Chemical Name

• Di(2,4-dichlorobenzoyl) peroxide
• Product Form
  50% paste (dispersed in silicone oil)

Structure & Basic Information

• 分子式 Molecular Formula : C₁₄H₆Cl₄O₄
• 分子量 Molecular Weight : 380.0
• CAS 号 CAS No.133-14-2
• EC / EINECS No.205-094-9
• TSCA Status : Listed

Introduction

• DCBP 50% is a white paste diacyl organic peroxide. It is mainly used as a vulcanizing agent for silicone rubber. Upon heating, it decomposes to generate free radicals, enabling crosslinking of silicone rubber in molding, extrusion and other curing processes.

Specifications

• Appearance : White paste
• Assay (%) : 49.0 – 51.0
• Water (%) : ≤ 1.5
• Active Oxygen (%) : 2.1 – 2.2

Properties

• State : Paste
• Paste form improves handling safety and dispersion in silicone rubber formulations

Half-life Data

Half-life data of DCBP in chlorobenzene are as follows:

• 0.1 h Half-life (°C) : 80
• 1 h Half-life (°C) : 65
• 10 h Half-life (°C) : 47
• Activation Energy Ea (kJ/mol) : 122.35

Thermal Stability

• Ts max (°C) : 30
• SADT (°C) : 60
• The product shows good thermal stability under recommended storage conditions

Major Decomposition Products

• Carbon dioxide
• 1,3-Dichlorobenzene
• 2,4-Dichlorobenzene
• Trace bis(2,4-dichlorobenzene)

Application

• Main application
  Silicone rubber vulcanization
• Safe handling temperature : 75 °C
• Recommended curing temperature : 90 °C
• Recommended dosage : 1.1 – 2.3 %

Solubility

• Insoluble in water. Normally used as a paste directly dispersed into silicone rubber formulations.

Safety Data

• Organic Peroxide Type D, Solid : 5.2
• UN No. : 3106

Packaging

• 20 kg
  PE bucket with inner plastic liner

Storage

• Store below 30 °C in a cool and well-ventilated place, away from heat and direct sunlight.

Handling Precautions

• Keep away from heat, sparks and open flames
• Avoid contact with reducing agents, acids, bases and heavy metal compounds
• Do not weigh or repackage in storage areas