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16
04
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chapter 4 - page 9
Specialties
With the mixing parameters “Specialities” surface-active or sensitive active substances or force
sensitive foundations can be processed.
As an example, metronidazole, chlorhexidine gluconate, Linola
®
.
Therefore with suspension ointments < 2 %
fi
rst use the “pre-grinding” parameters and for the
main mixing process the mixing parameters “specialties”
Level 4 (1200 rpm)
Jar size
15 - 30 ml
50 - 100 ml
200 ml
300 - 500 ml
Time (min.)
5:00
7:30
12:55
17:00
Stirrer
Disp. Blade or SMB
Disp. Blade or SMB
Disp. Blade or SMB
SMB
Requirements for the Components of a Formulation
Powder
Generally, powders should be used as micro
fi
ne and micronized substances.
In order to ensure better wetting of powders in aqueous compounds, micronized substances
should be added after any liquid components or covered with foundation.
For a solids content less than 2 %, we recommend applying the pre-grinding process together
with approx. 30 % of the ointment foundation (review pre-grinding).
Crystalline Active Substances
We recommend pulverizing active crystalline ingredients in a mortar prior adding into the jar to
avoid complex post processing (e.g. ointment mill). Should a solvent for the active crystalline
component be part of the formulation, the ingredient may then also be dissolved in the jar, for
example urea with water.
Then the remaining formulation component/s can be added. If the solvent is in su
ffi
cient
amounts a component of the ointment foundation the crystalline substance may dissolve
during the mixing process.
tab.: mixing parameter Specialties