
Product Name: Optical Brightener ER-II / Fluorescent Brightener 199:1
Chemical Name: 2-[2-[4-[2-(4-Cyanophenyl)ethenyl]phenyl]ethenyl]benzonitrile
Color Index: C.I. 199:1
CAS: 13001-38-2
Molecular Formula: C₂₄H₁₆N₂
Formula Weight: 332.40 g/mol
Synonyms: Fluorescent Brightener 199:1; FBA 199:1; 1-(2-Cyanostyryl)-4-(4-cyanostyryl)benzene; 2,2′-[benzene-1,4-diyldi(E)ethene-2,1-diyl]dibenzonitrile; Optical Brightening Agent ER-II; 4,4′-(1,4-Phenylenediethene-2,1-diyl)dibenzonitrile; ER-2
Application:
Polyester Fibers (PET), Acetate Fibers, Polyamide Fibers (Nylon), Polyester-Cotton Blends, Polyester-Wool Blends, Polyester-Linen Blends, PVC, PS, Synthetic Leather, Coatings & Paints
1.Product Description
Achieve Superior Whiteness with Optical Brightener ER-II – The Low-Temperature, High-Performance Brightener for Polyester and Blends.
Optical Brightener ER-II, internationally designated as Fluorescent Brightener 199:1 (C.I. 199:1), is a premium distyrylbenzene derivative engineered specifically for whitening polyester fibers and their blends at lower processing temperatures than conventional ER-I . This sophisticated non-ionic brightener features a unique molecular structure with two cyanostyryl groups attached to a central benzene ring, delivering exceptional whitening performance with a bluish-violet fluorescence .
The key advantage of ER-II lies in its lower luminance temperature requirement, enabling effective whitening at reduced processing temperatures while achieving higher whitening performance than ER-I . This translates to energy savings and gentler processing conditions for heat-sensitive substrates.
Key differentiators:
Low-Temperature Whitening: Demonstrates excellent whitening efficacy at lower processing temperatures compared to ER-I, enabling energy-efficient operations.
Superior Whitening Performance: Delivers higher whitening intensity than ER-I at optimal application conditions.
Excellent Chemical Stability: Stable with hypochlorite, hydrogen peroxide, and reactive bleaching agents, enabling one-bath whitening and bleaching processes .
Non-Ionic Character: Insoluble in water but readily soluble in organic solvents, with excellent compatibility across various polymer systems.
Good Lightfastness: Rated Grade 5 for lightfastness, ensuring long-lasting whitening effects.
Our Optical Brightener ER-II is manufactured under strict quality controls with≥98.5% purity and consistent batch-to-batch performance, meeting international quality standards for textile and plastic applications .
2. Product Specifications (Technical Data Sheet)
| Property | Specification | Insight |
| Product Name | Optical Brightener ER-II (Fluorescent Brightener 199:1) | Premium distyrylbenzene brightener for polyester and blends |
| Appearance | Light yellow to yellowish-green crystalline powder | Free-flowing, uniform powder |
| CAS No. | 13001-38-2 | Verified chemical registry number |
| EINECS/EC No. | 235-834-6 | Listed in European inventory |
| Molecular Formula | C₂₄H₁₆N₂ | Distyrylbenzene structure |
| Formula Weight | 332.40 g/mol | |
| Solubility | Insoluble in water; soluble in most organic solvents (toluene, xylene, chlorobenzene, DMF) | Excellent organic solubility for polymer applications |
| Ionic Style | Non-ionic | Compatible with anionic and cationic systems |
| Fluorescence Color | Bluish-violet | Produces clean, bright white appearance |
| Maximum UV Absorption | 369 nm | Efficient absorption of near-UV radiation |
| Purity | ≥ 98.5% - 99.0% (HPLC) | High purity ensures consistent performance |
| Melting Point | 188-192°C | Excellent thermal stability for processing |
| Volatile Content | ≤ 0.5% | Low volatility during processing |
| Ash Content | ≤ 0.3% | High purity with minimal inorganic residues |
| pH Value (1% solution) | 6-9 | Neutral to slightly alkaline, stable across broad range |
| Lightfastness | Grade 5 (scale 1-8) | Excellent resistance to UV exposure |
| Storage Conditions | Store in cool, dry, ventilated warehouse; avoid sunlight and moisture | Shelf life: 2 years under proper storage |
| Packing | 25 kg fiber drums / cardboard cartons with PE inner liner; custom sizes available | Secure, moisture-proof packaging |
| Application | Polyester, acetate, polyamide fibers, polyester-cotton blends, PVC, PS, synthetic leather, coatings | Versatile across multiple industries |
3.Product Application
Textile Industry – Primary Application:
Optical Brightener ER-II is the preferred whitening agent for polyester and synthetic fibers, particularly valued for its low-temperature whitening capability and excellent performance in exhaust dyeing processes.
Plastics Industry:
ER-II demonstrates outstanding whitening performance across various plastic applications.
Coatings & Paints:
ER-II is suitable for coating applications, providing excellent whitening effects in solvent-based systems:
Industrial Coatings: Enhances whiteness and brightness.
Clear Lacquers: Masks yellowing in clear coatings.
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.