In demanding applications such as automotive under-the-hood seals, medical grade tubings, silicone keypads, and premium athletic footwear, the pungent odor generated by traditional DCP crosslinking agents causes severe product degradation. Bis(tert-butylperoxyisopropyl)benzene (BIBP, CAS 25155-25-3 / 2212-81-9, Trade Names: Perkadox 14, Luperox F40) is the universally acclaimed odorless organic peroxide crosslinking agent for high-performance elastomers.
Basic Information & CAS Isomers
- Chemical Name: Bis(tert-butylperoxyisopropyl)benzene
- CAS Number Explanation:
25155-25-3: Meta/Para isomer mixture (Standard commercial grade)2212-81-9: 1,4-Bis(tert-butylperoxyisopropyl)benzene (Pure para isomer)
- Molecular Formula: C₂₀H₃₄O₄ (MW: 338.48 g/mol)
- Active Oxygen Content: 9.45% (Pure substance) — nearly 60% higher than DCP (5.92%)
- Half-Life Temperatures: 10h: 121°C | 1h: 142°C | 0.1h: 165°C
Comprehensive Comparison: BIBP vs. DCP
| Parameter | BIBP (Perkadox 14 / Luperox F40) | DCP (Dicumyl Peroxide) |
|---|---|---|
| Odor & Environmental Impact | Ultra-low odor, no blooming / exudation | Pungent acetophenone odor, prone to blooming |
| Active Oxygen | 9.45% (high crosslink density) | 5.92% |
| Equivalent Dosage | Only 60%–70% of DCP dosage required | 100% baseline |
| Processing Scorch Safety | Higher half-life temperature yields superior scorch margin | Lower activation threshold increases scorch risk |
| Compression Set Resistance | Exceptional resistance to compression set at elevated temperatures | Standard performance |
Recommended Applications & Formulations
- EPDM Weatherstrips & Coolant Hoses: 2.0–3.5 phr of BIBP-40B paired with 1.0 phr of TAIC co-agent.
- HNBR (Hydrogenated Nitrile) Seals: 4.0–6.0 phr of BIBP-40, rated for continuous exposure up to 165°C in aggressive lubricants.
- EVA / POE Foams: Delivers superior energy return and odorless comfort in premium footwear midsoles.