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 Post subject: PM: casting in concrete
PostPosted: Sun Jun 03, 2012 10:41 am 
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Joined: Wed Aug 20, 2008 7:30 pm
Posts: 50
Location: Central Arkansas
(Popular Mechanics, January 1945, page 145)

"In casting small objects from soft metals, I have four that portland cement mixed with silicate of soda provides good molds for the work. Enough soda is used to make a mixture of the right consistency for easy shaping of the molds. Such molds stand up well for casting toys, small statuary, etc. I have also used them for casting aluminum and zinc as well as brass."

[illustration of a normal cope and drag two piece mold]
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