Darvan 811 is a deflocculant that is similar to Darvan 7, but is more powerful. It takes only a small percentage to deflocculate slip. As a deflocculant, Darvan 811 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 811 is used successfully in vitreous and semi-vitreous clay bodies and in glazes. It can be used for stoneware, high fire slips and high iron clay bodies, while Darvan 7 is typically preferred with porcelains.