Session 402 - Remediating B-side Residue In/On Substrates After Off-Ratio Foam Has Been Removed - Henri C. Fennell

IAQ & Energy 2019 Conference, Session 402: This program introduces a method for neutralizing SPF B-side unreacted chemicals in and on substrate materials. Spray foam manufacturers typically provide this information for A-side chemicals in the “accidental release” section of their SDSs; however, this information is not provided in the B-side SDSs. It is the unreacted B-side components that can produce odors and/or long-term health problems related to off-ratio SPF. If the A side is the surplus component, it will generally not produce odors/health hazards because isocyanates react with moisture and become inert in a relatively short period of time (hours or days). For these reasons, I consider A-side exposure primarily an installer risk, with PPE and engineering controls to be the appropriate worker protection required while the isocyanate is aerosolized into the air during and immediately after the spray application.