Fact Sheets What you want to know about Solstice yf, its impact on the environment, and safety in use. F-Gas Regulation and MAC The EU MAC Directive 2006/40 mandates that all new car types have a refrigerant with a GWP of less than 150 as of January 2011. CRP Project The automobile industry’s Cooperative Research Project. Pre-Market Testing Safety always comes first. We follow rigorous test protocols in product development to ensure a substance can be used safely. Intellectual Property Innovation is often followed by intense interest, excitement, and sometimes, challenges. Honeywell addresses some of these in a Q&A format here Safety Solstice yf refrigerant has been verified as safe to use in automobiles through extensive third-party testing.