Bis (tert-butyldioxyisopropyl) Benzene, BIPB, 25155-25-3

Bis (tert-butyldioxyisopropyl) Benzene, BIPB, 25155-25-3

🔹 Chemical Identity

• Name: Bis(1-(tert-butylperoxy)-1-methylethyl)-benzene

• Synonyms: Luperox F, Luperox F90P, Luperox F40KEP, Bis(t-butylperoxy isopropyl)benzene, Di(tert-butylperoxy isopropyl)benzene (BIPB)

• CAS No: 25155-25-3

• EINECS: 246-678-3

• Molecular Formula: C20H34O4

• Molar Mass: 338.48 g/mol

🔹 Physico-Chemical Properties

• Appearance: White crystalline powder or liquid formulations depending on concentration

• Density: 1.63 g/mL at 25 °C

• Melting Point: 44–48 °C

• Boiling Point: ~434 °C (estimated)

• Flash Point: >230 °F

• Refractive Index: ~1.6000

• Vapor Pressure: Negligible at 20 °C

• LogP: 7.3 (hydrophobic character)

• Active Oxygen Content: ~9.45%

• Activation Energy: 36.1 kcal/mol

• Half-life: ~10 hours at 120 °C

🔹 Safety & Regulatory

• Hazard Class: 5.2 (Organic Peroxide)

• UN ID: UN 3106

• Packing Group: II

• WGK Germany: 1 (low hazard to water)

• Risk Codes:

  • R7, R8 – Fire risk with combustible materials

  • R20 – Harmful by inhalation

  • R36/37 – Irritating to eyes and respiratory system

  • R53 – May cause long-term adverse effects in aquatic environment

• Safety Codes:

  • S17 – Keep away from combustible material

  • S36/37/39 – Wear protective clothing, gloves, eye/face protection

  • S26 – In case of eye contact, rinse immediately with water and seek medical advice

🔹 Industrial Applications

• Crosslinking Agent:

  • Chlorinated polyethylene (CPE)

  • Ethylene-propylene-diene monomer (EPDM)

  • Ethylene-vinyl acetate copolymer (EVA foam)

  • Silicone rubber

  • Nitrile rubber (HNBR)

  • Fluororubber (TP-2)

  • Chlorosulfonated polyethylene (CSM)

• Advantages:

  • Same crosslinking effect at ~2/3 dosage compared to dicumyl peroxide (DCP)

  • Odorless during processing and in finished products

  • Especially suitable for flexible cord insulation, EVA foam toys, and silicone rubber molding vulcanization

🔹 Preparation (Industrial Synthesis)

• Reaction of tert-butyl hydrogen peroxide with diisopropyl alcohol in the presence of strong oxidizing catalysts and sulfuric acid.

• Purification via sodium carbonate/sodium sulfate treatment, followed by washing with NaOH and hot water.

• Final refined product purity: >92%.

🔹 Packaging & Storage

• Packaging: 20 kg cartons

• Storage: Cool, dry, well-ventilated area, away from direct sunlight and incompatible materials

• Handling:Strictly under controlled industrial conditions by trained personnel

🔹 Synonyms & Trade Names

• Luperox F

• Luperox F90P

• Luperox F40KEP

• Bis(t-butylperoxy isopropyl)benzene

• Di(tert-butylperoxy isopropyl)benzene (BIPB)

• 1,3-bis[3-(tert-butylperoxy)propyl]benzene

• 1,2-bis(2-(tert-butylperoxy)propan-2-yl)benzene

• 1,4-bis[2-(tert-butylperoxy)propan-2-yl]benzene

• Alpha,alpha-Bis-(tert-butylperoxy)-1,3-diisopropylbenzene

• (Phenylenebis(1-methylethylidene))bis(1,1-dimethylethyl)-peroxid

• Bis(tert-butyldioxyisopropyl)benzene

🔹 Registry & Identifiers

• CAS Number: 25155-25-3

• EINECS Number: 246-678-3

• UN ID: UN 3106 (Organic Peroxide, Type D, Solid)

• Hazard Class: 5.2 (Organic Peroxide)

• Packing Group: II

• RTECS Number: SD8431900

• TSCA: Listed

🔹 Sectoral Suitability

🔹 Dosage Guidelines

• General Rule: For the same crosslinking effect, BIPB requires about 2/3 of the dosage compared to dicumyl peroxide (DCP).

• Typical Dosage Ranges:

  • Rubber compounds: 2–3 phr (parts per hundred rubber)

  • EVA foams: 1.5–2 phr

  • Cable insulation: ~2 phr

• Concentration Variants:

  • 96% BIPB (pure form): High reactivity, faster vulcanization, requires careful handling.

  • 40% BIPB (diluted form): Safer, easier dosage control, suitable for sensitive applications.

🔹 Key Advantages

• High efficiency at lower dosage → cost savings and reduced by-products.

• Odorless during processing and in finished products.

• Wide compatibility with polymers (Silicone, EVA, EPDM, CPE, HNBR, TP-2, etc.).

• Significant improvement in thermal stability and mechanical strength.