The addition of small amounts of Na2CO3, or of Na2Sio3 increases the plasticity of some clay slips and permits them to be cast when they contain a much smaller percentage of water. This permits a much more rapid casting. Casts were made and removed from the mould in 20 minutes. The time for a cast increased for successive casts as the mould became filled with water. After drying the original rate was possible. A mixture of Na2CO3 and Na2Sio3 was found to be superior to either alone. The use of these salts did not injure either the mould or the quality of the pieces cast. As many as 100 pieces were cast in one mould.
Proceedings of the Iowa Academy of Science
©1926 Iowa Academy of Science, Inc.
Brown, F. E. and Lai, Chi-fang
"The Effect of the Addition of Sodium Carbonate and Sodium Silicate on the Casting Properties of Clay Slip,"
Proceedings of the Iowa Academy of Science, 33(1), 170-170.
Available at: https://scholarworks.uni.edu/pias/vol33/iss1/25