Favourably differ from all another knitting the increased durability, thinner thickness of a grinding. All these qualities are necessary by production of porcelain products and positively influence quality of a surface of products, turnover of forms and models increases.
Production of plaster - is made of a natural plaster stone by its crushing, steaming in autoclaves, drying and a grinding in spherical mills with the subsequent separation in a separator.
Construction plaster is subdivided on terms of its skhvatyvaniye:
And - fast-setting plaster (the beginning of a skhvatyvaniye 2 minutes, the end - no later than 15 minutes)
B - normally grabbing (the beginning of a skhvatyvaniye of the 6th minute, the end - no later than 30 minutes)
In - slowly grabbing (the beginning of a skhvatyvaniye not earlier than 20 minutes, the end of a skhvatyvaniye is not normalized)
Durability of plaster is defined by 12 brands on compression:
It is G-2, G-3, G-4, G-5, G-6, G-7, G-10, G-13, G-16, G-19, G-22 and G-25. Where the figure means strength on compression - 1 MPa (10kg/cm2)
In other words plaster of 16 - its durability makes 16 MPas.
For a plastering use generally plaster of brands g2-g7.
Plaster is a knitting substance which extends and heats up when curing. In a plastering expansion of plaster is positive property as at the same time it gets into the smallest reliefs of a form.
Plaster should be prepared very quickly and to use right there. If long to stir the plaster beginning to harden in water, then it otmolazhivatsya and ceases to harden and grab. It is necessary to store plaster in densely tied plastic bags that air, especially damp since plaster differs in low water resistance did not get. Plaster is not recommended to store a long time.