Chimassorb 944 High MW HALS UV Stabilizer for Polyolefins

Product Overview of Chimassorb 944 (Light Stabilizer 944)

Premium Polymeric HALS for Polyolefins

At Gotrays, we provide high-performance Light Stabilizer 944, a direct chemical equivalent to the industry-standard Chimassorb 944. This additive is a high molecular weight Polymeric HALS (Hindered Amine Light Stabilizer) designed to impart exceptional light stability to a wide range of polymers. Identified by CAS 71878-19-8, our product is essential for manufacturers seeking to protect plastics from the damaging effects of ultraviolet radiation and long-term thermal exposure. We position this stabilizer as a versatile solution for polyolefins, ensuring that end-products maintain their mechanical properties and aesthetic quality over extended periods.

Radical Scavenging Mechanism and Advantages

The effectiveness of our HALS 944 stems from its advanced radical scavenging capability. When polymers are exposed to UV light, free radicals form, leading to chain scission and degradation. Chimassorb 944 functions by trapping these free radicals, effectively interrupting the degradation cycle and preventing surface cracking or chalking.

Our commitment to quality ensures that our customers receive a product optimized for industrial performance:

• High Purity Standards: We maintain strict specifications, including low ash content (≤ 0.1%) and high transmittance rates, ensuring the additive does not negatively impact the color or clarity of the final product.
• Global Supply Reliability: We leverage robust logistics to supply Light Stabilizer 944 globally, ensuring consistent availability for large-scale production runs.
• Processing Stability: Due to its high molecular weight, this stabilizer exhibits excellent resistance to extraction and low volatility, making it superior to lower molecular weight alternatives during high-temperature processing.

Key Features and Performance Benefits

When we supply Light Stabilizer 944, we focus on delivering a solution that solves actual processing headaches. As a high molecular weight HALS, this product is engineered to stay exactly where you put it. Its primary advantage is low volatility, meaning it won’t burn off or vanish when your manufacturing temperatures spike. This ensures the material retains its protective properties right from the production line.

Durability and Migration Control

For applications exposed to the elements, extraction resistance is non-negotiable. Because of its oligomeric structure, our Chimassorb 944 equivalent resists being washed out by water or fluids. This makes it ideal for outdoor applications like agricultural films or artificial grass. Furthermore, it exhibits low migration, preventing the common issue of surface blooming that can ruin the aesthetic and functional quality of plastic parts.

Synergistic Performance

We rarely use this stabilizer in isolation. It acts as a powerful antioxidant synergist. When you combine it with other UV absorbers or hindered phenols, the protection level multiplies. This synergy significantly extends the service life of polyolefins like PP and PE, even under harsh environmental stress.

Performance Highlights:

• High Thermal Stability: Minimal weight loss during high-heat processing.
• Extraction Resistant: Stays locked in the polymer matrix, even in humid conditions.
• Versatile Compatibility: Excellent dispersion in LDPE, HDPE, and Polypropylene.
• Food Contact Safe: Suitable for applications requiring indirect food contact compliance.

Technical Data Sheet: Chimassorb 944 Specifications

When we supply Light Stabilizer 944 (the chemical equivalent to Chimassorb 944), we prioritize consistency and performance. This Polymeric HALS is defined by its high molecular weight structure, which directly translates to superior thermal stability and low volatility during your production process.

Below is the standard physical property data for our CAS 71878-19-8 product. We ensure these metrics meet strict industrial standards for use in polyolefins like PP and PE.

Physical Properties and Chemical Composition

Property	Specification
Product Name	Light Stabilizer 944
Chemical Class	High Molecular Weight HALS
CAS Number	71878-19-8
Appearance	White powder or yellowish granules
Melting Range	100 – 135 °C
Molecular Weight (Mn)	2100 – 3000 g/mol
Ash Content	≤ 0.1%
Volatile Content	≤ 0.5%

Optical and Thermal Stability Metrics

To ensure the material does not affect the color or clarity of your final product, we maintain high transmittance rates. The high molecular weight also provides excellent extraction resistance, making it durable even in harsh environments.

• Transmittance (425 nm): ≥ 93%
• Transmittance (450 nm): ≥ 95%
• Solubility: Exhibits excellent compatibility with Polypropylene, Polyethylene, and other polyolefins, while remaining resistant to water extraction.

Primary Applications in the Plastics Industry

We supply Light Stabilizer 944 as a versatile solution designed to meet the rigorous demands of the global plastics market. As a high-performance Chimassorb 944 equivalent, this Polymeric HALS is engineered to provide superior protection across a wide variety of polymer types, ensuring your products withstand harsh environmental conditions.

Our customers rely on this stabilizer for several key application areas:

• Thin Section Polyolefins: It delivers exceptional Polypropylene UV protection for fibers, tapes, and ribbons. Its high molecular weight prevents migration, making it ideal for applications where surface quality is critical.
• Agricultural and Packaging Films: We highly recommend this product as an LDPE Agricultural Film Stabilizer. It offers excellent durability for greenhouse films and packaging materials made from LLDPE and LDPE, resisting degradation from prolonged sun exposure.
• Thick Section Molding: For injection molded parts like outdoor furniture, crates, and artificial grass, HALS 944 ensures long-term thermal and light stability in HDPE and PP matrices.
• Elastomers and Copolymers: Beyond standard polyolefins, it shows great compatibility with EVA, EPDM, and TPE, providing robust protection for specialized industrial components.

