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1. Degree of Hydrolysis PVA is produced with varying degrees of hydrolysis, typically ranging from 80% to 99%. This percentage indicates the extent to which the acetate groups have been converted to alcohol groups. Higher hydrolysis levels generally promote better water solubility. For instance, PVA with a hydrolysis degree closer to 100% has superior solubility due to the increased number of hydroxyl groups that can interact with water molecules.