Product Description
Optical Brightener OB-1 (C.I. 393) is a high-purity bright yellow/green crystalline powder (≥99%) designed to enhance the whiteness and brightness of synthetic fibers, plastics, and foaming materials. Chemically known as 2,2′-(1,2-Ethenediyldi-4,1-phenylene)bisbenzoxazole, OB-1 provides a bluish tinge, effectively masking yellowness and producing a “whiter-than-white” appearance in finished products.
Advantages
- Produces whiter-than-white appearance with superior brightness
- Masks yellowness by adding a bluish tinge
- Environmentally friendly and non-toxic
- Excellent brightening ability in plastics, foaming, and coatings
- High thermal stability (melting point 357–359 °C) with low volatility (<0.5%)
Applications
Optical Brightener OB-1 (C.I. 393) is widely used in:
- Plastics & Foaming Materials: ABS, PS, HIPS, PA, PC, PP, hard PVC, polyolefin, PVC foaming, TPR, EVA, PU foaming
- Plastic Films & Laminates: Injection molding, lamination, and molded products
- Coatings & Natural Lacquer: Improves brightness and visual appeal
- Synthetic Fibers: Enhances whiteness and appearance of fibers
Special note: OB-1 shows excellent brightening efficiency in EVA and PE foaming plastics, making it ideal for specialty foamed products.
Physical & Chemical Properties
| Property | Specification |
|---|---|
| Product Name | Optical Brightener OB-1 (C.I. 393) |
| CAS Number | 1533-45-5 |
| EINECS Number | 216-245-3 |
| Other Name | 2,2′-(1,2-Ethenediyldi-4,1-phenylene)bisbenzoxazole |
| Molecular Formula | C28H18N2O2 |
| Appearance | Bright yellow / green crystalline powder |
| Purity | ≥99% |
| Melting Point | 357–359 °C |
| Volatile Matter | <0.5% |
Packaging
- 20 kg per carton
- 25/30 kg per fiber drum with PE liner
- Custom packaging available per customer requirements
Why Choose Optical Brightener OB-1 (C.I. 393)?
✅ High Brightening Efficiency: Especially effective for foaming plastics (EVA, PE) and synthetic fibers
✅ Bluish Tinge: Masks yellowing, giving products a cleaner, whiter look
✅ High Purity & Stability: Consistent performance in high-temperature processes
✅ Environmentally Safe: Non-toxic and eco-friendly
✅ Versatile Application: Suitable for plastics, films, laminates, coatings, and fibers
