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Light Stabilizer 783
Light Stabilizer 783 is a polymeric hindered amine light stabilizer (HALS) blend comprising Light Stabilizers 622 and 944. It appears as a white to pale yellow powder and features low volatility and resistance to water extraction; it is suitable for use in both thin and thick articles.
It inhibits the outdoor photo-degradation of polymers by scavenging free radicals and is commonly used in combination with UV absorbers as well as primary and secondary antioxidants.
It is widely used in products such as PE greenhouse films, geomembranes, PP woven bags, outdoor injection-molded parts, and elastomers.
Composition: 50% Light Stabilizer 622 + 50% Light Stabilizer 944 (1:1 blend); a polymeric Hindered Amine Light Stabilizer (HALS) composite. BASF benchmark grade: Chimassorb 783. Type: High-molecular-weight HALS composite (free-radical scavenger).
⚠️ Note: 783 is not a UV absorber; HALS do not absorb UV radiation but instead scavenge free radicals generated during photo-aging.
二、Physicochemical Properties
Appearance: White to pale yellow powder/granules
Melting range: 55–140°C
Ash content: ≤0.1%
Volatile content: ≤0.5%
Solubility: Soluble in organic solvents; insoluble in water
Characteristics: High molecular weight, low volatility, resistant to water extraction, low migration, and resistant to blooming/exudation.
三、Mechanism of Action
四、 Key Advantages
✅ Suitable for both thin and thick products (films, flat yarns, and thick molded parts).
✅ High molecular weight; resistant to extraction and low migration.
✅ Provides effective long-term thermal stability.
✅ A cost-effective outdoor weather-resistance solution for polyolefins.
❌ Contraindications: Do not use with sulfur-containing or acidic flame retardants (e.g., certain APP types), as this can cause deactivation.
五、 Applicable Materials
PE (LDPE, LLDPE): Greenhouse films, geomembranes, waterproofing membranes, woven bag flat yarns.
PP: Injection-molded parts, outdoor PP fibers, shade nets.
EVA, TPE elastomers, PU (polyurethane).
PA (nylon), POM, ABS, and outdoor parts made of certain engineering plastics.
六、 Recommended Dosage
PP thick products and injection-molded parts: 0.05–0.5%.
Fibers and flat yarns: 0.2–0.6%.
七、 Packaging, Storage, and Transport
