Difference between revisions of "Calcium chloride"
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== Description == | == Description == | ||
| − | The anhydrous form of calcium chloride is very [[hygroscopic]] | + | The anhydrous form of calcium chloride is very [[hygroscopic]] and is used as a desiccant. Calcium chloride also exists as dihydrate and hexahydrate crystals; these crystalline forms are used in antifreeze solutions, fire extinguishers, fireproofing solutions, wood preservatives, as a gelling agent for [[starch]] size and to [[ice melter|melt snow and ice]] from roads. Calcium chloride was used to speed up the rate of cure in [[mortar%20%28masonry%29|Mmortar]], [[shotcrete]], and dry-mix [[concrete]] until 1973 when it was replaced by a non-chloride accelerator because it corroded [[steel]] reinforcements. |
== Risks == | == Risks == | ||
| − | * Contact may cause irritation | + | * Contact may cause irritation |
| + | * Absorption of water is exothermic | ||
* LabChem: [https://www.labchem.com/tools/msds/msds/75446.pdf MSDS] | * LabChem: [https://www.labchem.com/tools/msds/msds/75446.pdf MSDS] | ||
Revision as of 13:51, 12 July 2023
Description
The anhydrous form of calcium chloride is very Hygroscopic and is used as a desiccant. Calcium chloride also exists as dihydrate and hexahydrate crystals; these crystalline forms are used in antifreeze solutions, fire extinguishers, fireproofing solutions, wood preservatives, as a gelling agent for Starch size and to melt snow and ice from roads. Calcium chloride was used to speed up the rate of cure in Mmortar, Shotcrete, and dry-mix Concrete until 1973 when it was replaced by a non-chloride accelerator because it corroded Steel reinforcements.
Risks
- Contact may cause irritation
- Absorption of water is exothermic
- LabChem: MSDS
Physical and Chemical Properties
Soluble in water (with the evolution of heat). pH = 8 - 9
| Composition | CaCl2 |
|---|---|
| CAS | 10043-52-4 |
| Melting Point | 772 C |
| Density | 2.152 g/ml |
| Molecular Weight | mol. wt. = 110.98 |
| Boiling Point | >1600 C |
Resources and Citations
- G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 140
- Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
- Michael McCann, Artist Beware, Watson-Guptill Publications, New York City, 1979
- Book and Paper Group, Paper Conservation Catalog, AIC, 1984, 1989
- Thomas C. Jester (ed.), Twentieth-Century Building Materials, McGraw-Hill Companies, Washington DC, 1995
- Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
- The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 1630