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 367
1. Basic Information
Name: Fluorescent Brightener 367
Alias: Optical Brightener KCB, 1,4-Bis(2-benzoxazolyl)naphthalene, 2,2'-(Naphthalene-1,4-diyl)bis(benzoxazole)
CAS No.: 5089-22-5
Molecular Formula: C24H14N2O2
Molecular Weight: 362.38
Category: Benzoxazole optical brightening agent, plastic & fiber functional chemical additive, fine chemical auxiliary
2. Physical and Chemical Properties
Physical Properties
- Appearance: Yellow-green crystalline powder
- Odor: Odorless, non-toxic
- Solubility: Insoluble in water; freely soluble in toluene, acetone, xylene, DMF, PVC resin; slightly soluble in methanol, ethanol, isopropanol
- Melting Point: 210–212 ℃
- Boiling Point: 521.9 ℃ (760 mmHg)
- Density (20℃): 1.32 g/cm3
- Flash Point: 263.1 ℃
- Spectral Property: Max UV absorption wavelength 370 nm, max fluorescence emission wavelength 437 nm, bright blue-white fluorescent shade
- Hygroscopy: Non-hygroscopic under normal humidity
- Aqueous property: Completely insoluble in water, stable in neutral and weak acid environments
Chemical Properties
- Molecular structure: Naphthalene skeleton linked with two benzoxazole heterocyclic groups, fully conjugated aromatic system with strong fluorescence effect
- Thermal stability: Excellent heat resistance, stable under plastic extrusion/injection molding high temperature processing, no decomposition or discoloration
- Light stability: Superior weather and light fastness, long-term outdoor use without fading yellowing
- Compatibility: Good miscibility with polyolefin, PVC, EVA, PS, ABS, polyester fiber; no migration, no bleeding out, no reaction with foaming agents, crosslinkers
- Photostability: Slightly sensitive to strong UV long-term irradiation, avoid long-term direct sunlight storage
- Compatibility limit: Incompatible with strong oxidants, concentrated strong acid
3. Main Application Fields
1. Plastic Whitening & Brightening (Core Application)
Special whitener for EVA foam shoe materials, PE/PP plastic film, injection molding parts, PVC soft/hard products, ABS, polystyrene transparent plastic; low dosage delivers obvious blue-white brightening effect, eliminates yellow base tone
2. Synthetic Fiber Auxiliary
Whitening additive for polyester, polyamide fiber spinning masterbatch, improves fabric vividness and whiteness
3. Coating & Ink Raw Material
Optical brightener for solvent-based industrial paint, printing ink, plastic coating to enhance surface gloss
4. Rubber & Thermoplastic Elastomer
Brightening agent for thermoplastic rubber, silicone rubber products, improves product surface brightness
4. Quality Specification Table
| Test Item | Standard Specification |
| CAS Number | 5089-22-5 |
| Molecular Formula | C24H14N2O2 |
| Appearance | Uniform yellow-green crystal powder without dark impurities |
| HPLC Purity | Industrial Grade ≥98.0% |
| Melting Point | 210–212 ℃ |
| Ash Content | ≤0.50% |
| Water Content (KF) | ≤0.20% |
| Fineness (325 mesh pass rate) | ≥98.0% |
| Heavy Metals (Pb) | ≤10 ppm |
| Packaging | 25kg PE lined woven bag, 25kg light-proof fiber drum |
| Storage Condition | Hermetically sealed cool dry warehouse below 25 ℃, full light shielding, isolate oxidizing substances |
| Transportation Requirement | Light-sensitive plastic additive powder, moisture-proof sealed packaging |
| Shelf Life | 36 months under sealed storage |
Safety Warning
Low-toxicity mild irritant fine chemical powder. Dust irritates eyes, nasal tract and respiratory mucosa; long-term skin contact may cause slight dry itching. All operations must be carried out in ventilated fume hood with dust-proof respirator and nitrile gloves. Avoid mixing with strong oxidants to prevent oxidative discoloration. Waste solid can be recycled after separation; residual waste classified as general polymer auxiliary hazardous waste disposed by licensed professional institutions.
