POWDERS
ADVANTAGES OF POWDERS
DISADVANTAGES
determined by the size of sieve they will pass through generally range from 0.1 to 10 micron in size
PARTICLE SIZE
indicates the number of openings in the mesh screen per inch.
SCREEN SIZE
medicated powders usually present in large quantities or volumes and are limited to non-potent substances
BULK POWDERS
DIVIDED POWDERS
TRITURATION
TYPE OF MORTAR & PESTLE
for solids to aid in dissolution in liquids
WEDGEWOOD
TYPES OF MORTAR & PESTLE
GLASS
LEVIGATION
common levigating agent
MINERAL OIL
GLYCERIN
PULVERIZATION BY INTERVENTION
Example of volatile solvent
ALCOHOL
ACETONE
SPATULATION
These substances include phenol, camphor, menthol, thymol, aspirin, phenylsalicylate, and phenacetin.
EUTECTIC MIXTURES
To diminish contact, powders prepared from eutrectic mixtures are commonly mixed with an
INERT DILUENT
prevents eutexia with aspirin, phenylsalicylate, and other troublesome compounds
SILICIC ACID (20%)
TRITURATION
GEOMETRIC DILUTION
SIFTING
TUMBLING
dispensed in bulk containers such as perforated or sifter can, aerosol container and wide-mouthed glass jar
BULK
dispensed in papers that are properly folded and placed in re sealable plastic
DIVIDED POWDERS