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About Dustless Chalk and Process of Making PDF
The document describes a novel process for creating dustless chalk. The chalk is made from a composition of 20-60% calcium sulfate dihydrate and 30-70% calcium sulfate hemihydrate, mixed with a polyhydro compound. The mixture is treated with an air-removing agent to maintain uniformity and strength while being molded into cylindrical shapes. The process involves partially dehydrating gypsum to form calcium sulfate hemihydrate, mixing it with calcium sulfate dihydrate and a polyhydro compound, adding an air-removing agent, molding the mixture, drying the molded chalk pieces, and packaging the finished dustless chalk.
Detailed Information
| Author: | ['A.Sivalingam'] |
|---|---|
| Publication Year: | 2019 |
| Pages: | 4 |
| Language: | English |
| Format: | |
| Price: | FREE |
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