Darvan No. 7 Dispersal
Darvan No. 7 is used to disperse ceramic suspensions to minimize their water content. It is an alternative to the long popular sodium silicate. About twice as much is required but Darvan No. 7 does offer a number of advantages. Typically soda ash is not needed as a complement and Darvan No. 7 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. Slips prepared with Darvan No. 7 show little tendency to thicken on standing.