(a) Stability. A good uniform physical form with no oiling-off or feathering when added to coffee or tea.
(b) Viscosity liquid type.
(c) Whitening ability, which depends on the amount of solids present and the fineness of the dispersed phase.
(d) Flavour. A bland flavour and odour-free product is highly desirable.
(e) Flow properties. A spray-dried product must exhibit good flow and should not cake or clump.
(f) Easy dispersal. A spray-dried product must disperse easily and be non-hygroscopic.