ABSTRACT
All plasticizers are liquid, semi-volatile organic compounds which "may volatize" at normal temperatures. Increased heat increases the amount of plasticizer evaporation. Higher molecular weight plasticizers have a slower loss rate than lower molecular weight plasticizers. Loss of plasticizer in plastic building materials can be observed by one or a combination of the following: Reduction in weight, light reduction in thickness, Increase in strength, Decrease in flexibility and increased brittleness. In building materials, a loss of plasticizer may be more subtle such as hardening of spray-on foam sealant or panel insulation both of which are hidden in the wall cavity or above the ceiling. Knowledge of the plasticizers can aide one in assessing potential emissions and health impact. Phthalate plasticizers are produced by reacting phthalic anhydride with alcohols. In building materials, Chlorinated paraffins (CPs) are used as secondary plasticizers in polyvinyl chloride (PVC) polymers as well as in paints, adhesives, sealants, caulks, and rubber.
