ADEKA ADK STAB AO-20 - 1,3,5-Tris(3,5-di-tert-butyl-4-hydroxybenzyl) Isocyanurate Hindered Phenolic Antioxidant for PP & ABS

Full Name: 1,3,5‑Tris(3,5‑di‑tert‑butyl‑4‑hydroxybenzyl) isocyanurate, high‑molecular‑weight hindered‑phenol primary antioxidant It is a high‑performance primary antioxidant for high‑temperature processing of polyolefins and styrenic plastics, representative of low‑volatility grades with good NOx gas‑fading resistance. I. Key Typical Specifications Test Item Typical Value Molecular Weight 784 Melting Point Range 220‑222 ℃ CAS‑No. 27676‑62‑6 Active Ingredient Content ≥99 % Volatile Matter ≤0.1 % Appearance & Form White loose powder Solubility Insoluble in water; soluble in selected organic solvents Standard Packaging 20 kg/bag II. Key Performance Characteristics Low‑volatility high‑temperature‑resistant primary antioxidant High molecular weight and extremely low volatility, suitable for processing temperatures above 270 °C. Not recommended for processing below 200 °C due to its high melting point and poor dispersion under such conditions. Excellent resistance to gas‑fading discoloration Provides outstanding inhibition of yellowing caused by NOx fumes, performing well for white and light‑colored articles. Remarkable synergistic effect when combined with phosphite secondary antioxidants to improve processing thermal stability; thio‑ether secondary antioxidants can be used to enhance long‑term thermal aging performance. Hydrolysis‑resistant, extraction‑resistant and good compatibility Excellent hydrolysis resistance, retaining high antioxidant activity under humid hot‑water conditions. Extraction‑resistant in polyolefins with low risk of blooming. No adverse interaction with mineral‑filled systems. Main functions: Captures free radicals, suppresses thermal degradation of polymers during processing, retards long‑term thermo‑oxidative aging of end‑products, and preserves mechanical properties and color appearance. III. Main Application Fields Polyolefin materials (core applications) • Modified PP, automotive TPO, mineral‑filled polypropylene • PP fibers, flat yarns, films, PPR pipes • PE injection‑molded, rotational‑molded and blow‑molded articles Styrenic polymers and elastomers ABS, HIPS; TPE, TPR thermoplastic elastomers Secondary applications (conditional use) Adhesives, certain synthetic rubbers. Applicable for polyolefin articles complying with food‑contact approvals. Not suitable for formulations with low‑temperature processing or insufficient shear for full melting and dispersion.