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  Testing Services> Chemical Reactivity Testing> Accelerating Rate Calorimetry (ARC®)




Description

An Accelerating Rate Calorimeter (ARC®) is an instrument that measures a system's adiabatic pressure and temperature response to temperature and time. The ARC can be used to obtain information about the thermal behavior of reactions, reaction onset temperature, heat release rate, pressure rise rate, and amount of condensable vapor and non-condensable gas generated. The ARC is primarily used for liquid-phase reactive systems. It is also used for safety/performance evaluation of explosives and propellants. In isothermal mode, it can be used to evaluate storage conditions.

Building on the calorimetry expertise included in the Differential Scanning Calorimeter, the Accelerated Rate Calorimeter (ARC®) instrument has additional capabilities. These allow performance of experiments requiring low self heat rate detection with simultaneous pressure measurement, isothermal aging and gas/solid phase reaction analysis. The ARC has the unique capability of testing reactive chemicals which result in high pressure generation, as high as 35,000 psia. Data can be used for reactive system process optimization, emergency relief system design, self-accelerated decomposition temperature (SADT) analysis, batch and semi-batch reaction process simulation, and physical property definition.


Instrument

ARC® 254 Accelerating Rate Calorimeter manufactured by Netzsch Group of Selb, Germany


Units

Various. Details provided in Results tab.


Applicable Standard

ASTM E 1981-98 (2004), Standard Guide for Assessing Thermal Stability of Materials by Methods of Accelerating Rate Calorimetry

"This test method covers suggested procedures for the operation of a calorimetric device designed to obtain temperature and pressure data as a function of time for the systems undergoing a physicochemical change under nearly adiabatic conditions. It also outlines the calculation of thermodynamic parameters from the time temperature and pressure data recorded by calorimetric device."



Results

Results Description Unit
Thermal Inertia Thermal inertia of test system N/A
Tonset Onset temperature of exothermic reaction °C
(dT/dt)max Maximum self-heat rate of exothermic reaction °C/min
(dP/dt)max Maximum pressure rise rate of exothermic reaction psi/min
Tmax Temperature at maximum self heat rate °C
Pmax Maximum pressure generated from exothermic reaction psia
ΔT Measured temperature rise °C
ΔTadiabatic Calculated adiabatic temperature rise °C
ΔH Enthalpy of reaction J/g or Cal/g






Sample requirements

Sample quantity of 0.5 g to 10 g is required


Sample preparation

Samples can be run "as-received" or prepared in our laboratory. Contact us to discuss any specific sample preparation needs.



Test Details