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Optical Brightener OB-1
Optical Brightener CBS-X
Product Name: Optical Brightener CBS-X / Fluorescent Brightener 351
Chemical Name: Disodium 4,4′-bis(2-sulfostyryl)biphenyl
Color Index: C.I. 351
CAS: 27344-41-8
Molecular Formula: C₂₈H₂₀Na₂O₆S₂
Formula Weight: 562.56 g/mol
Synonyms: Fluorescent Brightener 351; Tinopal CBS-X; 4,4′-Bis(2-sulfostyryl)biphenyl disodium salt; Disodium 4,4′-bis(2-sulfonatostyryl)biphenyl; FBA 351; Optical Brightening Agent CBS-X; Calcofluor CG; Stilbene 3
Application:
Laundry Detergents (Powders, Liquids, Concentrates), Soaps & Soap Bars, Fabric Softeners, Textile Processing (Cotton, Linen, Polyamide, Wool, Silk), Paper Manufacturing, Bleaching & Dyeing Auxiliaries
Description
marker
1.Product Description
Achieve Superior Whiteness with Optical Brightener CBS-X – The Industry Benchmark for Detergent and Textile Whitening.
Optical Brightener CBS-X, internationally designated as Fluorescent Brightener 351 (C.I. 351), is a premium distyrylbiphenyl derivative recognized globally as the most excellent whitening agent for the detergent industry . This advanced disulfonic compound represents the gold standard in fluorescent whitening technology, delivering exceptional whiteness intensity and remarkable stability under demanding washing conditions.
The sophisticated molecular structure of CBS-X features a biphenyl core with two styryl-sulfonate groups that provide outstanding water solubility and superior affinity for cellulosic, polyamide, and protein fibers . Upon application, the compound absorbs invisible ultraviolet radiation in the 348-350 nm range and re-emits it as brilliant blue-violet visible light (maximum emission ~430-450 nm), effectively neutralizing the natural yellowish cast of fabrics and imparting a radiant, "whiter-than-white" appearance .
What truly distinguishes Optical Brightener CBS-X from conventional stilbene-based brighteners is its exceptional performance profile:
Superior Whitening Intensity: On cotton fabrics, CBS-X delivers up to 2.7 times the whitening efficacy compared to traditional bis(triazinylamino)stilbene derivatives . This exceptional efficiency translates directly to cost savings through reduced dosage requirements.
Exceptional Chlorine Bleach Stability: Unlike many conventional optical brighteners that degrade in the presence of hypochlorite, CBS-X exhibits outstanding stability with sodium hypochlorite, maintaining its whitening effect even in bleach-containing laundry formulations . This property makes it the preferred choice for modern detergent systems incorporating bleaching agents.
Excellent Solubility Profile: With solubility of 25 g/L in cold water (25°C) and 300 g/L in hot water (95°C), CBS-X dissolves rapidly and completely across all washing temperatures, ensuring uniform distribution and consistent whitening results .
Our Optical Brightener CBS-X is manufactured under strict quality controls with ≥99.5% purity, ensuring consistent batch-to-batch performance, minimal impurities, and compliance with eco-label standards including EU Ecolabel requirements . The product exhibits excellent biodegradability, meeting the growing global demand for environmentally responsible whitening solutions .
