A long-chain sodium polyelectrolyte best suited to deflocculate low-fire, white “hobby” clays. It produces slips with a long casting range, and excellent mold-release properties. Ware can be removed as soon as 1-2 hours (depending on size) or left as long as 6-24 hours (provided that the drainhole is covered). This allows larger and/or more intricate forms extra set-up time for safer handling and reduced warpage. Slips made with Darvan® No. 7-N have an increased shelf life because they don’t thicken or become thixotropic upon standing (a common problem with many “hobby” slips). During casting, there is minimal absorption of Darvan® No. 7-N by the plaster resulting in greatly increased mold-life as well as scrap that can be... Read More
A long-chain sodium polyelectrolyte best suited to deflocculate low-fire, white “hobby” clays. It produces slips with a long casting range, and excellent mold-release properties. Ware can be removed as soon as 1-2 hours (depending on size) or left as long as 6-24 hours (provided that the drainhole is covered). This allows larger and/or more intricate forms extra set-up time for safer handling and reduced warpage. Slips made with Darvan® No. 7-N have an increased shelf life because they don’t thicken or become thixotropic upon standing (a common problem with many “hobby” slips). During casting, there is minimal absorption of Darvan® No. 7-N by the plaster resulting in greatly increased mold-life as well as scrap that can be easily reclaimed - sometimes by adding only water. Darvan® No. 7-N is very powerful requiring only a .5 to 1% addition (based on dry body weight) to the formula. Even so, adding excess Darvan will not cause the slip to re-flocculate. In addition, Darvan® No. 7-N is an excellent deflocculant/dispersing agent in glazes to be applied by spraying, providing increased fluidity without the addition of excessive amounts of water, and keeping the materials evenly-dispersed in the glaze while you work.
Darvan® No. 7-N has a shelf life of 1 year or more if stored in a tightly closed container. Temporary freezing will not effect its properties; however, the thawed material must be thoroughly re-mixed before using.
