2.1.2 Test
Structure: thickness (1.5-3 cm), tough, sure.
The colors: ivory, not the color of mold
pH: 5.0
2.1.3 Preservation
crude Thach after entering the company and is contained in the storage tank to wait until the date of manufacture. Crude gypsum storage temperature 30-32oC, during storage for added preservatives to prevent mold.
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