- ▸ Used as a high-temperature organic peroxide crosslinking agent for peroxide-cured elastomers such as EPDM, EPM, silicone, HNBR, and fluoroelastomers in molded and extruded rubber goods.
- ▸ Crosslinks polyethylene (PE) and EVA for wire-and-cable insulation, jacketing, and rotomolded parts, raising heat resistance and mechanical performance.
- ▸ Acts as a coupling/grafting and modification agent in controlled rheology and reactive-extrusion processes for polyolefins.
- ▸ Serves as a foaming/curing co-agent system component in cross-linked polyolefin foams used in automotive, footwear, and insulation.
- ▸ Functions as a radical initiator for thermoset and adhesive cure where a high decomposition temperature and low volatility are required.
A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.
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Di(tert-butylperoxyisopropyl)benzene (BIPB) is a solid/flake dialkyl peroxide crosslinker for rubber and polyolefins — a high-temperature peroxide with good scorch safety, often preferred where a non-volatile, easy-to-handle solid is wanted. Identity: CAS 25155-25-3.
What it is
BIPB (CAS 25155-25-3, C20H34O4) is a difunctional dialkyl peroxide supplied as flakes/granules or on a carrier. Its low volatility and solid form make it convenient and low-odor in compounding.
Industrial uses
It is used to crosslink (cure) EPDM, EVA, polyethylene and elastomers and as a polymerization initiator and coupling/grafting agent. The solid form and high decomposition temperature give good scorch safety and clean processing in wire-and-cable, rubber goods and crosslinked-polyolefin compounds.
Forms, grades and handling
BIPB is supplied as flakes/granules or on an inert carrier (e.g. 40% on filler) in bags and drums. It is an organic peroxide — observe storage-temperature limits and handling precautions per the SDS. Properties are typical reference values; the Certificate of Analysis (CoA) for the lot you buy governs. Always consult the current Safety Data Sheet (SDS) before handling, and confirm regulatory status and suitability for your application and jurisdiction. Each lot ships with CoA, TDS and SDS.
Bulk supply and RFQ
RawSource sources Di direct from producers in bulk, with CoA, TDS and SDS per lot. Tell us the grade, particle size or specification and quantity you need, and we will quote it. Products are sold for industrial and professional use.
Typical Properties
Typical reference values, not a specification; the Certificate of Analysis (CoA) for the lot governs.
| Property | Typical Value |
|---|---|
| Chemical / class | Dialkyl peroxide (crosslinker) |
| CAS Number | 25155-25-3 |
| Molecular Formula | C20H34O4 |
| Molecular Weight | 338.5 g/mol |
| Handling | Refer to the current SDS |
Regulatory & registration requirements
- TSCA (US):
- REACH (EU):
- EC number: 246-678-3
Source: EPA TSCA Inventory (July 2025 release) · ECHA CHEM — retrieved 2026-07-12
Frequently Asked Questions
What is BIPB peroxide used for?
Di(tert-butylperoxyisopropyl)benzene (BIPB, CAS 25155-25-3) is a solid dialkyl peroxide used to crosslink EPDM, EVA, polyethylene and elastomers and as a polymerization initiator/grafting agent, valued for low volatility and scorch safety in wire-and-cable and rubber. RawSource supplies it for industrial use.
How is bulk BIPB peroxide supplied and quoted?
RawSource supplies BIPB peroxide in bulk with CoA, TDS and SDS per lot. Pricing is quote-based on grade, particle size/specification and volume; submit an RFQ with your application and quantity.
What is the REACH and TSCA regulatory status of Di(tert-Butylperoxyisopropyl)benzene?
Di(tert-Butylperoxyisopropyl)benzene (CAS 25155-25-3) is subject to U.S. TSCA Inventory requirements; supplying it into the EU requires valid REACH registration ((EC) No 1907/2006). RawSource cannot verify a third-party supplier's registrations — buyers should require documented TSCA and REACH compliance for their jurisdiction and volume (EC 246-678-3).