What are the chemicals used to make spray polyurethane foam?
A-Side or Iso – The acronym MDI was derived from one of the chemicals many names, methylene diphenyl diisocyanate. Polymeric MDI (PMDI) is a mixture of monomeric MDI and polymeric MDI and is a brownish liquid at room temperature. MDI/PMDI is one component used in the application of SPF products; typically referred to as the A-side or iso-side of the system and requires special handling and care. B-Side or Resin – This side is also known as the polyol blend, and is comprised mostly of polyols, with smaller amounts of catalysts, blowing agents (closed cell foam only), flame retardants and surfactants. Special handling and care is also required. What are potential health hazards of SPF chemicals? Consult the MSDS for the specific hazard information for the product. A few key points are presented here. A-Side – Inhalation overexposure can cause 1) irritation of the nose, throat, and lungs, causing runny nose, sore throat, coughing, tightness in the chest, and shortness of breath, and 2) re
