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In the block forming conveyer, steam is passed through the foams to cure the <br /> prepolymer, and this area is vented at VB4. Some isocyanate fumes escape as <br /> the steam reacts with the prepolymer. <br /> We hope that this answers the questions , and that the tabulation for the first <br /> two is clear. Please telephone if there are any further questions. <br /> Yours truly, <br /> E. R. CARPENTER COMPANY, INC. <br /> 1 car i/1 G r1. 6'4 <br /> David Friend <br /> DF/sc <br /> cc : Ed Malechek <br /> E. R. Carpenter <br /> La Mirada <br />