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Antioxidant 168
Antioxidant 168 is a phosphite-based secondary antioxidant appearing as a white powder; it features high-temperature resistance and low volatility. It is primarily used during the high-temperature granulation and extrusion processing of polymer materials to decompose hydroperoxides, stabilize the melt, and inhibit processing-induced yellowing.
It is frequently used in combination with hindered phenolic primary antioxidants—such as Antioxidant 1010 or 1098—and finds wide application in polyolefins, engineering plastics, and elastomers.
Detail
Antioxidant 168 (Irgafos 168)
一、 Basic Information
Chemical Name: Tris(2,4-di-tert-butylphenyl) phosphite | CAS No.: 31570-04-4 | Product Type: Phosphite-type / Secondary (auxiliary) antioxidant; hydroperoxide decomposer. Generally not used alone; typically compounded with hindered phenol primary antioxidants for synergistic effects.
二、Physicochemical Properties
Appearance: White free-flowing powder/granules
Melting Point: 183–187°C
Molecular Weight: 646.9
Volatiles: ≤0.3%
Ash Content: ≤0.1%
Light Transmittance: ≥98% at 425nm; ≥98% at 500nm
Solubility: Soluble in toluene, chloroform, and cyclohexane; insoluble in water
三、Mechanism of Action & Key Features
✅ Focuses on protection during high-temperature processing: Decomposes hydroperoxides generated during extrusion and pelletizing; inhibits melt degradation; stabilizes melt flow index (MFI); prevents molecular weight loss, chain scission, and cross-linking.
✅ Highly effective against yellowing; preserves plastic color during processing.
✅ Low volatility; excellent high-temperature stability and hydrolysis resistance.
✅ No long-term aging protection (protects only during processing); must be used in combination with primary antioxidants such as 1010 or 1098.
✅ Synergistic Blends: 1010+168 = B215 (1:2 ratio), B225 (1:1 ratio); 1098+168 = B1171 (for Nylon formulations).
四、 Applicable Materials
PP, PE, EVA, POE, ABS, HIPS, PS, PA (Nylon), PET, PBT, PC, TPE/TPR elastomers, hot-melt adhesives, cable compounds, and the vast majority of other polymer materials.
五、 Recommended Dosage
As a standalone secondary antioxidant: 0.05–0.2%. Total dosage when compounded with primary antioxidants: 0.1–0.25%.
六、 Packaging, Storage, and Transport
25kg Packaging: Store in a cool, dry, and sealed environment; protect from moisture to prevent hydrolysis. Not classified as a hazardous chemical.
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