- ▸ Free-radical crosslinking initiator for peroxide-cured EPDM, EPM, silicone, and other saturated elastomers where sulfur cure is unsuitable, producing heat- and compression-set-resistant networks.
- ▸ High-temperature crosslinking agent for polyethylene (PE) and ethylene-vinyl-acetate (EVA), including wire-and-cable insulation, foams, and rotomolded parts, owing to its relatively high decomposition temperature and long half-life.
- ▸ Controlled visbreaking/degradation (rheology modification) of polypropylene to produce controlled-rheology (CR-PP) resins with narrowed molecular-weight distribution for fiber and thin-wall molding grades.
- ▸ Initiator and curing catalyst for unsaturated polyester and vinyl-ester thermoset resins in pultrusion, SMC/BMC, and high-temperature composite molding.
- ▸ Grafting agent for functionalizing polyolefins (e.g., maleic-anhydride grafting) to make coupling agents and compatibilizers for filled and blended compounds.
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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2,5-Dimethyl-2,5-di(tert-butylperoxy)hexane (DBPH) is a high-temperature dialkyl peroxide used to crosslink polymers and elastomers and to initiate polymerization and grafting — valued for its high decomposition temperature and clean, low-odor byproducts. Identity: CAS 78-63-7.
What it is
DBPH (CAS 78-63-7, C16H34O4) is a liquid difunctional dialkyl peroxide with a high decomposition temperature. It generates radicals on heating and is one of the standard high-temperature crosslinking peroxides.
Industrial uses
It is used to crosslink (cure) polyethylene, EPDM, EVA and silicone rubber, to initiate high-temperature polymerization, to graft monomers onto polyolefins, and for controlled rheology (visbreaking) of polypropylene. Its high decomposition temperature suits high-temperature processing with good scorch safety.
Forms, grades and handling
DBPH is supplied as a liquid (and on inert carriers) in temperature-controlled packaging. It is an organic peroxide — temperature-controlled storage and careful handling are essential; consult the SDS and observe storage-temperature limits. 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 2,5-Dimethyl-2,5-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/initiator) |
| CAS Number | 78-63-7 |
| Molecular Formula | C16H34O4 |
| Molecular Weight | 290.44 g/mol |
| Handling | Refer to the current SDS |
Regulatory & registration requirements
- TSCA (US):
- REACH (EU):
- EC number: 201-128-1
Source: EPA TSCA Inventory (July 2025 release) · ECHA CHEM — retrieved 2026-07-12
Frequently Asked Questions
What is DBPH peroxide used for?
2,5-Dimethyl-2,5-di(tert-butylperoxy)hexane (DBPH, CAS 78-63-7) is a high-temperature dialkyl peroxide used to crosslink polyethylene, EPDM, EVA and silicone rubber, initiate polymerization, graft monomers, and for controlled-rheology PP. RawSource supplies it for industrial use; it is an organic peroxide requiring temperature-controlled handling.
How is bulk DBPH peroxide supplied and quoted?
RawSource supplies DBPH 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 2,5-Dimethyl-2,5-Di(tert-butylperoxy)hexane?
2,5-Dimethyl-2,5-Di(tert-butylperoxy)hexane (CAS 78-63-7) 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 201-128-1).