• Home
• Product Categories
• Antioxidants
• Phosphite Antioxidants

Phosphite Antioxidants

Phosphite Antioxidants (TNPP, Irgafos® 168, PEP-8, Tris(2,4-di-tert-butylphenyl) phosphite)

 Secondary hydroperoxide decomposers for long-term heat and process stability*

Phosphite antioxidants act as peroxide scavengers, rapidly decomposing hydroperoxides into non-radical species and halting the propagation phase of autoxidation. When paired with primary phenolics, they deliver synergistic, cost-effective protection during high-shear extrusion, injection molding, and extended service life.

Our range features non-hydrolyzable, low-volatility phosphites (Irgafos® 168, 126, P-EPQ), high-purity tris(nonylphenyl) phosphite (TNPP) replacements, acid scavengers, and liquid process aids. Supplied in free-flowing powders, dust-free granules, pumpable liquids, and pre-dispersed masterbatches (10–50 % active).

**Key Benefits**  
- **Hydrolysis Resistance**: >99 % active retention after 48 h @ 60 °C/95 % RH  
- **Synergy Boost**: 2–4× LTTS extension with 1:1 or 1:2 phenolic blends  
- **Clarity & Color**: Non-yellowing grades for crystal PS, PC, and PET bottle  
- **Melt Flow Control**: Prevents viscosity drop in rPP and rPE recycle streams  

**Typical Applications**  
- Polyolefins (HDPE, LLDPE, PP homo/co-polymer)  
- Engineering thermoplastics (ABS, HIPS, POM)  
- PVC heat stabilizers (with epoxidized soybean oil)  
- Synthetic lubricants & metalworking fluids  
- Adhesives & hot-melt systems  

All grades include TDS, SDS, and COA.