Ceramical Gypsum Plaster: Designed for use in pressing clayware. Exceptional strength with consistent absorption. Store indoors. Shelf life 90 days.
Mix Ratio: 33:100
Expansion: 0.13%
Crush PSI: 6000
Set Time: 18-23 min
General Mixing instructions –
Your mixing container and equipment should be clean and free of all previous plaster mixing debris. Old plaster will cause your new mix to set irregularly and at a faster rate.
Water needs to be carefully and specifically measured. Water temperature is very important to your set time. Testing water is at 70°F – use a thermometer! Hotter water will speed up your set time, cooler water will slow and retard the set time.
Plaster mixes into water: sift your plaster into the pre-measured water, allow to slake for 30 seconds and mix time will be about 30 – 60 seconds. Plaster ages, it is hydroscopic. Older plaster may require less water.
For USG7:
• Mix should be 16.5 pounds water to 50 pounds USG7.
• Sift plaster slowly and evenly into water
• Allow to soak for 2-5 minutes (less time for smaller batches).
• Mix 10 minutes with high-speed mixer. Pour within 2 minutes of mixing.
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