Soda Ash (a.k.a. soda ash light) – Na2CO3 (m.p. 900o F/490o C) sodium carbonate is a very active flux for low temperature glazes (below cone 5). However, it is water soluble and is generally used in fritted form to prevent recrystallization in the glaze suspension. Soda Ash is also used in small amounts as a deflocculant in clay slips to reduce the amount of water needed to make the slip fluid.