PHA 327 - Exam 2 - Ointments 5
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Are ointments or creams better for oily/greasy skin?
What are pastes?
They are ointment like preparations with a high % of solids (up to 50% w/w)
What is an ointment like preparation that has a high % of solids?
How do pastes compare to ointments?
- They are stiffer
- Less greasy
- More absorptive
What are the four common solids added to ointments to create pastes?
- Zinc oxide
- Calcium Carbonate
Starch, Talc, Zinc oxide and Calcium carbonate are all used for what?
As solid additives to ointments to create pastes
What are the uses for pastes?
- make good protective barriers on the skin
- Surface coverage gives good protection against toxins
Why are pastes used diaper rashes?
They absorb the irritants in the diaper before they reach the skin, protecting from toxins
What is a gel?
A semi-solid, jelly-like material that can range from soft/weak to hard/tough
What is a semi-solid, jelly like material that can range from soft/weak to hard/rough?
What are the characteristics of gels?
- They are cross linked
- May exhibit no flow at rest
- mostly liquid
- Behave like solids
What gives Gels their characteristic structure?
Cross links within the fluid
What two types of gels are there?
What is a Hydrogel?
Network of hydrophilic polymer chains in a water dispersion medium
What is an Organogel?
liquid organic phase entrapped in a cross-linked network
What is the term for hydrophilic polymer chains in a water dispersion medium?
What is the term for a liquid organic phase trapped in a cross-linked network?
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