DISODIUM DISTYRYLBIPHENYL DISULFONATE- ▸ Optical brightener: Fluorescent whitening agent in laundry detergents.
- ▸ Whiteness enhancement: Increases perceived whiteness and brightness of textiles.
- ▸ Formulation additive: Inert ingredient in non-food pesticide products.
A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.
Request SDS →Disodium distyrylbiphenyl disulfonate (Fluorescent Brightener 351, CBS-X; CAS 27344-41-8) is an anionic optical brightener — a fluorescent whitening agent (FWA). It absorbs invisible UV light and re-emits it as blue, which visually cancels yellowness and makes whites and colors look brighter and cleaner. It is water-soluble and is the standard brightener for liquid detergents. Identity: PubChem.
What is a fluorescent brightener?
A fluorescent whitening agent (FWA, or optical brightener) is a dye that fluoresces: it absorbs UV and emits visible blue light, adding apparent whiteness and brightness that compensates for the natural yellow cast of fabrics, paper and detergents. Disodium distyrylbiphenyl disulfonate (FB 351 / CBS-X) is a stilbene-type, anionic, highly water-soluble brightener especially suited to liquid detergent systems.
Applications by sector
Detergents & cleaning. The standard brightener in liquid laundry detergents and cleaners, deposited on fabric during the wash to boost whiteness. Paper. Brightening of paper and paperboard. Textile. Whitening in textile processing and finishing. Dose to the target whiteness; this describes the optical (brightening) function.
Forms and grades
Supplied as a powder or solution; confirm form and active content on the RFQ. The CoA documents the lot.
Handling and documentation
Each lot ships with a Certificate of Analysis (CoA); request the Safety Data Sheet (SDS) for handling data.
Bulk supply and RFQ
RawSource supplies disodium distyrylbiphenyl disulfonate in bulk to detergent, paper and textile manufacturers, with CoA and SDS per lot. Submit an RFQ with your form and target quantity.
Typical Properties
Typical reference values, not a specification; the Certificate of Analysis (CoA) for the lot governs.
| Property | Typical Value |
|---|---|
| Chemical Name | Disodium distyrylbiphenyl disulfonate (FB 351, CBS-X) |
| CAS Number | 27344-41-8 |
| Molecular Formula | C28H20Na2O6S2 |
| Type | Anionic stilbene optical brightener (FWA) |
| Appearance | Pale yellow-green powder or solution |
| Solubility | Highly water-soluble |
| Function | Optical brightening / fluorescent whitening |
| Handling | Refer to the current SDS |
Regulatory & registration requirements
- TSCA (US):
- REACH (EU):
- EC number: 248-421-0
Source: EPA TSCA Inventory (July 2025 release) · ECHA CHEM — retrieved 2026-07-12
Solutions Using This Product
Process-solution guides on this site that specify this chemistry:
- Optical Brightening & Whitening of Textiles (Textiles)
- Optical Brighteners (OBA/FWA) for Laundry Whiteness (Home & Industrial Care)
Frequently Asked Questions
What is disodium distyrylbiphenyl disulfonate used for?
It is an optical brightener (fluorescent whitening agent, FB 351 / CBS-X, CAS 27344-41-8) used mainly in liquid laundry detergents, and also in paper and textile processing, to make whites and colors appear brighter by converting UV light to visible blue.
How does an optical brightener work?
It absorbs ultraviolet light and re-emits it as visible blue fluorescence, which offsets the yellow cast of fabrics and paper so they look whiter and brighter to the eye.
What is the CAS and formula?
It is CAS 27344-41-8 (PubChem CID 5332133), molecular formula C28H20Na2O6S2. The CoA documents active content.
How is it supplied and quoted in bulk?
RawSource supplies it as a powder or solution in bulk with CoA and SDS per lot. Pricing is quote-based on form, active content and volume; submit an RFQ with your target quantity.
What is the REACH and TSCA regulatory status of Disodium Distyrylbiphenyl Disulfonate (Fluorescent Brightener 351)?
Disodium Distyrylbiphenyl Disulfonate (Fluorescent Brightener 351) (CAS 27344-41-8) is subject to U.S. TSCA Inventory requirements; supplying it into the EU requires valid REACH registration ((EC) No 1907/2006). RawSource cannot verify a third-party supplier's registrations — buyers should require documented TSCA and REACH compliance for their jurisdiction and volume (EC 248-421-0).