How can I dissolve dried plaster of paris?

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SUMMARY

The discussion focuses on effective methods to dissolve dried plaster of Paris, specifically in the context of an Arch 10 scale model project. Key techniques include using water and time, applying acid or sugar to accelerate the process, and converting the dihydrate back to hemihydrate by baking at 150°F for several hours. The estimated time for the heating process ranges from 2 to 24 hours, depending on the thickness of the plaster.

PREREQUISITES
  • Understanding of plaster of Paris and its chemical properties
  • Knowledge of heating techniques, specifically at controlled temperatures
  • Familiarity with the effects of acids and sugars on chemical compounds
  • Basic skills in handling materials for model making
NEXT STEPS
  • Research the chemical properties of plaster of Paris and its hydration states
  • Learn about the effects of different acids on plaster materials
  • Explore techniques for controlled heating, including microwave methods
  • Investigate alternative methods for removing hardened plaster from surfaces
USEFUL FOR

This discussion is beneficial for architecture students, model makers, and anyone involved in projects utilizing plaster of Paris who seeks effective removal techniques for dried materials.

ninapilapil
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My groupmates and I were using plaster of paris for our Arch 10 scale model of a chair. We used a glass casserole for the first trial. Kind of stupid. We covered it with oil before putting in the mixture but when the mixture dried, we couldn't get it out anymore. How can I dissolve plaster of paris?
 
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Water and time will eventually get it out. Acid or sugar will accelerate it somewhat.

You can convert the dihydrate back to the hemihydrate by baking it at 150F for several, perhaps many, hours. It should then crumble easily.
 
chemisttree said:
Water and time will eventually get it out. Acid or sugar will accelerate it somewhat.

You can convert the dihydrate back to the hemihydrate by baking it at 150F for several, perhaps many, hours. It should then crumble easily.

An estimate of how long?
 
ninapilapil said:
An estimate of how long?

For the heating step? It should take from 2-4 hours but depending on the maximum cross section the water must traverse on the way out, that could increase significantly... perhaps as much as a day or more.

http://www.lpi.usra.edu/meetings/lpsc2007/pdf/1432.pdf"

http://cr4.globalspec.com/thread/25981/Gypsum-dehydration"

I like the idea of microwave heating. Heat slow at first and then ramp up the power.
 
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