Fluorescent Brightener 351 | Bulk Optical Brightener

Name: Fluorescent Brightener 351 | Bulk Optical Brightener
SKU: S2487

CAS: 38775-22-3

SKU: S2487

Fluorescent Brightener 351 | SKU: S2487

Synonyms: C.I. Fluorescent Brightener 351; C.I. 482200; 4,4′-Bis(2-sulfostyryl)biphenyl

Fluorescent Brightener 351 (CAS 38775-22-3) is a stilbene-type optical whitening agent that Sarchem Labs supplies in bulk. Classed as a distyrylbiphenyl disulfonic acid derivative (C.I. 482200), it absorbs UV light and re-emits it as visible blue fluorescence, canceling the dull yellow cast of untreated cellulosic and synthetic substrates. Sarchem issues a COA and SDS with every lot.

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Specifications

Appearance	Colorless to pale yellow crystalline powder
Density	~1.414 g/cm³ (calculated)
Molecular Formula	C28H22O6S2
Molecular Weight	518.60 g/mol
SMILES String	C1=CC=C(C(=C1)C=CC2=CC=C(C=C2)C3=CC=C(C=C3)C=CC4=CC=CC=C4S(=O)(=O)O)S(=O)(=O)O
Refractive Index	1.688 (calculated)
CAS Number	38775-22-3
PubChem CID	33787
Colour Index Number	482200
InChIKey	SQAKQVFOMMLRPR-UHFFFAOYSA-N

Applications

Textile finishing (cotton, linen, silk, wool, blends)

Paper/pulp whiteness enhancement

Laundry detergent “blue-white” brightening

Plastics — offsets natural yellow tint

Leather processing/whitening

Product Description

What is Fluorescent Brightener 351?

Fluorescent Brightener 351 is a synthetic distyrylbiphenyl disulfonic acid compound that absorbs UV light and re-emits it as visible blue fluorescence, making textiles, paper, and detergent-treated fabrics look whiter. It’s built around a central biphenyl core flanked by two styryl-sulfonic acid arms.

Uses of Fluorescent Brightener 351

Dosed at low levels into processing baths, coatings, or finished products to counteract natural yellow tint. Textile mills apply it during wet processing; paper producers use it to lift pulp whiteness; detergent makers formulate it for the “brighter white wash” effect. Also used in plastics and leather finishing.