Mold making gypsum is one of the types of gypsum produced in Razi gypsum factory in Semnan T for the production of which micronized gypsum is used.
In this way , in the last step , by performing the process of adding and adding a special material , it bcomes molding plaster.
The higher strength of this product and its finer granulation than construction plaster is one of the reasons for using this product to produce mold.
This type of plaster is made from gypsum powder and special additives and is used in various industries such as casting , sculpture and molding .
The setting time of this type of plaster id favorable and after drying , it will have high strength and durability .
This product is offered in dommestic and foreign markets in 30 and 40 kg packages .
| Value | Unit | Property | No |
|---|---|---|---|
| 12-14 | Min | initial Setting Time زمان گیرش اولیه | 1 |
| 25-30 | Min | Final Setting Time زمان گیرش ثانویه | 2 |
| 4.5-5.5 | % | Crystal Water آب کریستالی | 3 |
| 2.8< | N/mm2 | (2Hours)Bending Strength مقاومت خمشی 2 ساعته | 4 |
| 3.8< | N/mm2 | (72Hours)Bending Strength مقاومت خمشی 72 ساعته | 5 |
| 200 | Micron | Mesh دانه بندی | 6 |
| 6 | Min | Mixing Time زمان ترکیب آب و گچ | 7 |
| 100 | GR | Amount of water مقدار آب | 8 |
| 135 | GR | Amount of gypsum powder مقدار گچ | 9 |
| 35< | % | Water Absorption جذب آب | 10 |
| 93< | % | (Minimum Percent)Whiteness درصد سفیدی | 11 |
