scope:

This standard prescribes a method for testing thermal battery heat source powder samples for calorific values. It includes the method for calibrating the calorimeter. Since thermal batteries must operate over a wide operating temperature range, the heating value expressed as calories per gram of the material must be closely controlled. The methods contained herein specify suitable conditions obtainable in the laboratory which give results equivalent to actual use. They also assure the required reliability of the equipment, and provide for reproducibility of test results. National Bureau of Standards (NBS) certified standard reference material will be used for this purpose. The following standard samples are available:

SRM-1651 -- Powder with Nominal Value of 350 Calories/gram SRM-1652 -- Powder with Nominal Value of 390 Calories/gram SRM-1653 -- Powder with Nominal Value of 425 Calories/gram.

Other standard samples will be provided as required.