Posted by John Odom on May 26, 1999 at 07:39:13:

In Reply to: moulding sand mixture? posted by tree on May 23, 1999 at 18:08:49:

I have been reading on this subject. There are some natural sands that work in the as found condition.

Most industrially used sands use about 5% bentonite, a special clay as the binder.

Porter-Warner Industries here in Chattanooga (423-266-4735) are major international suppliers of moulding sands and additives I have a friend that used a 50# sack of their PetroBond additive to 1000# of dried brick sand and got good results.

I am using some sand donated by a local foundry, I haven't tried a home-mix yet.

John Odom

Chemistry teacher, Chattanooga School for the Arts and Sciences

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