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”. Future updates to these files will be free and available on this page.

Update (March 26, 2022): The chemical ingredient list shown when you open CHEM and click on the ID number list may not reflect all the ingredients actually included with CHEM. To check to see if you have a complete list, open CHEM and click on the ID Number List button. Look for Sorbitol as ingredient 1107. If you have it, then your list is up to date. If you do not have it, then you can manually install the correct list. First, download the CHEM update instructions. Then, download the Idnum.txt file. You do not need to download or install the PEPCODED2.DAF file. Follow the CHEM update instructions for a manual install, but only change the Idnum.txt file. Do not change the PEPCODED2.DAF file.

Update (May 23, 2020): The chemical ingredients for CHEM have been updated. To determine if you have the latest chemicals, open CHEM and click on the ID Number List. Look for Saran Powder in the list which is mostly arranged alphabetically. If you have Saran Powder, your list is current and up to date. If you do not see it, then your chemical ingredient list is not up to date.

There are two methods to updating the chemical ingredients in CHEM for your propellant formulations. The first is to download the updater program (Automatic Update Software button), which will automatically do the update for you. After you download the zip file, you will need to upzip it to obtain the executable file. Then, run the executable file as System Administrator.

The second is to download the two files with the new ingredients and place them into the appropriate file directory yourself. In either case, you need to download the update instructions. Click on the CHEM Update Instructions button to download the PDF file with the update instructions. Read the instructions and decide if you want to run the update software or update CHEM manually.