It is well known that the castability depends on many different factors and also many researches on these factors have been reported. The reported methods are valuable in laboratory but in practical works, they are too difficult to utilize. In fact, it is necessary to judge the many factors affecting the castability at the same time and synthetically in factories, Finary, this problem is solved when the casting is practically carried out but it is economically impossible to solve it theoretically. Accordingly, instruments are desable that slow the defects based on many factors macroscopically with less materials and with accuracy. Many types of test moulds were designed and examined practically by the author and a quite original test mould was perfected. This test mould revealed a good capability in jadging the castability of 18 aluminium casting alloys and has been put to practical use in many factories and laboratories in Japan.
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