1. Basic Product Information
Chemical Name Tris(2,4‑di‑tert‑butylphenyl) phosphite
Synonyms Antioxidant 168, AO‑168, Irgafos 168, Phosphorous acid tris(2,4‑di‑tert‑butylphenyl) ester
CAS Number 31570‑04‑4
EC Number 250‑709‑6
Molecular Formula C₄₂H₆₃O₃P
Molecular Weight 646.92 g/molHS‑Code 29209000
2. Chem‑Physical Properties
Appearance White crystalline powder
Odor Almost odorlessMelting point 181‑187 °C
Decomposition temperature >350 °C
Vapor pressure (20℃) Extremely low (1.3×10⁻¹⁰ hPa)
Solubility in water Practically insoluble
Solubility Soluble in toluene, xylene, chloroform; insoluble in water
Hydrolysis sensitivity Moisture‑sensitive, avoid long‑term exposure to humid air
Bulk density ~0.40‑0.55 g/cm³
3. Quality Specification (Industrial Grade)
| Test Item | Unit | Specification | Typical Result | Test Method |
|---|---|---|---|---|
| Appearance | — | White crystalline powder | Complies | Visual |
| Assay (HPLC) | % | ≥99.0 | 99.4 | HPLC |
| Melting range | °C | 181‑187 | 183‑185 | Capillary |
| Light transmittance 425 nm | % | ≥97.0 | 98.2 | Spectrophotometer |
| Light transmittance 500 nm | % | ≥98.0 | 99.0 | Spectrophotometer |
| Volatile matter | % | ≤0.50 | 0.18 | Oven method |
| Ash content | % | ≤0.10 | 0.04 | Gravimetric |
| Moisture | % | ≤0.10 | 0.05 | Karl‑Fischer |
4. Application & Use
- Secondary phosphite processing antioxidant, decomposes hydroperoxides during polymer high‑temperature processing, suppresses yellowing, maintains melt flow rate。
- Widely used for PP, PE, ABS, PC, PET, PBT, PA, PS, TPU, PMMA, elastomers (SBR, EPDM, SEBS)。
- Excellent synergistic effect when blended with phenolic primary antioxidants e.g. Antioxidant 1010 / 1076; typical blend formula B215, B225。
- Approved for food‑contact plastic articles under relevant food‑contact regulations.- Recommended dosage: 0.05‑0.3 % by weight of polymer.
5. Packing
Standard packing: 25 kg paper‑plastic composite bag / carton box with inner PE bag
Alternative: 25 kg fibre drum with PE liner
6. Storage & Transportation
Storage
Store in cool, dry, well‑ventilated warehouse, temperature 10‑30 °C. Keep containers tightly closed.
Moisture‑sensitive, strictly protect from humidity and rain; avoid direct sunlight and heat sources.
Shelf‑life: 24 months under recommended storage conditions.Keep away from strong oxidizing agents. Prevent dust‑air explosive mixture.
Transportation
Non‑dangerous goods for international transport
Proper Shipping Name: Tris(2,4‑di‑tert‑butylphenyl) phosphite
Avoid heavy moisture, high temperature and package breakage during transit.
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