ZFS sand casings, precoated sand, hot
precoated sand, shell molding
What is ZFS sand casings, precoated sand castings,
hot precoated sand castings, hot shell and core
molding process, shell molding process?
The ZFS means Zinc Formaldehyde Sulfoxylate, which
is the main additive for the shell molding process.
So, all the above words mean a same sand casting
process, which we will call it as shell molding
process. Usually the procoated sand is yellow. They
are solid in the beginning, then they are hotted by
the shell molding machine, then they will become
liquid and be filled into the metal patterns, after
cooling, they will become solid again, and the solid
shell and core will be used for making the iron and
The advangtages of ZFS sand castings are good
surface quality, good dimensional tolerance, and
good inside quality. The disadvantages are higher
production costs, and lower production efficiency.
The attached are the machines which will be used for
making them, and the castings photos for your
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