applications
OBA synthesis intermediate
Fluorescent whitening agents for paper
Textile fluorescent brighteners
Detergent additive precursors
Packaging
- 25 kg HDPE bags
- 50 kg HDPE bags
- Jumbo bags (500/1000 kg)
Labelling: GHS/REACH compliant labelling. Export packaging available.
Incoterms: FOB Dahej/Nhava Sheva, CIF, CFR available.
Shipping
- Export to EU, USA, South-East Asia, Middle East, Africa
- GHS-compliant Safety Data Sheets (SDS) provided
- UN dangerous goods classification as applicable
- COA (Certificate of Analysis) with every shipment
Safety Information
Signal Word
Warning
Hazard Classification
Irritant, Sensitizer
GHS Pictograms
GHS07 – Exclamation Mark
Storage Conditions
Store in cool, dry, dark area. Protect from light and moisture.
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