Download/Install

Downloading, Installing, and Running the Chemical Reactivity Worksheet

The fourth generation of the Chemical Reactivity Worksheet (CRW) was released for public distribution in March of 2016. Download statistics indicate wide global interest and usage with very few problems being reported.

Recently, it was discovered that, for a few reactive group combinations, the CRW did not accurately predict potential hazardous reactions. Upon notification of this, a thorough review of all reactive group combination hazard predictions was conducted.

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Downloading the CRW

Download the appropriate version of the Chemical Reactivity Worksheet (CRW):

CRW 4.02 for Windows [Windows Executable, 96.6 MB]:

Operating System Compatibility (only those listed are supported):

·         Windows 10 Pro or Enterprise Edition

·         Windows 8.1 Standard or Pro Edition

·         Windows 8 Standard or Pro Edition

·         Windows 7 SP1 Ultimate, Professional, Home Premium

Download CRW 4.02 for Windows

CRW 4.02 for Mac  [Zip, 188 MB]:

Operating System Compatibility (only those listed are supported):

·         OS X El Capitan v10.11

·         OS X Yosemite v10.10

·         OS X Mavericks v10.9

Download CRW 4.02 for Mac

Installing and Running the CRW

On a Windows PC:

Once you have downloaded the installation program, double-click on the "CRW4 Setup.exe" file icon, and then follow the directions you'll see on your screen.

To start the CRW, open the Start menu, point to Programs, and then click "CRW4." Follow the directions on your screen to learn how to use it.

On a Mac:

The CRW has been compressed as a zip file so that it can be downloaded more easily from the Internet. You should see a folder called "CRW4" on your desktop once the program is uncompressed. Feel free to move this folder on your computer as desired.  It is common to place it in the "Applications" folder on your Mac.

To start the CRW, open the CRW folder, and then double-click the CRW4 application. Follow the directions on your screen to learn how to use it. 


Questions: Contact us with questions, comments, or suggestions about the Chemical Reactivity Worksheet.