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St. Paul

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Oil Sand Core Process

Oil sand is a baked core process. Cores are made in open or split boxes then baked in an oven.


Oil is typically mixed with silica sand, wood flour, and iron oxide. It is mixed in a small mullor. The sand is packed by hand into a box with the shape of the internal configuration. Cores are place in a rack then baked in an over for about 4 hours at 350 to 400 degrees F.

St. Paul Foundry
954 Minnehaha Avenue West
Saint Paul, Minnesota 55104
(651) 488-5567  Fax: (651) 488-0908
Sales: (651) 312-4734 email

100% Manufactured in the USA      Copyright 2017