| Polyester polyol | |||||||||
| TnBT | Butyl titanate, high activity and purity | ||||||||
| four hundred and thirty-six | Titanium catalyst resistant to hydrolysis, high activity, good resistance to yellowing | ||||||||
| three hundred and seventy-one | Water based titanium catalyst, high activity, good resistance to yellowing | ||||||||
| TE | Anti hydrolysis titanium catalyst, high activity, good anti yellowing effect | ||||||||