Fluorescent Brightener 378 / Optical brightener CBS-127 cas 40470-68-6
Product Name: 4,4′-Bis(2-Methoxystyryl)biphenyl / Fluorescent Brightener CBS-127/ fluorescent Brightener 378
CAS No: 40470-68-6
Molecular Formula: C30H26O2
Molecular Weight: 418.53
Appearance:White to greencrystalline powder
Purity: 99%
Fluorescent Brightener 378 / Optical Brightener CBS-127 (CAS 40470-68-6) Comprehensive Guide
Table of Contents
1. Product Overview & Key Specifications
Fluorescent Brightener 378 (CBS-127), CAS 40470-68-6, is a high-performance stilbene derivative widely used in polymer and textile industries. Its molecular formula is C30H26O2 with a molecular weight of 418.53 g/mol.
| Parameter | Value | Competitor Comparison |
|---|---|---|
| Appearance | White to off-white powder | Superior whiteness vs. OB-1 |
| Melting Point | 216-222°C | Higher thermal stability than KSN |
| Density | 1.134 g/cm³ | Optimal for polymer blending |
| Refractive Index | 1.676 | Enhanced light dispersion |
2. Industrial Applications & Functional Advantages
Core Applications:
- Plastics Manufacturing: PVC, PS, ABS with 0.01-0.05% loading prevents yellowing
- Textile Processing: 0.1-0.3 g/L in synthetic fiber treatment
- Coatings Industry: UV-resistant formulations for automotive paints
- Cosmetic Additives: NSF-approved for personal care products
Performance Benefits:
- 98% UV absorption at 340-370 nm wavelength
- Maintains efficacy at processing temperatures ≤300°C
- Non-migrating formula ensures long-term whiteness
3. Technical Implementation Guidelines
Recommended Formulation Protocols:
| Application | Dosage | Processing Method |
|---|---|---|
| Injection Molding | 0.02-0.03% w/w | Dry blend with masterbatch |
| Fiber Spinning | 0.15-0.25% w/w | Melt compounding at 230-260°C |
4. Verified Case Studies
Case 1: Shanghai Yuyu New Materials Co., Ltd.
- Challenge: Yellowing in PVC window profiles
- Solution: 0.04% CBS-127 additive
- Result: ΔE reduction from 5.2 to 1.8 after 2000h QUV
Case 2: Guangdong Polymer Solutions
- Application: ABS electronic housings
- Loading: 0.015% masterbatch
- Outcome: 92% whiteness retention after 5-year field exposure
5. Procurement Consultation
Request technical specifications or samples:
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Global shipment available with COA/MSDS documentation.



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