Laguna Darvan #7 (解凝劑) 8oz

Darvan#7 is a deflocculant used to disperse ceramic suspensions to minimize their water content. It is a liquid alternative to the long-popular sodium silicate. A typical proportion in an easy-to-deflocculate porcelain is about 0.35 Darvan#7 to 100 clay powder.

For an iron-oxide-containing stoneware up to double that might be needed. Darvan has advantages over sodium silicate. Typically soda ash is not needed as a complement and Darvan does not attack plaster molds. In addition, slurries are much less sensitive to over-deflocculation and are more stable. It is thus easier to reprocess scrap. However, a number of engineers still prefer using a sodium silicate:soda ash mix to control thixotropic properties better, especially if little scrap is being added.

*Our darvan#7 has been repackaged for better usage. There is no dilution or processing, and the firing effect is the same.