Bis(3,3,5-trimethylhexanoyl) peroxide K 3851-87-4

Bis(3,3,5-trimethylhexanoyl) peroxide

Trade name: Initiator K

English name: Bis(3,5,5-trimethylhexanoyl) peroxide

Chemical name: Bis(3,3,5-trimethylhexanoyl) peroxide

Structural formula:

Molecular formula: C18H34O4

Molecular weight: 314.5

Theoretical active oxygen content: 5.09%

CAS: 3851-87-4

Main decomposition products: CO2, 2,2,4,7,9,9-hexamethyldecane, 2,4,4-trimethylpentane .

Security indicators:

Half-life (measured in chlorobenzene solution):

0.1 hours: 96°C

1 hour: 77°C

10 hours: 59°C

Thermal stability data:

Self-accelerated decomposition temperature (SADT): 20°C

Critical Temperature (Tem): 10°C

Control temperature (Tc): 0°C

Storage temperature (Tsmax): -10/0 °C

Technical standards:

Appearance: Clear liquid

Purity: 74-76%       

Color: 20 Pt-Co max   

Inorganic and organic hydrolyzable chlorine: 250mg/kg max      


The standard package is a polyethylene plastic drum with a net weight of 20 kilograms. Small packages can also be packaged according to the user's required specifications.

K is a liquid organic peroxide of Class D, Goods Classification: 5.2, UN No. 3115, transported under temperature control, packaged in Dangerous Goods Group II.... Rail and air transportation are prohibited.

Safety Precautions:

(1) Keep away from fire, open flames and heat sources.

(2) Avoid exposure to reducing agents (e.g., amines), acids, alkalis, and heavy metal compounds (e.g., accelerants, metal soaps, etc.)

(3) Refer to the Safety Data Sheet (MSDS) for this product.


1. Initiators for ethylene polymerization

K is one of the most commonly used initiators for LDPE tubular or kettle polymerization, and is often used in conjunction with other initiators in order to obtain a wider range of polymerization temperatures, from 150-80°C to 1,000°C.


2. Vinyl chloride polymerization initiator

K is also an initiator for the aqueous phase suspension method of vinyl chloride polymerization, with an initiation temperature of 50-70 °C. 

Storage conditions:

Keep the package closed and in a well-ventilated state, the maximum storage temperature of 0 ℃, to avoid and reducing agents such as amines, acids, alkalis, heavy metal compounds (accelerators and metal soaps), is strictly prohibited in the warehouse

Room dispensing and pickup.

Storage stability:

Stored in accordance with the conditions prompted by the manufacturer, the product can be guaranteed to meet factory technical standards within three months.

Fire Fighting:

Small fires need to be extinguished with dry powder or carbon dioxide extinguishers and sprayed with large amounts of water to prevent re-ignition. Large fires need to be sprayed with large quantities of water from a safe distance away.

We offer products for sale in China (in compliance withRegulations on the Administration of Internet Sales of Hazardous Chemicals) and some of the products of the global export services, can provide including hazardous chemicals packaging, "outbound cargo packaging performance inspection certificate", "commodity inspection list" and other related export procedures.
We have experience in exporting hazardous chemicals, including Class 5.2 Dangerous Goods with Cold Chain Transportation Products, Class 3 Dangerous Goods and Class 9 Dangerous Goods, etc., and have exported to the United States of America, Russia, Turkey, India, Ukraine and other countries.

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