PROFESSIONAL MOULDING PLASTER
Molding gypsum: for the production of molds, models and products in the porcelain, ceramic and faience industry.
Amphore Cast is an unformulated plaster used in ceramics to produce working moulds for slip casting in sanitary ware and tableware industry.
Plaster / water ratio: 1,33:1
Chemical properties: CaSO4H2O
Minimum gypsum purity: 90%
Flexural strength: 2,3
Initial setting time: 10min
Final setting time: 25min
The recommended plaster to water ratio in between 1,25:1 and 1,40:1, with a mixing time a approx.2 to 4 minutes, depending on batch sized plaster shop process.
Water and plaster must be measured carefully to ensure constant performances. The precise consistency to use will need to be adjusted to suit the individual application. Changes to plaster o water ratio will influence product performance particularly setting time, strength and permeability.
PLASTER FOR RAM PRESSES
We offer one of Saint Goben France's finest products to create high-quality mats for RAM presses where sustainability and porosity are of utmost importance. It is produced in Germany entirely from natural materials.
Recommended gypsum / water ratio of 3: 1
Wetting Time - 18-23 min
Pore volume - 21%
- Bending strength - 11.5MN / m2
- Compressive strength - 43,6MN / m2
- Brinnell hardness 155 MN / m2
Sieve Analysis - +200 micron max 0.04%
How to work
The temperature of gypsum and water should be approximately the same - within 15-20oC. The gypsum is added slowly to the entire amount of water and is kept for about 2 minutes to take it. Stir with a mixer, depending on the amount of time the mixer turns and the amount of gypsum (6-12min). It is recommended to stir under vacuum. After mixing, the gypsum temperature must be measured. The matrix is then poured. Its temperature is also measured. When it rises to 6-8 ° C, air is fed to release the pores. Initially, the pressure was 0.5 bar and increased every 30 seconds by 0.5 bar until a pressure of 5 bar was reached when it was held for 30 minutes until the matrix dried. Then wait no less than 12 hours to harden.