TBPP-25C75 is an initiator (25% active ingredient in isododecane) for (co)polymerization of ethylene. Used for both tubular and autoclave processes. In most cases a combination with other peroxides is used to ensure a broad reactivity range.

Specifications

Acid as 2-ethylhexanoic acid	≤ 0.30 %
Active oxygen	≥ 7.18 %
Appearance	Clear liquid
Assay	≥ 97.0 %
Color	≤ 30 APHA
Inorganic + organic hydrolysable chloride	≤ 100 mg/kg
TBHP	≤ 1000 mg/kg

Characteristics

Density, 20 °C	0.900 g/cm³
Viscosity, 20 °C	4.3 mPa.s

Applications

TBPO-21S (tert-Butyl peroxy-2-ethylhexanoate) can be used for the market segments: polymer production, thermoset composites and acrylics with their different applications/functions. For more information please check our website and/or contact us.

Half-life data

The reactivity of an organic peroxide is usually given by its half-life (t1/2) at various temperatures. For TBPO-21S in chlorobenzene half-life at other temperatures can be calculated by using the equations and constants mentioned below:

0.1 hr	at 113°C
1 hr	at 91°C
10hr	at 72°C
Formula 1	kd = A·e-Ea/RT
Formula 2	t½ = (ln2)/kd
Ea	124.90 kJ/mole
A	1.54E+14 s-1
R	8.3142 J/mole·K
T	(273.15+°C) K

Thermalstability

Organic peroxides are thermally unstable substances, which may undergo self-accelerating decomposition. The lowest temperature at which self-accelerating decomposition of a substance in the original packaging may occur is the Self- Accelerating Decomposition Temperature (SADT). The SADT is determined on the basis of the Heat Accumulation Storage Test.

SADT	35°C
Emergency temperature (Tₑ )	25°C
Control temperature (Tc)	20°C
Method	The Heat Accumulation Storage Test is a recognized test method for the determination of the SADT of organic peroxides (see Recommendations on the Transport of Dangerous Goods, Manual of Tests and Criteria – United Nations, New York and Geneva).

Storage

Due to the relatively unstable nature of organic peroxides a loss of quality can be detected over a period of time. To minimize the loss of quality, Thousands chemicals recommends a maximum storage temperature (Ts max.) for each organic peroxide product.

Ts Max.	10°C
Ts Min.	-30°C to prevent crystallization
Note	When stored according to these recommended storage conditions, Trigonox® 21S will remain within the THOUSANDS CHEMICALS specifications for a period of at least 3 months after delivery.

Packaging and transport

In North America TBPO-21S is packed in non-returnable, vented, five gallon polyethylene containers of 35 lb net weight. In other regions the standard packaging is a 30-liter HDPE can (Nourytainer®), vented, for 25 kg peroxide content. Both packaging and transport meet the international regulations. For the availability of other packed quantities consult your THOUSANDS CHEMICALS representative. TBPO-21S is classified as Organic peroxide type C; liquid, temperature controlled, Division 5. 2; UN 3113; PG II.

Safety and handling

Keep containers tightly closed. Store and handle TBPO-21S in a dry well-ventilated place away from sources of heat or ignition and direct sunlight. Never weigh out in the storage room. Avoid contact with reducing agents (e. g. amines), acids, alkalis and heavy metal compounds (e. g. accelerators, driers and metal soaps). Please refer to the Safety Data Sheet (SDS) for further information on the safe storage, use and handling of TBPO-21S. This information should be thoroughly reviewed prior to acceptance of this product. The SDS is available at THOUSANDS CHEMICALS.com/sds-search.

Major decomposition products

Carbon dioxide,tert-Butanol,Heptane,3-tert-Butoxyheptane