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. 2021 May 26;13(11):1736. doi: 10.3390/polym13111736

Figure 3.

Figure 3

Optical photographs of the cross-section surface of the reference foam and of PU foams obtained at different reference polyol/recycled polyol ratios, 90:10 in EXP. 1, 80:20 in EXP. 2 and 70:30 in EXP 3 (the formulations are presented in Table 1 and Table 4).