Calcium hydroxide
CAS 1305-62-0
EC 215-137-3
Formula CaH2O2
MW 74.09 g/mol
Alkalis & Bases Building & ConstructionWater TreatmentAgriculture & FeedFood & NutritionPulp & Paper pH Regulation & BufferingCoagulation & FlocculationPreservation & Biocide
Description
Calcium hydroxide (CAS 1305-62-0) is an inorganic alkali produced by hydrating quicklime, commonly known as slaked lime, hydralime, or Biocalc. It is registered under EC 215-137-3 and carries the molecular formula CaH2O2. No E-code applies to this substance.
In water treatment, calcium hydroxide raises pH to precipitate heavy metals and drives coagulation of suspended solids. In construction, it reacts with atmospheric CO2 to form calcium carbonate, providing the binding mechanism in lime mortars and plasters. It also serves as an antimicrobial agent in agricultural soil treatment by elevating pH to levels that suppress pathogen activity.
Calcium hydroxide is available in food-grade (FCC-compliant) and technical grades, supplied as a dry powder. It falls under REACH regulation and must be handled with a current Safety Data Sheet. Packaging typically includes 25 kg bags and bulk options; buyers should confirm grade suitability against Ph.Eur. requirements for pharmaceutical applications.
In water treatment, calcium hydroxide raises pH to precipitate heavy metals and drives coagulation of suspended solids. In construction, it reacts with atmospheric CO2 to form calcium carbonate, providing the binding mechanism in lime mortars and plasters. It also serves as an antimicrobial agent in agricultural soil treatment by elevating pH to levels that suppress pathogen activity.
Calcium hydroxide is available in food-grade (FCC-compliant) and technical grades, supplied as a dry powder. It falls under REACH regulation and must be handled with a current Safety Data Sheet. Packaging typically includes 25 kg bags and bulk options; buyers should confirm grade suitability against Ph.Eur. requirements for pharmaceutical applications.
Physical Properties
| Melting Point | 580 °C (decomp) |
| Boiling Point | 2850 °C |
| Density | 2.24 g/cm³ |
| Appearance | Calcium hydroxide is a soft white crystalline, odorless powder with an alkaline, bitter taste. |
| Color | White |
| Odor | Odorless |
| Form | Solid |
| Water Solubility | 1.65 g/L (20 ºC) |
| Refractive Index | 1.574 |
| pH | 12.6 (H2O, 20℃)(saturated solution) |
Safety & Handling (Learn More)
Danger GHS05 GHS07 GHS08
H
H314H315H318H335H370H373H402
P
P260P261P264P270P271P273P280P316P317P319P321P363P405P501P264+P265P302+P352P304+P340P308+P316P332+P317P362+P364P403+P233P301+P330+P331P302+P361+P354P305+P354+P338
Trade & Regulatory
| HS Code | 28259099 |
| Storage Class | 13 - Non Combustible Solids |
| WGK (Germany) | 1 |
Other Names
calcium dihydroxideCa(OH)2hydralimeslaked limeBiocalcCarboxideLime water
Related Products
Raw Materials
Derivatives
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