PEG-4000 (Rubber Processing & Release Aid)
CAS Number: 25322-68-3
Polyethylene Glycol 4000 (PEG-4000) is a multifunctional rubber processing aid that improves the dispersibility of fillers, especially carbon black and silica, by coating hydrophilic surfaces and reducing filler agglomeration. In silica-filled compounds, PEG-4000 deactivates acidic silanol groups that would otherwise retard the cure system and absorb DPG. It also acts as an internal mold release agent and extrusion lubricant in various rubber compounds.
Technical Specifications
| appearance | White waxy solid |
| moisture (%) | ≤1.0 |
| pH (5% solution) | 5.5–7.0 |
| melting point (°C) | 53–58 |
| hydroxyl value (mgKOH/g) | 26–31 |
| molecular weight (g/mol) | 3600–4400 |
Applications
- Silica-filled tire tread compounds as cure activator
- Carbon black dispersion aid in NR and SBR
- Internal mold release in injection and compression molded rubber
- Processing aid for extruded rubber profiles
- Latex coagulation and post-treatment aid
Key Features
- Deactivates acidic silanol groups in silica-filled compounds
- Improves carbon black and silica dispersion efficiency
- Functions as internal mold release for cleaner demolding
- Low volatility and good thermal stability during rubber mixing
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CAS Number
25322-68-3
Category
Rubber / Tire ChemicalsAvailability
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