HS CodesVI · Products of the chemical or allied industries29 · Organic chemicals2912291250291250Chapter 29Copy pageCyclic polymers of aldehydesDescriptionAldehydes, whether or not with other oxygen function; cyclic polymers of aldehydes; paraformaldehyde : Cyclic polymers of aldehydesWas this page helpful?YesNoPrevious291249OtherNextParaformaldehyde291260