What is Permeability? - Manufacturing Processes - 1

Q.  Permeability can be defined as the property of moulding sand
- Published on 03 Aug 15

a. to hold sand grains together
b. to allow gases to escape easily from the mould
c. to withstand the heat of melt without showing any sign of softening
d. none of the above

ANSWER: to allow gases to escape easily from the mould

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    Discussion

  • Pankaj   -Posted on 26 Oct 15
    - The property of moulding sand to allow gases to escape from mould is called as permeability. It is the ability of material or moulding sand to transmit gases.

    - Permeability of moulding sand decreases with increase in silt (soil or dirt) content of sand.

    - The density to which sand is rammed affects its permeability. If the sand is rammed excessively hard, its permeability decreases and vice-versa.

    - Permeability is measured in numbers such as 60, 80, 100, 120, 140, etc.

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