Terpentyl peroxybenzoate TAPB 4511-39-1

Pentyl peroxybenzoate

Trade name: Initiator TAPB

English name: Tert-amyl peroxy benzoate  

Chemical name: Terpentyl peroxybenzoate

Structural formula:

Molecular formula: C12H16O3

Molecular weight: 208.30

Theoretical active oxygen content: 7.68%

Properties: This product is light yellow transparent liquid, boiling point 124℃ (760mmHg), decomposition temperature 76-77℃. It can be diluted with the solvent specified by the customer. Insoluble in water, soluble in most of the

Organic solvent, specific gravity (25℃) 1.036-1.045, refractive index (25℃) 1.495-1.500.

CAS: 4511-39-1

UN No. 3103   

Liquid organic peroxides, type C, dangerous goods packing group II.

Main decomposition products: tert-butanol, benzoic acid, methane, acetone, ethane, benzene, etc.

Security indicators:


0.1 hours: 139°C

1 hour: 118°C

10 hours: 99°C

Thermal stability data:

Self-accelerated decomposition temperature (SADT): 60°C

Critical temperature (Tem): -

Control temperature (Tc): -

Storage temperature (Tsmax): -/20 °C

Activation energy E (KJ/mol): 147.2

Technical standards:

Appearance: light yellow transparent liquid

Content: 98% min                       

Effective oxygen: 8.07% min  

TBHP: 1000mg/kg

Inorganic and organic hydrolyzable chlorides 50mg/kg          


1. Excellent medium temperature initiator for high pressure polyethylene (LDPE), mostly used in tube or kettle process, can be combined with initiator PV (tert-butyl peroxypivalate), OT (tert-butyl peroxy-2-ethylhexanoate), OT (tert-butyl peroxy-2-ethylhexanoate), OT (tert-butyl peroxy-2-ethylhexanoate).

(ester), initiator TBPD (tert-butyl peroxyneodecanoate) and diisopropylbenzene peroxide together to form a composite catalyst system, the polymerization effect is better.

2. In the styrene suspension polymerization process, initiator C is used in combination with benzoyl peroxide (BPO) and is the most commonly used initiator for styrene or styrene copolymers.

3. Replacing azo initiators with initiator C in the polymerization process of acrylates reduces the toxicity in the resin. It can also be used in the polymerization reaction of vinyl acetate.

4. It is a high temperature curing agent for unsaturated polyester. The product is widely used in the curing process of unsaturated polyester in FRP, coating, adhesive, etc., such as the molding process of SMC, BMC and DMC.

This product is the preferred curing agent for high temperature curing of unsaturated polyester, and has ideal curing effect for molding and pultrusion molding. If it is combined with BPO, TBPEH, CH and other initiators, it can be used as a compound for molding and pultrusion.

It is more effective with an initiator system.

5. Good vulcanizing agent for most rubbers (except isobutylene rubber).

6. Addition to oils greatly increases their cetane number.

Packaging and Transportation:

The standard packing of our factory is 25 kg polyethylene packing. It can also be supplied according to customer's required packing size, which can be requested by the customer at the time of ordering.

Storage Precautions:

1. Store in a cool, ventilated space at a temperature not exceeding 30°C.

2. Keep away from fire and heat source. It should be stored separately from acids, reducing agents, flammables, combustibles and reducing agents.

3. Lighting, ventilation, etc. in the storage room are of explosion-proof type with switches located outdoors.

4. Care should be taken when handling, to prevent damage to packaging and containers, to prohibit impact and oscillation, and to pay attention to personal protection in dispensing and handling operations.

5. Please read our MSDS carefully when storing, transporting and using this product.

Product expiration date:

In strict accordance with the manufacturer's prompt conditions of storage, transportation. Product quality can be guaranteed within six months.

Fire protection:

1. This product may be violently decomposed due to heat and will violently catch fire, a small amount of product small fire should be quickly extinguished with foam or dry powder fire extinguisher.

2. The fire should be quickly evacuated to a safe distance away and fought with water cannons, and the fire department should be notified.

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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