Di-Tertiary Butyl Peroxide (DTBP) is a well-known and very well characterised organic peroxide. It is widely available in pure form. DTBP has always been used as the ‘standard’ sample for showing the performance of the Accelerating Rate Calorimeter - and more recently other calorimeter manufacturers have used DTBP as their standard sample.

Early work with DTBP in the Accelerating Rate Calorimeter was with a relatively small sample in a sample container of heavy mass. More recently there has been an aim to reduce the thermal inertia (φ, heat lost to the container). In light-weight (or high volume) containers using a pure sample only a small sample mass can be used if rupture of the container was to be avoided. Therefore most recent work with DTBP has been with a solution in toluene. Data from a series of DTBP/toluene tests with different concentrations of DTBP is given in THT Technical Information Sheet No 23.

Here it was shown that uniquely in the Accelerating Rate Calorimeter it is possible to work with concentration from 10- 100% DTBP. However from approximately 30% DTBP with bombs of low mass, it is necessary to reduce sample size to prevent spontaneous reaction that can cause container rupture. This is not the case with other equipment. For example, vent sizing instruments may really only be used in the range 10-20% DTBP.

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Reference:
ARC Technical Information Sheet No. 100, Thermal Hazard Technology, UK