Doverphos S-480 Phosphite for PVC Stabilization from Canada
Doverphos S-480 is distearyl pentaerythritol diphosphite providing hydrolysis resistance in rigid PVC pipe compounds. Classifies under HTS 3812.39.9000 as plastics compound stabilizer. Essential for long-term outdoor weatherability.
Duty Rate — Canada → United States
15%
Rate breakdown
9903.05.2910%Section 301 (forced labor) — additional 10% ad valorem on products of Canada
Import Tips
• Certify phosphorous acid content per ASTM test methods
• Include PVC formulator trial data supporting stabilizer function
• Hydrophobic packaging required for moisture-sensitive phosphites