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Position：Home > Technical Support > Food and Pharm. grade > Method to Distinguish Between Calcium Sulfate(Gypsum)——Calcium Sulfate Water-washing SOP
PURPOSE
Efficiently, quickly and easily distinguish between sensory differences on calcium sulfate(gypsum) products.
SCOPE
Apply to all calcium sulfate(gypsum) products.
SOP
(test whiteness, smell, impurity, fineness)
1 Take 10g calcium sulfate, pour it on a piece of A4 paper, judge the whiteness from the appearance;
2 Add 100ml water in a clean 300ml beaker. Pour 10g calcium sulfate in the beaker, rotation the beaker 10 seconds cover with aluminum foil paper (note: the powder in water);
3 Remove the cover and smell the mixture, looking for characteristic smell or bad smell (such as rotten eggs smell, musty, oil, chalk, hot metal);
4 Stir the mixture clockwise evenly with a glass rod, while observation solution surface and the bottom of the beaker is whether exists presence of impurities and foreign body; uniform mixing for 10 seconds clockwise and then immediately stop; observe the layering of the mixture.
CONCLUSION
1Whiteness: the whiteness is higher, the corresponding content is higher. If you want the content is 98%, whiteness must to be 95! The whiteness of qualified product is whiter than A4 printing paper.
2 Smell: the good quality of calcium sulfate solution is no peculiar smell, but the poor quality solution will be like a rotten egg smell, musty, oil, chalk, the peculiar smell of the hot metal.
3 Impurity: the bottom impurity of calcium sulfate solution is less, the content is greater.
4 Fineness: the layered of calcium sulfate solution is slower, the fineness is more fine-grained.
To be the best calcium sulfate supplier of the world!
—— LeiXin Gypsum
