Shandong Huashang Chemical Co., Ltd. is a high-tech enterprise focused on industry of fine chemicals research and develop, produce and sale. Shandong Huashang Chemical Co., Ltd. is located in Shan Dong Ji Nan China. we have the ability to provide you high quality products. More than 90 % of our products are exported to developed countries and regions such as north America, Europe, Japan, South Korea and the Middle East.
Fluorescent Brightener KS-N (KSN)
1. Basic Information
Name: Fluorescent Brightener KS-N
Alias: Optical Brightener KSN, C.I. Fluorescent Brightener 368, FBA 368
Chemical Name: 4-(Benzoxazol-2-yl)-4′-(5-methylbenzoxazol-2-yl)stilbene / 5-Methyl-2,2'-(vinylenedi-p-phenylene)bisbenzoxazole
CAS No.: 5242-49-9
Molecular Formula: C29H20N2O2
Molecular Weight: 428.48
EINECS: 226-044-2
Category: Benzoxazole stilbene high-temperature resistant fluorescent whitening agent, plastic & polyester fiber additive
2. Physical and Chemical Properties
Physical Properties
- Appearance: Pale yellow-green fine crystalline powder
- Odor: Odorless
- Solubility: Insoluble in water, slightly soluble in hot aromatic solvents (toluene, xylene, DMF); insoluble in alcohols, aliphatic alkanes
- Melting Range: 335–345 °C (decomposes above 350 °C)
- Fluorescence Spectrum: Max absorption 374 nm, max blue-violet emission 434 nm
- Density: 1.26 g/cm3
- Hygroscopy: Non-hygroscopic under normal ambient humidity
- Aqueous Property: Completely insoluble in water, neutral inert solid
Chemical Properties
- Molecular Structure: Conjugated stilbene core linked with one unsubstituted benzoxazole and one 5-methylbenzoxazole, rigid conjugated system for high thermal stability
- Thermal Resistance: Excellent heat resistance, stable under 300 °C extrusion/injection molding, suitable for high-temperature polymer processing
- Light Fastness: Superior weather and UV resistance compared with OB-1, less fading under long-term outdoor exposure
- Compatibility: Good miscibility with polyester, PA, PC, ABS, PP, PET fiber; incompatible with cationic additives, strong acid & strong alkali
- Photostability: Only slight fluorescence attenuation under long UV irradiation
- Migration Resistance: Low migration, no blooming on plastic surface after molding
3. Main Application Fields
1. Engineering Plastic & General Plastic Whitening (Core Application)
ABS, PC, PET, PA, PP, AS resin, PVC, masterbatch, injection/extrusion film, plastic parts; small dosage (0.01%–0.05%) with strong whitening effect
2. Synthetic Fiber Whitening
Polyester, polyamide, acrylic fiber spinning whitening, added during polymerization or fiber drafting
3. Coatings, Inks & Adhesives
Blue-violet whitening for high-temperature baking coatings, solvent-based printing inks, hot melt adhesives
4. Laboratory Reference Standard
Chromatography standard for high-temperature plastic fluorescent brightener purity testing
4. Quality Specification Table
| Test Item | Standard Specification |
| CAS Number | 5242-49-9 |
| Molecular Formula | C29H20N2O2 |
| Appearance | Uniform yellow-green powder without agglomerates |
| HPLC Purity | Plastic Grade ≥99.0% |
| Volatile Matter | ≤0.50% |
| Melting Range | 335–345 °C |
| Fineness | ≥100 mesh |
| Relative Whitening Intensity | 98%–102% vs standard sample |
| Residue on Ignition | ≤0.10% |
| Heavy Metals (Pb) | ≤10 ppm |
| Packaging | 25kg PE-lined fiber drum / vacuum aluminum foil inner bag |
| Storage Condition | Hermetically sealed cool dry warehouse below 25 °C; avoid direct sunlight, separate from acidic/alkaline raw materials |
| Transportation Requirement | Common plastic auxiliary solid, moisture-proof sealed packaging, no mixed loading with strong acid |
| Shelf Life | 36 months under intact sealed storage |
Safety Warning
Mild irritant organic whitening powder. Dust irritates eyes, nasal tract and skin; long-term skin contact may cause temporary yellow staining and mild dry irritation. All operations shall be carried out in ventilated workshop with dust mask and chemical-resistant gloves. Avoid high-temperature open burning which releases irritant organic fumes. Waste solid belongs to general industrial organic waste, treated by licensed hazardous waste disposal institutions; waste solvent liquid recovered by distillation.
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