Thermal Analysis: Thermogravimetric analysis


Thermogravimetric analysis or thermal gravimetric analysis (TGA) is a method in which the mass of a sample is measured over time as the temperature changes. This measurement provides information about physical phenomena such as mass changes, temperature stability., oxidation/reduction behaviuor, decomposition, corrosion studies, compositional analysis and thermokinetics

A typical thermogravimetric analyzer consists of a precision balance with a sample pan located inside a furnace with temperature. The temperature is generally increased at a constant rate. The thermal reaction may occur under various atmospheres e.g. air, vacuum, inert gas, oxidizing/reducing gases, corrosive gases etc. Pressure may also be varied, e.g. high vacuum, high pressure, constant pressure, or controlled pressure.

TGA is a useful technique for studying polymeric materials, including thermoplastics, thermosets, elastomers, composites, plastic films, fibers, coatings, paints, and fuels.


Temperature range             -150°C to 2400°

Heating rate                        0.001 to 50 K/min  

Sensors                              TGA, TGA-DTA, TGA-DSC, TGA-DSCcp

Vacuum-tight                     10-4 mbar

Atmospheres                     Inert, oxidizing, static, dynamic, vacuum

Temperature resolution     0.001 K

Balance resolution             0.1 μg (over the entire weighing range)

Maximum sample load     35000 mg (incl. crucible), DSC: 0.19 ml, DTA: 0.9 ml

DSC enthalpy accuracy    ± 2% (for most materials)  

In house: TGA/DSC - MS Netzsch STA 449 FS QMS 403 C