1 Pint Darvan 7 is a deflocculant that is similar to sodium silicate. However, unlike sodium silicate, Darvan 7 does not erode plaster molds. As a deflocculant, Darvan 7 weakens the electrical attraction between clay particles and thus acts as a thinning agent in slips and as a general dispersing agent for clay bodies and glazes. It is mainly used to enhance the fluidity of casting slips and maintain or slow the shrinkage rate. Darvan 7 is typically preferred with porcelains and high iron content clay, while Darvan 811 can be used for stoneware, high fire slips and red low fire slips.Slips that are prepared with Darvan 7 show little tendency to thicken on standing, which is why it is often used in glazes. Darvan 7 can also be added to joining slip, which is ideal because it allows one to use less water and results in less shrinkage at attachment points.Darvan is not a suspension agent, and will not prevent your glaze from settling. It will make settling worse. Epsom Salts can be used to help glazes stay is suspension. Note: Darvan will be damaged if frozen. Therefore, we suggest caution if ordering for shipment to cold regions during the Winter seasons. Please note Darvan products do have a shelf life. Darvan 7 has a 2-year shelf life. SDS/Product Info Sheet
