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Optical photographs of the cross-section surfaces of the PU foams obtained with different tertiary amine catalysts, Amine 1 and Amine 2 at 1:3 ratio (Exp. 3), Amine 1 (Exp. 4), Amine 2 (EXP. 5) and Amine 3 (EXP. 6), at 70:30 reference polyol:Repolyol ratio, using the formulations presented in Table 5.
