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Table 3 Characteristic FTIR features outlined for the 2KSBPU, 2KWBPU (based on PUDs), 1KWBPU and 2KFPU reference samples used in this study

From: Polyurethane coatings used in twentieth century outdoor painted sculptures. Part I: comparative study of various systems by means of ATR-FTIR spectroscopy

2KSBPU 2KWBPU 1KWBPU 2KFPU Attribution
2940–2930 (m) 2940–2930 (m) 2940–2930 (m) 2940–2930 (m) Urethane
2860–2855 (m) 2860–2855 (m) 2860–2855 (m) 2860–2855 (m) Urethane
1735–1720 (s) abs. 1735–1720 (vs) abs. Polyester and/or acrylic polymer
1690–1680 (vs) 1690–1680 (vs) abs. 1690–1680 (s) HDI isocyanurate
1640–1630 (m) 1640–1630 (m) 1640–1630 (m) 1640–1630 (w) Urethane
1575–1565 (m) 1575–1565 (m) 1575–1565 (m) 1575–1565 (w) Urethane
1455–1450 (s) 1455–1450 (s) abs. 1455–1450 (m) HDI isocyanurate
abs. abs. abs. 1110 (vs) Fluorinated polymer
abs. abs. abs. 1065 (vs) Fluorinated polymer
765–760 (s) 765–760 (s) abs. 765–760 (m) HDI isocyanurate