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Thermogravimetric analysis (TGA) is used to characterize sample volatility, as well as thermal stability and response.
- Exquisitely precise weight sensitivity – can detect sample mass changes < 0.1 ug
- Only a few milligrams of material is needed due to high instrument sensitivity
- Rapid and straightforward data collection
- Minimal sample prep
- Not available for measurements with temperatures below ~ 25 °C
TGA and derivative TGA curves of sodium tungstate sample analyzed at 10 °C/min from ambient temperature to 800 °C.
TGA Curves used in failure analysis of polyamide nylon (PA) enclosures on terminal block plug, which thermally degraded and caused critical instrument failure. Plot shows two different volatilization temperatures (peaks): suspected to be the casing itself and unknown filler.
TA Instruments SDT Q600
- Mass Sensitivity: 0.1 ug
- Temperature Range: ambient to 1500 °C
- Calorimetric Accuracy: ± 2% (based on metal standards)
- Controlled Heating Rate (up to 1000 °C): 0.01 to 100 °C / min
- Controlled Heating Rate (up to 1500 °C): 0.01 to 25 °C / min
- Solids, powders, and semisolids accepted
- Maximum Sample Mass: ~ 0.5 g
- Pan Options:
- Platinum (40 μL or 110 μL volume options)
- Ceramic Cup (40 μL or 90 μL volume options)
- Flat-faced sample or powders are preferred: measurement quality depends on contact uniformity between sample and pan
When a sample reaches high enough temperatures, it undergoes chemical and physical transitions that affect its sediment mass.
A TGA system measures the minute changes in sample weight in a controlled thermal environment – usually, as heat is applied to the system. Alternatively, constant temperature experiments can be conducted to evaluate a material’s thermal stability over a set time period.
TGA instruments plot weight as a function of temperature and/or time, and analyzing these plots reveals several thermal properties of the material, including (but not limited to): thermal stability, heat resistance, volatility, and vaporization temperatures.
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