Chiguard^®: UV Stabilizers

Ultraviolet (UV) radiation from sunlight gradually degrades polymers, causing yellowing, embrittlement, and performance loss. Chiguard^® UV stabilizers effectively prevent UV-induced damage and significantly extend product lifespan in outdoor environments.

Why Do We Need UV Stabilizers?

• Prevent yellowing and discoloration
• Reduce embrittlement and loss of strength
• Maintain long-term appearance and performance

They act as an invisible shield, protecting against sunlight, oxygen, and heat.

Two Types: UV Absorbers (UVA) & Hindered Amine Light Stabilizers (HALS)

UVA + HALS Synergy

• UVA: Absorb UV radiation and release it as harmless heat, reducing the number of high-energy photons reaching the polymer. They do not capture free radicals or “repair” existing damage. Critical for transparent parts, films, and clear coatings.
• HALS: Capture and neutralize free radicals (such as R•, ROO•), using a regenerative cycle to suppress the propagation step of autoxidation. They do not absorb UV themselves. Especially effective for thick, colored, or opaque materials. Acidic components may deactivate HALS, requiring acid-resistant grades or co-additives.

Synergistic Effect: Combining UVA and HALS reduces both surface photodamage and internal oxidative degradation. This significantly lowers yellowing, chalking, cracking, and embrittlement—helping retain gloss and mechanical properties, and extending outdoor service life.

Together, they form a double shield against environmental stress.

Key Applications

• Plastics: Outdoor furniture, parts, accessories
• Coatings: Automotive and industrial surfaces
• Adhesives & Sealants
• Textiles: Awnings, outdoor fabrics, apparel

Impact on Product Lifespan

• Enhances weatherability and durability
• Slows down degradation
• Maintains long-term performance and appearance
• Meets market demand for high-weatherability products

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