What is thermogravimetric analysis

Thermogravimetric analysis (TGA) is the mass loss or gain in a sample as a function of temperature and time under controlled atmospheric conditions. More simply, TGA measures the mass lost or gained as a sample is heated according to a predefined program of temperature and time.

Traditionally samples are placed into laboratory ovens and muffle furnaces for fixed times and usually at fixed temperatures. Samples are subsequently weighed manually.

SPS's thermogravimetric units with integrated load cells combine drying, ashing and weighing processes. This drastically improves efficiency, precision and accuracy, and sample throughput.

SPS TGA’s determine data such as such as moisture content, loss or gain of ignition, loss of volatiles, oxidation, pyrolysis, plasticizer loss, and ash content. The TGA’s are suitable for a wide range of materials such as ores, coal, coke, cement, lime, polymers, adhesives, foodstuffs, pharmaceuticals, chemicals, paper, tobacco and organic samples.

Typically the analysis is performed in air, but other gases such as nitrogen or oxygen can be used to achieve a specific test atmosphere. Samples can be heated and cooled to specific heating profiles. The heating rates can be set to each temperature.

Samples can be held at fixed temperatures for a predefined period of time or samples can be constantly weighed at predefined temperatures until they reach constant mass.

Click here for futher information from Wikipedia on thermogravimetric and thermal analysis.

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What is thermogravimetric analysis