Hindered Amine Light Stabilizer UV-622

HALS UV Stabilizer UV-622 – High Molecular Weight Hindered Amine Light Stabilizer for Polymers

Basic Information

• Product Name: Light Stabilizer 622 (HALS UV-622)

• Chemical Name: Poly(4-hydroxy-2,2,6,6-tetramethyl-1-piperidineethanol-alt-1,4-butanedioic acid)

• CAS Number: 65447-77-0

• Appearance: White to off-white powder or granules

• Molecular Weight: High (polymeric)

• Volatility: Low

• Alkaline Content: Low

Overview
UV‑622 is a polymeric hindered amine light stabilizer (HALS) designed to protect polymers against degradation caused by ultraviolet (UV) radiation and weathering. Its high molecular weight and low basicity provide excellent resistance to migration and extraction, making it suitable for demanding applications where long‑term outdoor exposure is required. It exhibits synergistic effects when combined with antioxidants and UV absorbers.

Key Performance Features

• High molecular weight – reduces volatility and migration, ensuring long‑lasting protection.

• Low basicity – minimizes interaction with acidic components and catalysts.

• Excellent thermal stability – withstands high processing temperatures.

• Migration resistance – remains in the polymer matrix for extended service life.

• Synergistic action – works effectively with primary and secondary antioxidants and UV absorbers to maximize weatherability.

Applications

• Polyethylene (PE): Injection molding, rotational molding, films, tapes, and fibers.

• Ethylene‑vinyl acetate (EVA): Films and molded articles.

• Polypropylene (PP): Outdoor applications requiring long‑term stability.

• Polyurethanes (PU): Flexible and rigid foams, coatings, and elastomers.

• Polyacetals (POM) and polyamides (PA): Engineering plastics.

• Elastomers and adhesives: For improved weatherability.

• Other polymers: Suitable for a wide range of thermoplastics and thermosets.

Recommended Usage
Typical dosage ranges from 0.1% to 1.0% by weight of the polymer, depending on the application and required service life. For optimal performance, combine with antioxidants (e.g., phenolic or phosphite types) and UV absorbers (e.g., benzotriazoles or benzophenones).

Packaging and Storage

• Packaging: 25 kg per cardboard box with inner plastic bag, or custom packaging upon request.

• Storage: Store in a dry, well‑ventilated place. Keep containers tightly sealed to prevent moisture absorption and contamination.

Safety

• Use appropriate personal protective equipment (gloves, safety goggles, dust mask) when handling.

• Avoid excessive dust exposure; wash hands thoroughly after handling.

• For detailed safety information, refer to the Safety Data Sheet (SDS).

Quality Assurance
Each batch is tested for molecular weight, particle size, and thermal stability to ensure consistent performance.