Sand Inclusions
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Sand inclusions are from loose moulding sand or sand erosion. Loose sand lying in the running system will be trapped by an efficient filter but sand lying in the mould cavity will not be affected by a filter. A filter is not a substitute for proper sand practice.
Friable mould surfaces can cause dirty moulds and sand inclusions in the casting and dextrin corrects friability problems.
Sand inclusions which occur in the same way as in grey iron.
Cellular filters divide the metal stream into very small channels. Dross, slag, and sand inclusions are collected on the filter face and along the internal filter cell walls.
