Dicumyl Peroxide
Dicumyl peroxide is the rubber vulcanising agent and polyolefin crosslinker of the range, a white crystalline solid above 99% purity with a melting point of 39.5 °C. It is insoluble in water and soluble in ethanol, ether, acetic acid, benzene and petroleum ether, and it is also used as an initiator of styrene polymerisation. Produced at the Dakings Jinshan base.
What You Get With This Grade
- Purity above 99% with actual active oxygen above 5.86% against a theoretical 5.92%
- Ten hour half-life temperature of 117 °C, matched to normal rubber cure windows
- SADT of 75 °C with a 70 °C alarm temperature, the highest storage headroom of our three peroxides
- Cartoned at 4x5 kg per bag so a bag equals a batch weigh-up and the drum never has to be decanted
Technical features
- White crystalline substance, insoluble in water
- Soluble in ethanol, ether, acetic acid, benzene and petroleum ether
- Melting point 39.5 °C, density 1.1 g/cm³ at 20 °C
- Decomposition products are methane, acetophenone and 2-phenylisopropanol
Where Dicumyl Peroxide Is Used
Rubber vulcanisation
Used as the vulcanising agent that crosslinks the rubber network in hoses, seals, belts and moulded goods.
Polyolefin crosslinking
Crosslinks polyolefins in cable and pipe compounds where thermoset behaviour is needed from a thermoplastic base.
Styrene polymerisation
Acts as the initiator of styrene polymerisation where a solid peroxide is preferred to a liquid.
Tire compound curing
Peroxide cure for compounds where sulphur vulcanisation is not suitable.
How Dicumyl Peroxide Looks and Ships
Buyers This Grade Is Built For
- Rubber goods manufacturers running peroxide cure systems
- Cable and pipe compounders crosslinking polyolefins
- Tire plants that also buy TDAE process oil and want both from one supplier
- Plants that prefer a cartoned solid over liquid peroxide handling
What It Stops Going Wrong
- Cure state that varies between batches traces back to inconsistent active oxygen in the peroxide
- Liquid peroxide handling needs pumps, containment and a decanting procedure a solid does not
- Peroxide stored above 30 °C or in sunlight loses activity before it reaches the mixer
- Contact with acids bases or heavy metal compounds degrades the peroxide silently in the store
Quality Index for Dicumyl Peroxide
| CAS number | 80-43-3 |
|---|---|
| Molecular formula | C18H22O2 |
| Molecular weight | 270.4 |
| Appearance | White crystal |
| Purity | > 99% |
| Actual active oxygen | > 5.86% |
| Theoretical active oxygen of pure product | 5.92% |
| Density at 20 °C | 1.1 g/cm³ |
| Melting point | 39.5 °C |
| SADT | 75 °C |
| Alarm temperature | 70 °C |
| Half-life temperature at 10 hours | 117 °C |
How It Ships and How to Store It
Packing
- Packed in carton, net weight 4x5 kg per bag
- Can be packed according to customer requirements
Storage and transport
- Keep away from high temperatures and open flames and avoid direct sunlight
- Avoid contact with reducing agents, acids, bases and heavy metal compounds
- Store in a dedicated cool dry ventilated warehouse below 30 °C
- Handle with care when loading and unloading and keep away from heat sources
How the Lot Is Released
Appearance, purity, active oxygen, density and melting point are checked against the quality index before release, with SDS and COA issued for the lot.
What We Can Change
Can be packed according to customer requirements. Tell us the bag weight your batch weigh-up uses and we will quote against it.
Against the Alternatives
Dicumyl peroxide is a solid crosslinker; the two cumyl hydroperoxide grades are liquid initiators. Its ten hour half-life temperature of 117 °C is well below the 140-145 °C of the hydroperoxides, which is what makes it usable in a rubber cure cycle. Its SADT of 75 °C is the highest of the three, so its storage limit is the 30 °C ceiling rather than a low temperature requirement.
Handling Dicumyl Peroxide on Your Site
Written for the person who receives the drum, not for a brochure.
- Store below 30 °C out of direct sunlight and away from acids bases and heavy metal compounds
- Take the cure temperature reference from the 117 °C ten hour half-life figure
- Open one 5 kg bag per batch rather than part-using a bag, to keep the remaining material sealed
- Keep reducing agents out of the same store
- Plan decomposition response around methane, acetophenone and 2-phenylisopropanol
Dicumyl Peroxide FAQ
What purity is your dicumyl peroxide?
Above 99% purity as a white crystal, with actual active oxygen above 5.86% against a theoretical 5.92%.
What is the melting point?
39.5 °C, with a density of 1.1 g/cm³ at 20 °C.
What is the recommended storage temperature?
Below 30 °C in a dedicated cool dry ventilated warehouse, out of direct sunlight.
What is the half-life temperature?
117 °C at ten hours. The SADT is 75 °C with an alarm temperature of 70 °C.
How is it packed?
In carton at 4x5 kg net per bag, and it can be packed to customer requirements.
Can it be used for anything besides rubber vulcanisation?
Yes — it is also used as an initiator of styrene polymerisation and for polyolefin crosslinking.
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Request a Quotation for Dicumyl Peroxide
Tell us the grade, the tonnage and the packing your site can unload. We reply within 24 hours with the current quality index.