Some SDM polymers contain modified diphenylmethane diisocyanate.
Inhalation overexposure to di-isocyanate can cause respiratory sensitization. A hyper-reactive response to even minimal concentrations of di-isocyanate may develop in sensitized persons. Sensitized persons should not be exposed to any mixture containing unreacted di-isocyanate.
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MarkCutkosky - 30 Jun 2008