Share Chemical Reactivity Worksheet 4.0 The Chemical Reactivity Worksheet (CRW) is a free software program you can use to find out about the chemical reactivity of thousands of common hazardous chemicals, compatibility of absorbents, and suitability of materials of construction in chemical processes. Versions of the Chemical Reactivity Worksheet (CRW) were developed by collaboration of several organizations including the Center for Chemical Process Safety, Environmental Protection Agency, NOAA's Office of Response and Restoration, The Materials Technology Institute, Dow Chemical Company, Dupont, Phillips. CRW Overview Terms and Conditions Using the program Download/Install Training Videos FAQs Development History Chemical Reactivity Worksheet 4 (CRW4): End User Questionnaire CRW Overview ›