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Table 2 Lignin content in rigid polyurethane foams

From: Effect of replacing polyol by organosolv and kraft lignin on the property and structure of rigid polyurethane foam

Ratio of lignin to polyol 25/75 50/50 60/40 70/30
HKL in PU foam, % (w/w) 9 19 23 28
HEL in PU foam, % (w/w) 12 25 30 36
  1. Note: Ration of lignin to polyol, molar ratio of the hydroxyl groups from lignin to those from polyol (Voranol 270). HKL, hardwood kraft lignin; HEL, hardwood ethanol organosolv lignin; PU, polyurethane.