Thermal Analysis
 • Thermal Gravimetric  Analysis (TGA) -
  Measure change in weight during heating or cooling
 • Differential Thermal Analysis (DTA)-
 They are use for thermal investigation where thermal 
 change can be observed and characterised.
 • Differential Scanning Calorimetry (DSC)-
  Measure heat absorbed or liberated during heating or 
 cooling
 • Thermomechanical  Analysis (TMA)-
  Measure change in dimensions during heating or 
 cooling
       THERMOGAVIMETRIC ANALYSIS
            (TGA)
      GENERAL PRINCIPLES INVOLVED IN
         THERMOGRAVIMETRY
  • PRINCIPLE : Thermogravimetry is a
  technique in which a change in the weight of a
  substance is recorded as a function of temperature or 
  time.
  • Instrument: Instrument used for thermogravimetry is 
  “Thermobalance”.
   Data recorded in form of curve known as ‘Thermogram’.
   Thermogravimetric Analysis (TGA)
   • A technique that permits the continuous weighing 
   of a sample as a function of temperature and/or as 
   a function of time at a desired temperature
      The Various componants of thermobalance
      1) Sample Holder: The shape,size and material of the sample 
          holder have an important effect on the shape of the TG curve.
      2)Recording Balance: It is the most important componant of a 
          thermobalance. It must  fulfill the following requirements.
      •   Its accuracy , reproducibility, sensitivity and capacity should 
          be similar to those of an analytical balance.
      •   It should have rapid response to weight changes.
      •   Simple to operate and versatile.