Figure 1:
Available climates for the determination of the thermal stability of substances.

Example 1
DTG, reaction rate d/dt:
Influence of the temperature profile changes (Kuala Lumpur - Malaysia, Los Angeles - USA and Vancouver - Canada) on the reaction rate of an inorganic pigment decomposition.

Example 2
TG, reaction progress :
Comparison between TG, MS-H₂O (Gas 1) and MS-CO₂ (Gas 2) (expressed as reaction progress, normalized signals) of an inorganic pigment as a function of time for the Los Angeles temperature profile.

Example 3
DSC, reaction progress:
Influence of the temperature profile changes (Las Vegas - USA, New York - USA and Quebec - Canada) on the reaction extent of low-temperature decomposed substances.

Comments:

The important goal of the investigation of the kinetics of the thermal decomposition of solids is the need to determine the thermal stability of substances, i.e. the temperature range over which a substance does not decompose with an appreciable rate. The correct prediction of the reaction progress of materials which are unstable under ambient conditions (food, drugs, some polymers, etc.) requires accurate application in the calculations of both:
- the kinetic parameters
- the exact temperature profile for a given climate

Calculations can be achieved for any fluctuation of the temperature which makes possible the predictions of thermal stability properties for varying climates. Exact consideration in the calculations of daily minimal and maximal temperature variations of worldwide climates provides very valuable insight when interpreting and quantifying the reaction progress of materials subjected to atmospheric conditions.