Optical brightener FP-127 (C.I. Fluorescent Brightener 378) is a high-efficiency fluorescent whitening agent widely used in plastics and polymer processing. Known for its brilliant blue-white fluorescence, excellent thermal stability, and strong compatibility with PVC, PS, and other engineering plastics, FP-127 provides superior whitening and brightening effects compared to many traditional brighteners.
This article presents a detailed technical overview of FP-127, including its chemical identity, physical properties, application fields, and handling guidelines for industrial users.
1. Chemical Identity of Optical Brightener FP-127
- Product Name: Optical Brightener FP-127
- Chemical Name: 4,4′-Bis[(E)-2-(2-methoxyphenyl)vinyl]biphenyl
- C.I.: Fluorescent Brightener 378
- CAS Number: 40470-68-6
- Molecular Formula: C₃₀H₂₆O₂
- Molecular Weight: 418.53 g/mol
FP-127 belongs to the biphenyl-styrene class of optical brighteners and is valued for its high fluorescence efficiency and excellent stability during high-temperature polymer processing.
2. Specifications and Physical Properties
| Parameter | Specification |
|---|---|
| Appearance | Light yellow powder |
| Purity | ≥99% |
| Melting Point | 219–221 °C |
| Particle Size | 300 mesh minimum |
| E-value | 1700 ± 50 |
| Ash Content | ≤0.5% |
| Volatile Content | ≤0.5% |
| Maximum Absorption | 375 nm (ethanol) |
| Maximum Emission | 436 nm |
Solubility
- Poorly soluble: Water
- Soluble in: Alkanes, mineral oils, and most common organic solvents
These solubility characteristics make FP-127 well-suited for incorporation into a wide range of hydrophobic resin systems.
3. Application of Optical Brightener FP-127
Optical brightener FP-127 is especially effective in thermoplastic formulations due to its high thermal resistance and ability to impart a clean, blue-white tone.
Key Application Areas
- PVC (Polyvinyl Chloride) rigid and flexible formulations
- PS (Polystyrene) and styrene-based copolymers
- General-purpose thermoplastics for injection molding, extrusion, film, and sheet applications
- Modified plastics and engineering polymer blends
- Masterbatch production for uniform whitening distribution
FP-127 enhances:
- Whiteness and brightness
- Perceived cleanliness of the finished product
- Optical clarity in transparent or translucent materials
- Resistance to yellowing during processing
Due to high E-value and excellent light-emitting properties, FP-127 is often selected for applications requiring high-grade visual appearance.
4. Packaging Information
Optical brightener FP-127 is supplied in:
- 25 kg fiber drums,
- With double-layer inner plastic bags to prevent contamination and moisture exposure.
5. Transportation Guidelines
To maintain product quality during transport:
- Avoid inversion or dropping
- Protect from direct sunlight
- Keep away from moisture and rain
- Prevent collision or package damage
Proper handling ensures that FP-127 retains its fluorescence intensity and purity upon arrival.
6. Storage Conditions
For optimal stability, FP-127 should be stored:
- In a cool, dry, and well-ventilated environment
- Away from heat sources, oxidants, and humidity
- With a recommended storage period not exceeding 2 years
Conclusion
Optical brightener FP-127 is an essential high-performance whitening agent for PVC, PS, and a broad range of plastic applications. Its outstanding fluorescence intensity, high thermal stability, and excellent compatibility make it one of the most reliable and widely used brighteners for achieving premium-grade whiteness and brightness in polymer products.
Shandong Grand Chemical Co., Ltd. is a professional manufacturer and exporter of optical brighteners in China. If you have any inquiries, please feel free to contact us.