2.Product Specifications (Technical Data Sheet)
| Property | Specification | Insight |
| Product Name | Optical Brightener CBS-X (Fluorescent Brightener 351) | Premium distyrylbiphenyl brightener for detergents and textiles |
| Appearance | Light yellow-green to pistachio uniform powder or granules | Free-flowing, odorless solid with excellent dispersion characteristics |
| CAS No. | 27344-41-8 | Verified chemical registry number |
| EINECS/EC No. | 248-421-0 | Listed in European inventory |
| Molecular Formula | C₂₈H₂₀Na₂O₆S₂ | Disulfonic distyrylbiphenyl structure |
| Formula Weight | 562.56 g/mol | |
| Solubility (Water) | Cold water (25°C): ≥25 g/L; Hot water (95°C): ≥300 g/L | Exceptional solubility across all washing temperatures |
| Solubility (Other) | Slightly soluble in methanol and DMSO; insoluble in organic solvents | Hydrophilic nature ensures compatibility with aqueous systems |
| Style | Anionic / Distyrylbiphenyl Fluorescent Whitening Agent (FBA) | High-performance whitener for cellulosic and synthetic fibers |
| Maximum UV Absorption | 348-350 nm | Efficient absorption of near-UV radiation |
| Extinction Coefficient (1%) | 1105-1181 | High tinctorial strength ensures superior whitening efficiency |
| Purity | ≥ 99.5% (HPLC) | High purity ensures consistent performance and minimal impurities |
| Water Content | ≤ 3.5% | Low moisture content ensures stability and free-flowing properties |
| Water Insolubles | ≤ 0.5% | High purity with minimal residue |
| Melting Point | >300°C (decomposes) | Excellent thermal stability for processing |
| Density | 1.414 g/cm³ | |
| Packing | 25 kg cardboard drums/cartons with PE inner liner; 500 kg jumbo bags; custom sizes available | Secure, moisture-proof packaging to maintain product integrity |
| Storage Conditions | Store in cool, dry, ventilated warehouse; avoid moisture, heat, and direct sunlight; protect from acids and alkalis | Shelf life: 2 years under proper storage conditions |
| Application | Laundry detergents, soaps, fabric softeners, textiles, paper | Versatile across multiple industries |
3.Product Application
Detergent & Soap Industry – Primary Application:
Optical Brightener CBS-X is the undisputed leader for detergent and soap whitening applications. Its exceptional solubility, chlorine bleach stability, and superior whitening efficiency make it the preferred choice for all types of laundry formulations . The brightener can be incorporated into various detergent systems:
| Application Type | Recommended Dosage | Performance Notes |
| Common Laundry Powder | 0.005-0.03% (50-300 g per 1000 kg) | Standard dosage for regular washing powders |
| Concentrated Laundry Powder | 0.01-0.05% (100-500 g per 1000 kg) | Higher dosage for compact formulations |
| Liquid Detergents | 0.02-0.06% (200-600 g per 1000 kg) | Excellent solubility in liquid systems |
| Soap Bars / Laundry Soap | 0.01-0.05% (100-500 g per 1000 kg) | Uniform distribution in soap matrices |
| Fabric Softeners | 0.01-0.05% (100-500 g per 1000 kg) | Compatible with cationic softener systems |
| Washing Syrups / Pastes | 0.005-0.02% (50-200 g per 1000 kg) | Suitable for semi-liquid formulations |
Textile Industry:
CBS-X is extensively used in textile processing for whitening various fiber types :
Cotton & Linen: Delivers superior whitening intensity on cellulosic fibers, with efficacy up to 2.7 times higher than conventional stilbene derivatives . Suitable for both exhaust and pad applications.
Polyamide (Nylon): Provides excellent affinity and brightening effects for synthetic fibers.
Wool & Silk: Effective for protein fibers, delivering uniform whitening with good wash fastness.
Polyester-Cotton Blends: Compatible with one-bath whitening processes for blended fabrics .
Paper Industry:
In paper manufacturing, CBS-X is used for:
Pulp Whitening: Incorporated during the papermaking process to enhance the brightness of white papers and specialty grades .
Coating Applications: Suitable for paper coating formulations requiring high whiteness and brightness.
Key Performance Features:
Chlorine Bleach Resistance: CBS-X exhibits exceptional stability with sodium hypochlorite, maintaining whitening effectiveness even in bleach-containing formulations . This property is critical for modern detergents that combine cleaning and whitening functions.
Cold Water Efficiency: Unlike many conventional brighteners that require hot water for activation, CBS-X delivers excellent whitening results even with short washing times across a range of cold to medium temperatures .
High Wash Fastness: The brightener demonstrates excellent substantivity to fibers, ensuring that whitening effects persist through repeated washing cycles .
Good Light Fastness: Maintains whiteness stability under UV exposure, preventing yellowing during use and storage.
Biodegradability: The compound is designed for easy biodegradation, meeting stringent environmental requirements and eco-label standards.
4.Storage
This product may be stored up to two years in a sealed container. Containers should be kept tightly closed when not in use and stored in a cool, dry place.
5.Packaging
Usually is 25Kg/drum or paper box or bag with inner double PE liner Or provide customized packaging according to customer requirements.
6.Our advantage
1) Provide free samples for testing or comparing the effect difference and cost performance.
2) Fast response speed, customers' questions at any time will be responded to in two hours.
3) Fast delivery: the fastest delivery can be made on the same day.
4)Different packaging solutions: provide various packaging options according to customer requirements.
5)Technical guidance: provide improved whitening and coloring formulas and guidance according to customer production materials.
6) Sample retention or sample mailing before bulk delivery.
7) Providing certificationes, such as Reach certification.
8) Different payment methods: TT LC, etc.
9) Providing door-to-door DDP service.
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