Brightener CBS-X CAS 27344-41-8

Disodium-4,4'-bis(2-sulfostyryl)biphenyl

CAS Number: 27344-41-8
Chemical Name: Disodium 4,4′-bis(2-sulfostyryl)biphenyl
Molecular Formula: C28H23NaO6S2
Molecular Weight: 562.56
Appearance: Bright yellow-green powder/ particles, soluble in water
Maximum Absorption Wavelength: 348–350 nm, fluorescence is slightly blue-green

Fluorescent whitening agent 351 (CBS-X, CAS 27344-41-8) is an anionic, bis-styrene-biphenyl type optical whitening agent. It is mainly used in detergents and textiles to make white colors whiter, yellowish colors whiter, and to make them brighter and more transparent.

Item	Specification
CAS	27344-41-8
Chemical Name	Disodium 4,4′-bis(2-sulfostyryl)biphenyl
MF	C28H23NaO6S2
Application	Detergents (liquid laundry detergent / powder laundry detergent / soap), textiles, paper whitening

I. Cleaning Products (Main Uses)
Detergent: Concentrated type, ordinary liquid detergent, color-bleaching agent. Suitable for oxygen bleaching / chlorine bleaching formulas. Stable at low temperatures without precipitation.
Detergent powder: Ordinary detergent powder, phosphorus-free detergent powder, concentrated detergent powder. Enhances the whiteness of powder particles and the whiteness of the fabric after washing.
Soap products: Laundry soap, transparent soap, soap. Improves the yellowing of the soap and enhances the whiteness and brightness of the washed clothes.
Industrial cleaning agents: Brightener CBS-X, a fabric-specific industrial detergent for textiles, and hotel linen cleaning agent.
II. Textile Printing / Post-Treatment
Brightener CBS-X is suitable for cellulose fibers, synthetic fibers, and animal fibers for temperature-increased whitening:
Pre-treatment and post-dyeing whitening of cotton, linen, viscose fiber fabrics.
Whitening of blended fabrics such as polyester-cotton, cotton-jin.
Whitening of protein/polyamide fibers such as nylon, wool, and silk, without damaging the fibers.
Whitening of daily-use fabrics such as knitted fabrics, towels, bedding, underwear, and socks through water washing.
III. Paper Industry
Internal whitening of cultural paper, household paper (sanitary paper, face towel paper), and white board pulp.
Whitening of paper surface by applying sizing and color-mixing, with long-lasting whiteness and not prone to turning yellow.
IV. Other Special Applications
Cosmetics auxiliary materials： Some cleaning products， wash and care auxiliary systems for whitening.
Building materials / cosmetics powder： White powder raw materials， water-based paints， water-based adhesives (water-based systems) for whitening and brightening.

1. Cold water works: Room temperature / Cold water significantly improves whiteness without the need for high temperatures.
2. Resistant to bleaching: Resistant to chlorine bleaching and oxygen bleaching, suitable for laundry detergents containing bleaching agents.
3. Stable and non-dissolving: Stable in concentrated laundry detergents and laundry powders, does not easily precipitate.
4. Low dosage, high whiteness: Generally added at 0.01% – 0.3%, the effect is stronger than traditional varieties.
5. Resistant to yellowing: Good whiteness is maintained even after repeated washing.

25 kilograms per barrel: Hardwood barrel / Fiber barrel, lined with PE plastic bag.
Temperature: ≤ 30℃, store at room temperature, keep away from heat sources and open flames.
Humidity: Relative humidity ≤ 60%, strictly moisture-proof (will easily form lumps upon contact with water, affecting dispersion).
Lighting: Store in a cool and sealed environment, avoid direct sunlight (UV rays will reduce fluorescence efficiency).
Environment: Well-ventilated warehouse; away from strong oxidants, acids and alkalis; not to be mixed with food or medicine.
Shelf life: 24 months (2 years) (under sealed, cool, dry conditions).