Highly uniform, Raj Ceramica Pottery Plaster is noted for outstanding performance and long life. The standard of the industry, it is the best material available for sanitary-ware and dinnerware slip casting.
Use 70% water for the weight of a given amount of plaster.
How to mix Plaster:
1. Always weigh out the amount of plaster you need, then look up the water by weight percentage.
2. Generally speaking the larger the percentage of water the softer and more absorbent the plaster will be. The harder the plaster the less water used.
3. Hot water will speed up the set time and cold water will slow it down.
4. Place the water in a suitable sized container. Always add plaster to water. Pour the plaster into the water and let slake for one minute. Mix by hand or with a Jiffy Mixer, being careful not to suck air into the plaster. When the mixture is lump free it is ready to pour; dont wait for it to start to thicken.
Raj Ceramica plaster solves many technical problems, such as…
- too fast setting: too fast setting time of plaster : means not enough time to release bubbles, which results in lower strength, so risks of breakage during the handling of molds
- long drying time: plaster with bad porosity will bring too long drying time of molds after usage
- inconsistency: inconsistency of plaster setting time (too short? : workers lack time to cast properly; too long? : lower molds output/shift) brings lower productivity and inconsistent quality of molds; therefore casting performance will be inconsistent
- surface problems: hard particles in plaster will destroy surface of your product
- black spots: high iron content in plaster will create black spots on clayware
- short mold life: low mechanical strength plasters yield too low mold surface hardness (therefore reduces mold life) and can’t be used in machine casting (ex. battery casting)
- set plaster lumps: plaster badly protected from moisture will have lumps that will destroy surface of clayware.
Those problems put the product quality of sanitary ware producers at risk and increase the costs a lot (bigger clayware waste, bigger plaster consumption because of shorter mold life, etc…). That’s where Raj Ceramica plaster wants to help !
Benefits with Raj Ceramica plasters
- Raj Ceramica offers plasters with convenient setting time; our executive team helps customers get the best casting performance, whichever their way of mixing plaster and water (hand mixing, conventional mixer, mason flow machine, etc…)
- Perfectly consistent setting time and demolding time, through formulation know-how, specific high tech process and on-line process parameters control, high frequency quality testing and ISO 9002 warranty.
- Pore size distribution in molds made with our plasters is homogenous, giving equal absorption power to every part of the mold
- Our plasters have no harmful impurities (iron, hard particles) because they are made with the purest gypsum which is perfectly cleaned before processing it further.
- We offer the best compromise of high strengths and high absorption , through use of specific chemical agents (competitors’ plasters often offer only high strengths OR high absorption)
- Our packaging is specially designed to prevent water to get in contact with plaster powder and form hard lumps in bags.