Optical Brightener FP-127: Properties, Specifications, and Industrial Applications

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

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.