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OBA IntermediatesCAS 128-42-7

DNS / DNSDA

4,4′-Dinitrostilbene-2,2′-Disulphonic Acid

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Molecular Formula

C₁₄H₁₀N₂O₁₀S₂

Molecular Weight

450.36 g/mol

Appearance

Yellow crystalline powder

CAS Number

128-42-7

Synonyms:DNSDNSDADinitrostilbene disulphonic acid

Specifications

ParameterSpecification
AppearanceYellow crystalline powder
Purity (Reduction method)Min. 90%
MoistureMax. 5.0%
Molecular FormulaC₁₄H₁₀N₂O₁₀S₂
Molecular Weight450.36 g/mol

Quality & Testing Methods

UV-Vis Spectrophotometry

Purity cross-check and colour measurement for OBA intermediates

Karl Fischer Titration

Moisture determination per ASTM E203

HPLC

Purity determination — C18 column, UV detector at 280 nm

Applications

Stilbene-based Optical Brightening Agents (OBAs)
Detergent industry fluorescent whitening agents
Textile brightening agents
Paper and plastics brighteners

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

GHS Pictograms

GHS07 – Exclamation Mark

Storage Conditions

Store in cool, dry, dark area. Protect from light and moisture.

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