Abstract
Abstract : Molecular film contamination is detected and monitored using a gravimetric laboratory process described in ASTM standard methods. These processes currently specify the use of methylene chloride as a rinsing and wiping solvent. Methylene chloride, however, is an organic solvent targeted for reduction by the Environmental Protection Agency. In this report, we describe a request for a change in the solvent specified by the ASTM standard procedure. We review the criteria for the suggested replacement, ethyl acetate, for use in nonvolatile residue (NVR) testing. The solubility criteria assembled for the replacement of methylene chloride are then used to evaluate the replacement of methlyene chloride-based paint removers. It is found through an examination of the literature that paint removal is a complex procedure that cannot be described solely by solubility parameters. The general state of paint removal technologies that do not use methylene chloride is reviewed. The EPA survey of maximum achievable control technologies (MACTs) for paint removal suggests that flashlamp exposure followed by either wet or dry media blasting is the best alternative for paint stripping tasks.
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