Dicumyl Peroxide (DCP, CAS 80-43-3) is the most widely utilized dialkyl organic peroxide crosslinking agent in the polymer industry. Renowned for its superior thermal stability, high crosslinking efficiency, and exceptional heat aging resistance, DCP is the gold standard for crosslinked polyethylene (XLPE) power cables, EVA footwear foams, EPDM automotive seals, and silicone rubbers.
Basic Information
- Chemical Name: Dicumyl Peroxide / Bis(α,α-dimethylbenzyl) peroxide
- CAS Number: 80-43-3
- Molecular Formula: C₁₈H₂₂O₂ (MW: 270.37 g/mol)
- Active Oxygen Content: 5.92% (theoretical)
- 10-Hour Half-Life Temperature: 115°C (1h: 135°C, 0.1h: 157°C)
- SADT: 75°C
Key Product Forms and Commercial Grades
| Physical Form | Active Content / Carrier | Nouryon Grade | Arkema Grade | Target Industry |
|---|---|---|---|---|
| Solid Prills / Crystals | 99% High Purity | Perkadox BC-FF | Luperox DC | XLPE power cables, EVA solar films |
| Powder Blend | 40% on CaCO₃ / Silica | Perkadox BC-40K-PD | Luperox DC40 | EPDM profiles, rubber compounding |
Applications and Recommended Dosages
- XLPE Cable Insulation: Typically 1.5–2.2 phr combined with phenolic antioxidants, crosslinked at 160–180°C in continuous vulcanization lines.
- EVA Footwear Foams: 0.6–1.0 phr with AC blowing agent for high-resilience, tear-resistant midsole formulations.
- EPDM Automotive Profiles: 2.0–4.0 phr delivering robust C-C crosslinks capable of continuous service up to 150°C.
Decomposition By-Products and Low-Odor Alternatives
DCP decomposition yields acetophenone and 2-phenyl-2-propanol, creating a distinct odor. For automotive interior seals and medical applications demanding low VOC and low odor, Bis(tert-butylperoxyisopropyl)benzene (BIBP / Perkadox 14 / Luperox F40, CAS 25155-25-3) is the premier alternative, requiring only 60–70% of the DCP dosage.