Most metal castings are made by pouring molten metal into a prepared cavity and allowing it to solidify. The process dates from antiquity. Investment casting (the lost-wax process) is one of the oldest metal “casting” process known to man.
The industrial process, “investment casting” as it is now termed was developed in the early 1940’s. The process is unique in the spectrum of “casting techniques” through its ability to produce as-cast component possessing a very high degree of dimensional accuracy and surface finish, combined with virtually unlimited freedom of design.
Over the past 40 years, investment castings have been used extensively in many applications primarily because of their excellent characteristics. The majority of investment castings weigh less than 3kg, but there is a trend to produce larger castings in the 5-15 kg range. Castings weight up to 400 kg have been poured in this process