Differential thermal analysis hazards

ASSESSMENT OF REACTIVE CHEMICAL HAZARDS COMPUTATION OF REACTIVE CHEMICAL HAZARDS DIFFERENTIAL SCANNING CALORIMETRY DIFFERENTIAL THERMAL ANALYSIS MAXIMUM REACTION HEAT REACTION SAFETY CALORIMETRY... 

Differential thermal analysis (DTA) Chemical testing technique that produces similar data to DSC. DTA uses temperature differences to generate test results DSC has largely replaced the DTA technique as a screening tool for obtaining chemical hazard test data... 

Potential hazards (flammability, corrosivity, etc.) are reviewed to identify concerns regarding the storage and handling of reactive chemicals, and information is obtained from raw material suppliers (e.g., technical bulletins). Flashpoint, DSC, or differential thermal analysis (DTA) testing is typically done by the customer. 

ASSESSMENT OE REACTIVE CHEMICAL HAZARDS CHEMICAL STABILITY/REACTIVITY ASSESSMENT DIFFERENTIAL SCANNING CALORIMETRY (DSC) DIFFERENTIAL THERMAL ANALYSIS (DTA)... 

Any compd or mixt whose heat of formation is smaller by 500 J/g (or more) than the sum of the heats of formation of its reaction products must be regarded with suspicion and handled with more than usual care. The hazards involved in working with a potentially expl system are directly proportional to the amount and to the rate of energy release. Because the reaction kinetics cannot be predicted, the propensity of a new system for expl reaction must be determined. The sensitivity of the system can be evaluated by means of impact, friction, shock and electrostatic discharge. Appropriate methods are reviewed in the Experimental and Hazard Assessment section of this article. Sensitivity to heat or elevated temp may be evaluated by use of differential thermal analysis (DTA)... 

Gygax, R. (1980) Differential scanning calorimetry- Scope and limitations of its use as tool for estimating the reaction dynamics of potential hazardous chemical reactions, in 6th International Conference on Thermal Analysis and Calorimetry, Birkhauser Verlag, Basel. 

Liquid oxygen analyses are customarily made for process control, product purity and to avoid hazards. Usually analytical information required for process control is not extensive. Use of modified Or sat apparatus for manual determination of the oxygen contents of various liquid samples is routine in most plants. Relatively simple thermal conductivity analyzer-controllers govern the flow of liquid air fractions under distillation where differential pressure control is not applicable. Pressure drop and inspection of liquid in a small glass flask are usually sufficient for mechanical filter cycle regulation but a continuous carbon dioxide analysis may be helpful as a check on the overall function. A method which is sufficiently precise for this use is discussed later. 

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