The heading text for 390530 explicitly includes polyvinyl alcohol 'with or without unhydrolyzed acetate groups,' so partial hydrolysis does not displace the product from this subheading. Fully hydrolyzed and partially hydrolyzed PVOH grades both belong here, regardless of the degree of hydrolysis, as long as the product is commercially identified and sold as polyvinyl alcohol.

390512 covers homopolymer dispersions—polyvinyl acetate only—while 390521 applies to copolymers of vinyl acetate with another monomer (such as ethylene or acrylate) in aqueous dispersion. The producer's monomer composition data is the determining document; an ethylene-vinyl acetate emulsion, for example, goes to 390521, not 390512.