Plaster Mold Casting


Plaster mold casting is just like the sand casting the difference is that the plaster of Paris is used instead of sand in mold making. Plaster of Paris is mixed with a fixed quantity of water to make a mixture which became rock solid in few minutes.



Steps involves in Plaster mold casting

Step 1

The first step is the making of the mixture. Plaster of paris is mixed with water or some other binder to make a thick mixture which become solid in few minutes


Step 2

Pattern is made of wood usually and sprayed with the thin layer of parting component in order to prevent the sticking of mixture with pattern


Step 3

Mixture is then poured onto the pattern and make sure that the pattern is completely  covered with mixture.


Step 4 

After the plaster is set. Patter is removed from the solid plaster


Step 5

Mold is not yet perfectly dry that’s why it is heated at 120 C to remove the excess water


Step 6

All the pieces of the mold are assembled and preheated and then molten metal is poured in the mold


Step 7

After the metal solidifies mold is broken to remove the parts





Advantages of Plaster Mold Casting


  • Better dimensional accuracy 
  • Good surface finish


Disadvantages of Plaster Mold Casting


  • Slow process
  • Moister effects
  • New mold needed every time
  • Mold will brake if over heated




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