Permeability of a foundry sand is:
Porosity to permit the escape of gases/air
Fineness of sand
Distribution of binder in sand
Capacity to hold moisture
Porosity to permit the escape of gases/air
Permeability of a foundry sand is the
porosity of sand to permit the escape of gases/air. It is expressed by
permeability number (Pn)
Where,V = Volume of air passing through the specimen.
H =
P =
A=
T=
Hence, the correct option is (A).
&Key Points:-
Generally, permeability number lies between 60 and 120.
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