Page 252 - Pharmaceutics IV (02-06-01305)

3/30/24

Expelled product

• Aerosol products may be designed to expel
their contents as a fine mist; a coarse, wet, or
dry spray; a steady stream; or a stable or a fast-
breaking foam.

• The physical form selected for a given aerosol
is based on intended use.

Prof Alyaa Ramadan, ceutics, AU

11

Final expelled product

Space aerosol. • Space aerosols: mist>>>> dispersion
of particles or droplets which remain in
Surface coating aerosol air for prolonged periods (particles or
Topical aerosol droplets < 50 μm in size).
E.g..Insecticides,disinfectants..
Foams
• Topical aerosols : Surface coating
aerosols: film >>>>produce a film on
the surface treated (relatively larger

particles or droplets 50- 200 μm), e.g.

• Foams>>>> expansion of propellant
within an emulsion results in

production of small bubbles, e.g
shaving foam.

Prof Alyaa Ramadan, ceutics, AU

12

6