TGA – Thermogravimetric Analysis

Consulting | Implementation | Evaluation | Reports

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Natalie Schmidt, M.Sc. | Process Safety Engineer

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Thermogravimetric analysis (TGA) is used to characterize temperature-dependent physical and chemical material properties in a precisely controlled atmosphere. ARCIn TGA, the mass of a sample is measured while it is heated or cooled in a specified atmosphere. It is mainly used to characterize materials with regard to their composition. With a TGA/DSC instrument it is even possible to measure thermal events that do not lead to a change in mass, such as melting processes, glass transitions or other solid-solid transitions.

Thermogravimetric analysis (TGA) is often used in combination with DSC, TMA and DMA. The system can be connected online to a mass spectrometer or FTIR spectrometer to determine the type of gas products produced. In combination with a moisture generator, it can also be used to investigate sorption processes.

Measurement principle:

The sample (1 – 10 mg) is subjected to a constant heating rate and the mass and mass change over temperature is recorded.

Measured quantities

  Mass change over time and temperature
  Pressure and temperature curve during reaction

Standard parameters

  Temperature range from ambient to 1000 °C
  Measurement under air of nitrogen flow


  Coupling with mass spectrometry
  Measurements at different heating rates to investigate decomposition kinetics


Images courtesy of TA Instruments, Eschborn, Germany

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