​​Bis(tert-butylperoxyisopropyl)benzene​​ (CAS 25155-25-3), also known as ​​BIPB​​ or ​​"Odorless DCP"​​, is a premium organic peroxide widely used as a crosslinking agent in polymer industries. Its molecular formula is ​​C₂₀H₃₄O₄​​ (MW: 338.48 g/mol) with a ​​theoretical active oxygen content of 9.45%​​

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​Key Properties​​

​​Physical State​​: White crystalline powder or flakes

​​Melting Point​​: 44–48°C; ​​Density​​: 1.63 g/cm³

​​Solubility​​: Insoluble in water; soluble in ethanol, benzene, and CCl₄

​​Decomposition​​: Half-life of 1 hour at 134°C, generating non-odorous byproducts (e.g., tert-butanol, acetone)

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​Applications​​

​​Rubber & Elastomer Curing​​:

Superior alternative to DCP (Dicumyl Peroxide) for ​​EPDM​​, ​​silicone rubber​​, and ​​NBR​​, requiring only ​​2/3 the dosage​​ for equivalent crosslinking efficiency

Eliminates unpleasant odors (common with DCP) in finished products like seals, cables, and foamed EVA

​​Polymer Modification​​:

Controls molecular weight distribution in ​​polypropylene (PP) degradation​​ for high melt-flow index resins

Initiator for ​​styrene polymerization​​, yielding higher molecular weight PS

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​Safety & Handling​​

​​UN 3106, Class 5.2 Organic Peroxide​​ (Packing Group II)

​​SADT (Self-Accelerating Decomposition Temperature)​​: 80°C; store below 30°C away from combustibles

​​GHS Hazards​​: H242 (Heating may cause fire), H319 (Causes eye irritation)