Recommended Dosage and Usage Guidelines

Determining the correct concentration of Chimassorb 944 (Light Stabilizer 944) is critical for balancing cost and performance. Since the optimal dosage varies significantly based on the polymer type and the final thickness of the product, we recommend a tailored approach rather than a one-size-fits-all formula.

General Concentration Factors

The amount of HALS 944 required generally correlates with the surface area and exposure levels of the application:

• Thin Sections: Applications like agricultural films, tapes, and fibers often require specific adjustment to handle high surface exposure to UV radiation.
• Thick Sections: For injection molded parts or outdoor furniture, the stabilization requirements focus on preventing surface cracking and chalking over time.

Optimization and Synergy

To get the most out of this polymeric HALS, consider the following when setting up your production trials:

• Run Trials: We always advise conducting a series of concentration trials to determine the minimum effective dosage for your specific climate and lifespan goals.
• Synergistic Blending: Light Stabilizer 944 performs exceptionally well when combined with other UV absorbers and antioxidants. This synergy can often allow for optimized dosage levels while enhancing overall thermal and light stability.

Regulatory Compliance and Safety Standards

When dealing with high-performance polymers, ensuring regulatory compliance is just as critical as the technical specs. Our Light Stabilizer 944 (the chemical equivalent to Chimassorb 944) is designed to meet rigorous industry standards, making it a reliable choice for global manufacturers.

Food Contact and Global Regulations

One of the biggest advantages of this Food Contact HALS is its suitability for sensitive applications.

• Food Packaging: It is approved for use in polyolefins intended for indirect food contact, provided specific migration limits are met.
• Global Reach: As a Plastic Additives Supplier, we ensure our material aligns with major chemical inventories, supporting your exports to markets with strict standards like the EU and North America.

Safety and Handling Profile

We prioritize safety in the supply chain. CAS 71878-19-8 is known for a favorable toxicity profile, but standard industrial hygiene is a must.

• Handling: The product comes as a white powder or granule; standard PPE should be worn to prevent dust inhalation or skin contact.
• Stability: It remains stable under normal storage and processing conditions, posing no significant hazard when handled correctly.

Packaging, Storage, and Logistics for Chimassorb 944

As a dedicated plastic additives supplier, we ensure that our Light Stabilizer 944 reaches you in perfect condition, ready for immediate industrial use. We understand that global logistics requires robust packaging to maintain the integrity of high-performance chemicals during transit.

Commercial Packaging Options:

• Standard Cartons: 25kg cartons lined with a polyethylene (PE) bag to prevent moisture ingress.
• Fiber Drums: 25kg fiber drums with inner PE liners, offering superior protection for long-distance shipping.

Storage and Shelf Life
To preserve the effectiveness of this polymeric HALS (CAS 71878-19-8), store the material in a cool, dry, and well-ventilated area away from direct sunlight. The product is hygroscopic, so keeping the container tightly sealed is crucial. When stored under these optimal conditions, the material maintains a stable shelf life, ensuring consistent performance in your polyolefin applications.

Handling and Safety
We recommend following standard industrial hygiene protocols when handling Chimassorb 944. Operators should wear appropriate personal protective equipment to avoid dust formation and direct contact with skin or eyes. Proper handling ensures safety while maintaining the high purity required for sensitive applications like food contact materials.

Frequently Asked Questions about Chimassorb 944

When we supply Light Stabilizer 944, customers often ask how it fits into their specific formulation compared to other additives. Here is a breakdown of the most common technical inquiries regarding this High Molecular Weight HALS.

Differences Between Chimassorb 944 and Other HALS

The main distinction of Chimassorb 944 (Light Stabilizer 944) lies in its molecular structure. It is an oligomeric hindered amine with a molecular weight ranging from 2100–3000 g/mol.

• Volatility: Its high molecular weight ensures low volatility, meaning it does not evaporate easily during high-temperature processing.
• Migration: Unlike lower molecular weight stabilizers, HALS 944 has high resistance to migration, preventing surface blooming.
• Stability: It offers superior long-term thermal stability, making it a robust choice for durable goods.

Suitability for Agricultural Films

Yes, HALS 944 is widely used in agricultural films. Its chemical stability ensures it remains effective even in harsh outdoor environments.

• Extraction Resistance: It resists extraction by water, which is critical for films exposed to rain and irrigation.
• Application: We recommend it for greenhouse films and mulching films where long-service life is required.
• Performance: It effectively protects LDPE and LLDPE structures from UV degradation.

Compatibility and Synergy with Antioxidants

Chimassorb 944 is rarely used alone in high-demand applications. It shows excellent synergistic performance when combined with other additives.

Combination Type	Benefit
With UV Absorbers	Enhances overall light stability and surface protection.
With Antioxidants	Improves thermal oxidative stability during processing and end-use.
Polymer Compatibility	Highly compatible with PP, PE, EVA, and TPE.

For the best results in your polyolefin formulations, we suggest running trial blends to determine the optimal ratio of this UV degradation inhibitor alongside your standard antioxidant package.