Pottery Plaster is used to create moulds for slip casting and general casting applications. Pottery plaster is also used for clay reclaim batts. Pottery plaster is harder than Plaster of Paris. So, it is better for casting molds that experience wear and tear, and therefore great for casting moulds. Once dry, your object is ready to be painted, varnished and decorated. Available in 2.5kg resealable bags. Setting time varies greatly depending on the size of your mould and environmental conditions but is approximately 10-20 minutes. Storage: Store undercover in a dry environment and protected from temperature extremes. Preparation: When using pottery plaster, it is important to record the water/plaster ratio used in trials so that mixes can be adjusted according to experience. Weighed quantities of plaster should always be used, as the bulk density is variable and measurements by volume is unreliable. Strength, hardness and density of a plaster cast are directly related to the quantity of water used for gauging, which should be kept to a workable minimum. Water/Plaster ratios differ for each method of casting and are approximately: Slip Casting - 5 liters to 7kg; Plaster Craft - 5 liters to 7kg. Mixing: Always use clean cold potable water and clean containers and tools. Weigh plaster and measure water accurately for each mix to ensure uniform moulds or casts. For best results slowly add powder to water (never add water to plaster) and allow powder to soak for 1-3 minutes. Mix by hand or with a power mixer (max. of 400rpm) - mixing at higher speed will draw air into the mix creating air bubbles. Mix until a smooth workable paste has been achieved. Pour the plaster into the mould, tapping or vibrating the mould to avoid the introduction of air bubbles. Allow the plaster to set completely before removing the mould. Once setting has commenced, the material cannot be remixed and should not be agitated or retempered by the addition of water. Dry plaster moulds, casts and objects thoroughly. Health and Safety: Do not ingest contents of package. Avoid creating dust when handling, mixing or sanding. Ensure adequate ventilation and wear eye protection, gloves and a disposable respirator. Dust from this product is classified as hazardous and may contain crystalline silica. Keep item out of reach from children. Do not attempt to make an enclosed cast of any body parts such as hands or fingers. This product gives off heat when mixed with water for setting, which may result in serious skin burns if used for casting body parts.
