In the field of polymer stabilization, Chimassorb 944 (CAS 71878-19-8) stands out as one of the most effective hindered amine light stabilizers (HALS). Also known as UV 944 or UV Absorber 944, this additive provides exceptional protection against ultraviolet radiation and oxidative degradation in plastics, coatings, and fibers.
As industries demand materials that can withstand long-term outdoor exposure, the performance of Chimassorb 944 continues to make it a preferred choice among formulators and manufacturers.
I. What Is Chimassorb 944?
Chimassorb 944, with CAS number 71878-19-8, is a high molecular weight HALS stabilizer designed to protect polymers from photo-oxidative degradation. Unlike UV absorbers that absorb ultraviolet light directly, HALS work by neutralizing free radicals formed during photo-degradation, providing long-term and regenerative protection.
It is a polymeric stabilizer that offers:
- Excellent compatibility with polyolefins and engineering plastics
- Low volatility, even during high-temperature processing
- Non-discoloring and non-migrating characteristics
- Synergistic effects when combined with UV absorbers
II. Chemical and Physical Properties
| Property | Description |
| CAS Number | 71878-19-8 / 70624-18-9 |
| Appearance | White to slightly yellow powder or granules |
| Molecular Type | Polymeric HALS |
| Solubility | Insoluble in water; soluble in organic solvents |
| Volatility | Very low (suitable for high-temperature applications) |
These properties make Chimassorb 944 ideal for use in outdoor polymer systems where long-term color retention and surface protection are essential.
III. How HALS Stabilizers Work
HALS stabilizers like Chimassorb 944 function through a cyclic mechanism that deactivates free radicals generated during UV exposure. This regenerative property allows HALS to maintain effectiveness for prolonged periods, unlike traditional UV absorbers that gradually lose activity.
In formulations, UV Absorber 944 can be used alone or combined with other light stabilizers to enhance UV resistance and thermal stability. This dual approach significantly extends the service life of plastics exposed to sunlight.
IV. Applications of Chimassorb 944
Chimassorb 944 (CAS 71878-19-8) is widely used in various industries where polymers require long-term stability under UV exposure. Common applications include:
1. Polyolefins (PP, PE)
In polypropylene and polyethylene films, fibers, and molded parts, Light Stabilizer 944 prevents cracking, chalking, and loss of mechanical properties. It ensures excellent color stability and gloss retention, making it ideal for outdoor applications such as garden furniture, automotive parts, and agricultural films.
2. Automotive Plastics
Automotive bumpers, dashboards, and trim parts exposed to sunlight require reliable UV protection. UV 944 helps maintain surface appearance and structural integrity over years of service.
3. Engineering Plastics
In nylon, polyacetal, and polycarbonate systems, Chimassorb 944 provides synergistic stabilization when used with UV absorbers, offering resistance against discoloration and brittleness caused by UV and heat.
4. Fibers and Textiles
Synthetic fibers, such as PP or PET yarns, use Chimassorb 944 to ensure long-term resistance to UV degradation during outdoor exposure in geotextiles, ropes, and carpet backing.
5. Coatings and Films
When used in coatings, UV Absorber 944 offers protection for both the coating layer and the underlying substrate, preventing yellowing and surface cracking.
V. Comparison: Chimassorb 944 vs Other HALS Stabilizers
Compared to lower molecular weight HALS products, Chimassorb 944 offers superior permanence and extraction resistance. Its polymeric structure ensures:
- Reduced migration from the polymer matrix
- Better heat stability during processing
- Longer-lasting performance under harsh outdoor conditions
For example, while Chimassorb 119 provides fast initial protection, Chimassorb 944 ensures sustained stability and color retention, particularly in polyolefin-based systems.
VI. Advantages of Using Chimassorb 944
- Long-term UV and heat stabilization
- Excellent compatibility with various polymers
- Non-volatile and non-extractable
- Works synergistically with antioxidants and UV absorbers
- Improves product durability and weather resistance
These benefits make Chimassorb 944 one of the most trusted HALS stabilizers in polymer modification and outdoor applications.
VII. Supply Chimassorb 944: Reliable Manufacturer Support
As a professional manufacturer and supplier of polymer additives, we specialize in providing high-quality Chimassorb 944 (CAS 71878-19-8) to global customers. Our production facilities operate under strict quality management systems, ensuring batch-to-batch consistency and reliable performance.
We supply Chimassorb 944 with high purity and excellent thermal stability, suitable for use in various polymer applications such as polyolefins, coatings, and engineering plastics.
Our technical team can provide:
- Tailored additive solutions for your formulation needs
- Full documentation including COA, TDS, and MSDS
- Competitive factory prices and stable global delivery
- Expert guidance on UV stabilizer selection and application
Whether you are a compounder, plastic processor, or masterbatch producer, we are committed to helping you achieve long-term UV stability and product durability with our UV Absorber 944 series.
VIII. Conclusion
With its outstanding performance and proven reliability, Chimassorb 944 (CAS 71878-19-8) remains one of the most trusted HALS stabilizers in the polymer industry. Compared to other UV stabilizers, its polymeric structure provides long-lasting protection against photo-oxidation and heat degradation.
As a leading manufacturer of Chimassorb 944, we ensure consistent product quality and technical support for your production needs. Partnering with us means accessing not only top-grade UV 944 materials but also a team dedicated to helping you enhance your product’s weather resistance and lifespan.
