In the competitive world of plastics manufacturing, visual appeal is paramount. The initial brilliance and whiteness of plastic products can significantly influence consumer perception and product value. However, many polymers are susceptible to yellowing and discoloration over time, a result of thermal degradation during processing or photodegradation from UV light exposure. To combat this, manufacturers rely on advanced additives. Among these, Fluorescent Brightener 378 (C.I. 378) stands out as a premier solution, offering unparalleled whitening and brightening effects for a vast array of plastic applications.

At NINGBO INNO PHARMCHEM CO.,LTD., we specialize in providing high-purity chemical ingredients that elevate the quality of our clients' final products. Fluorescent Brightener 378, also known as Optical Brightening Agent (OBA) 378, is a cornerstone of our portfolio for the plastics industry, designed to deliver exceptional, long-lasting whiteness.

What is Fluorescent Brightener 378?
Fluorescent Brightener 378, identified by its CAS No. 40470-68-6, is a high-performance optical brightener. Chemically, its molecular formula is C₃₀H₂₆O₂, and it presents as a light-yellow crystalline powder. The magic of this compound lies in its unique mechanism of action. It functions by absorbing invisible ultraviolet (UV) light (in the 360-380 nm range) and re-emitting it as visible blue-violet light (in the 430-440 nm range). This emitted blue light effectively masks the inherent yellow cast of polymers, resulting in a product that appears whiter, brighter, and cleaner to the human eye. This process is not a chemical bleach but an optical effect, meaning it enhances appearance without degrading the polymer structure.

Key Properties and Specifications
Our Fluorescent Brightener 378 is produced under stringent quality control to ensure superior performance and consistency.
Appearance: Light-Yellow Crystalline Powder
Purity (Content): ≥ 99%
Melting Point: 225-230°C
Molecular Weight: 418.53
Colored Light: Blue-Greenish Light

Its high melting point and excellent thermal stability make it perfectly suited for high-temperature processing common in the plastics industry. Furthermore, its superb weather resistance and low volatility ensure that the whitening effect is durable and does not fade or migrate out of the plastic over time, even in demanding outdoor applications.

Versatile Applications Across the Plastics Industry
The versatility of Fluorescent Brightener 378 makes it an invaluable additive for a wide range of thermoplastics. Its efficacy has been proven in numerous applications, delivering significant improvements in product aesthetics.

1. Polyvinyl Chloride (PVC):
PVC, in both its rigid and flexible forms, benefits immensely from the addition of OBA 378. It is highly effective in products such as window profiles, pipes, siding, sheets, and transparent films. The recommended dosage is minimal, making it a cost-effective choice.
- For whitening opaque or colored PVC: 0.01-0.05% (10-50g per 100kg of material).
- For enhancing the transparency of clear PVC: 0.0001-0.001% (0.1-1g per 100kg of material).

2. Polystyrene (PS) and its Copolymers:
In materials like General Purpose Polystyrene (GPPS) and High Impact Polystyrene (HIPS), Fluorescent Brightener 378 neutralizes yellowness, providing a brilliant white finish essential for packaging, disposable cutlery, and appliance components.
- Recommended dosage for whitening: 0.001% (1g per 100kg of material).

3. Acrylonitrile Butadiene Styrene (ABS):
ABS is widely used for its toughness and rigidity in automotive parts, electronic housings, and consumer goods. However, it can yellow upon exposure to heat and light. OBA 378 counteracts this, maintaining a pristine white appearance throughout the product's lifecycle.
- Recommended dosage: 0.01-0.05% (10-50g per 100kg of material).

4. Other Thermoplastics:
The benefits of Fluorescent Brightener 378 extend to other polymers as well. It demonstrates excellent whitening effects in polymethyl methacrylate (PMMA), polyester (e.g., PET slices), polypropylene (PP), and synthetic leathers, enhancing their visual appeal and marketability.

The Advantages of Choosing Our Fluorescent Brightener 378
When you partner with NINGBO INNO PHARMCHEM CO.,LTD., you are choosing a product defined by quality and performance.
- Superior Whitening Power: Achieves a brilliant, neutral white with an attractive blue-greenish tint at very low concentrations.
- Exceptional Durability: Offers excellent lightfastness and weather resistance, ensuring the whitening effect lasts.
- High Thermal Stability: Withstands high processing temperatures without decomposition, ensuring it is suitable for a wide range of manufacturing processes.
- Cost-Effectiveness: A small addition provides a significant whitening effect, offering great value.
- High Purity and Consistency: Our manufacturing process guarantees a product with over 99% purity, ensuring reliable and repeatable results in every batch.

As a leading manufacturer and dedicated supplier of specialty chemical raw materials, NINGBO INNO PHARMCHEM CO.,LTD. is committed to empowering plastic producers with the highest quality additives. We understand the critical role that materials like Fluorescent Brightener 378 play in product success. If you are looking to enhance your plastic products with a brilliant, durable whiteness, we are your trusted partner. For more information on the price, to request a sample, or to buy our high-performance Fluorescent Brightener 378, please contact our expert team. We are ready to help you purchase the ideal solution to meet your specific manufacturing needs and elevate your products above the competition.