CHEM runs a variation of the Naval Surface Weapons Laboratory's Propellant Evaluation Program (PEP) in the background to calculate critical propellant properties such as density, specific impulse, characteristic velocity (C-star), combustion temperature for most solid, hybrid and liquid propellant combinations. You can try various chemical formulas on your computer and optimize it for your application. The output parameters are used in FPRED, which permits you to design your own solid rocket motor.
CHEM is very simple to use. Simply select the chemicals you want in your propellant and the amount of each chemical. Then select a desired combustion chamber pressure and the exit cone pressure (usually sea level pressure) and hit the calculate button. In a few seconds, you will know performance parameters such as combustion temperature, specific impulse, c-star, propellant density and more. You can print out a quick look of these parameters or a more detailed output including the exhaust chemical species and their concentrations.
Order by mail: You can mail your order to us and pay by personal check, business check or money order. Make sure you print clearly your name and shipping address. Mail your order to: CP Technologies; 3745 Studer, Unit A; Casper, WY 82604.
Periodically, the list of chemicals available in CHEM is updated so you have more ingredients to use in your propellant formulations. The list of propellant ingredients for CHEM Version 3 is in the file "pepcoded2.daf". The list of chemical ID numbers and their chemical names are in the files "Idnum.txt". We will also be adding more chemical species and reactions (jannaf2.daf file) to make CHEM the most accurate propellant thermochemistry program available to the consumer. Future updates to these files will be free and available on this page.
March 13, 2007 - There are no updates for CHEM at this time.