CO2 and sodium silicate molding

Does my member of this group have experience with CO2 + sodium
silicate molding foundry sand? My question is how to best "gassify"
the prepared sand after molding. Thanks, David
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This subject was beat to death recently on the castinghobby email list . Several suggestions surfaced , but the winners were to attach a long bigbore hypodermic needle or a ball filling needle to a hose , fed from a regulator at around 3-5 psi . Insert gently and let'er flow . Also suggested were the small cartriges that are used for CO2 pistols and tire inflators , but there were some problems with regulating the flow .
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Terry Coombs

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