Kirksite die was mentioned by L.D. Miles in his 1961 book on value analysis and value engineering.
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Even in 2018 it is a useful material.
References regarding Kirksite
https://www.eazall.com/mold-base-kirksite
http://www.armstrongrm.com/pages/rapidarticle.html
http://www.armstrongrm.com/pages/kirksitearticle.html
Combining the cast kirksite tooling process with RP and CAD improves prototype, bridge-to-production and short-run parts injection molding.
Modern developments in RP techniques facilitate process streamlining-making cast kirksite tooling a superb tool for reducing time-to-market with minimal capital expenditure.
http://www.armstrongrm.com/pages/kirksitearticle.html
