Calcium hydroxide CAS#1305-62-0
Appearance: Calcium Hydroxide is a colorless crystal or white powder, typically obtained by mixing lime (CaO) with water, or through precipitation from CaCl2 and NaOH.
Natural Form: The natural mineral form of Calcium Hydroxide is known as "portlandite," a relatively rare mineral found in volcanic, plutonic, and metamorphic rocks.
Formation: It can also form in burning coal dumps, further showcasing its versatility and presence in various environments.
Chemical Composition: Calcium Hydroxide is produced when quicklime (CaO) is slaked with water, a process that makes it widely used in various industrial applications.
Calcium Hydroxide (CAS# 1305-62-0)
Calcium Hydroxide is a colorless crystal or white powder, typically produced by mixing calcium oxide (lime or quicklime) with water, a process known as "slaking." It can also be precipitated by reacting calcium chloride (CaCl2) with sodium hydroxide (NaOH). The natural mineral form of Calcium Hydroxide is called "portlandite," a relatively rare mineral found in volcanic, plutonic, and metamorphic rocks. Additionally, it is known to form in burning coal dumps.
Calcium hydroxide Chemical Properties
| Hazard Codes | Xi |
| Risk Statements | 36/37/38 |
| Safety Statements | 26-36 |
| WGK Germany | 3 |
| HS Code | 2835390000 |
| Hazardous Substances Data | 10058-44-3(Hazardous Substances Data |
Safety Information
| Hazard Codes | Xi,C |
| Risk Statements | 41-34-37/38 |
| Safety Statements | 26-39-45-36/37/39-27 |
| OEB | B |
| OEL | TWA: 5 mg/m3 |
| WGK Germany | 1 |
| RTECS | EW2800000 |
| F | 34 |
| TSCA | Yes |
| HS Code | 2825 90 19 |
| Hazardous Substances Data | 1305-62-0(Hazardous Substances Data) |
| Toxicity | LD50 orally in rats: 7.34 g/kg (Smyth) |
Product Application of Calcium Hydroxide (CAS# 1305-62-0)
Food Industry:
According to GB 2760-96, Calcium Hydroxide is used as a processing aid under GMP standards. As per FAO/WHO (1984), it is used in butter and whey cream (2g/kg) for pH adjustment (calculated on anhydrous substance), grape juice and its concentrated juices (physical method for anticorrosion), baby food, and edible caseinates under GMP guidelines.Japan Regulations:
In Japan, the maximum allowed amount is 1.84% (1% calcium content).Industrial Applications:
Calcium Hydroxide is used in the preparation of bleaching powders, hard water softeners, and disinfecting or clarifying agents for tap water, as well as in the building industry.Pharmaceutical and Chemical Industry:
It is used in pharmacy and as an additive in the rubber and oil industry. It functions as a lubricant additive to prevent coking, sludge deposition, and corrosion. Additionally, it serves as an antacid, disinfectant, and hard water softener.Other Applications:
It is utilized as an analytical reagent, carbon dioxide absorbent, and in organic synthesis. It also plays a role in making various calcium salts, depilatories, acid stop agents, astringents, and bleaching powders. Furthermore, it is used for carbon dioxide examination, leather hair removal, insecticides, and water treatment.
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