Why Compacted Graphite Iron?
In 1949, a now well-known material called ductile iron was patented. At the same time, a lesser-known material called Compacted Graphite Iron (CGI) was also patented, though it was just considered a curiosity at the time.
While ductile iron became a manufacturing staple, CGI never was seriously utilized despite possessing some very interesting properties. While not quite as strong as ductile iron, CGI is 75 percent stronger and up to 75 percent stiffer than gray iron.
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