Thesemelamineparticlesarecrosslinkedbyacid-catalyzedreactionwithformaldehyde.Theparticleshaveamuchhigherdensity(1.51g/cc)thanpolystyrene,arehydrophilicwithamineandmethylolaminegroups,and,beingcrosslinked,arenotnoticeablyswelledbyorganicsolvents.Theparticlescanbelyophilizedandthenredispersedinwater.Theparticlesaresuppliedasasuspensionof2.5%solidsinwater.
~1.00µm