Molekula
Calcium hydroxide
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
Calcium hydroxide is a white, alkaline powder used in industrial processes, water treatment, and as a reagent in chemical synthesis. Its other major applications include mortar, plaster and cement, paper pulp manufacture, petroleum refining and pesticide formulations. It is highly corrosive and requires careful handling. Available in powder form with a molecular weight of 74.09 g/mol, CAS number 1305-62-0, and stored at ambient temperatures. Signal word: Danger. Molekula supplies Calcium hydroxide from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Often bought together
Pricing & pack sizes
These pack sizes aren't a limit. Molekula manufactures, sources and repacks to order — if you need 500 kg and only see 1 kg listed, . We quote from grams to multi-tonne.
Need a different size? Add the nearest pack and change the size in your basket — we price it at the same rate per unit.
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1 kg — £30.90 per pack ex VAT · £37.08 inc. VAT
Need a different quantity or pack?
Tell us how much you need and when — drums, IBCs, sacks or a one-off bulk lot. We'll manufacture or source it and come back with a price.
Prices exclude VAT/sales tax and shipping.
Specifications
| Property | Value |
|---|---|
| Appearance | Beige powder |
| pH | 12.4-12.6 |
| Chloride (Cl-) | ≤200 mg/kg |
| Assay | ≥96.0% |
| Impurities | ≤4% calcium carbonate (CaCO3) |
| Cadmium (Cd) | ≤50 mg/kg |
| Iron (Fe) | ≤500 mg/kg |
| Lead (Pb) | ≤50 mg/kg |
| Potassium (K) | ≤200 mg/kg |
| Sulphates (SO4)(2-) | ≤500 mg/kg |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | Ambient |
| Acidity | Base |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | Soft, hexagonal crystals |
| Odour | Odorless |
| Melting Point | 580 °C (decomposes) (loses water) |
| Density | 2.2 (relative, water = 1) |
| Water Solubility | 1.73 g/L at 20 °C |
| Solubility (other solvents) | Very slightly soluble in boiling water. Insoluble in alcohol |
| Vapour Pressure | 0 mmHg (approx) |
| Refractive Index | 1.574 |
Source: PubChem CID 6093208 (HSDB, ICSC, The National Institute for Occupational Safety and Health (NIOSH))
Identification
| Property | Value |
|---|---|
| SKU | 22800264 |
| CAS Number | 1305-62-0 |
| IUPAC Name | calcium dihydroxide |
| Molecular Formula | Ca(OH)2 |
| Molecular Weight | 74.09 |
| Exact Mass | 73.9681 |
| SMILES | [OH-].[OH-].[Ca+2] |
| InChIKey | AXCZMVOFGPJBDE-UHFFFAOYSA-L |
| InChI | InChI=1S/Ca.2H2O/h;2*1H2/q+2;;/p-2 |
| PubChem CID | 6093208 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 28259090 |
| Tariff Code | 2825901900 |
Safety & GHS
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Corrosive
GHS05
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Health Hazard
GHS07
Hazard statements
- H315 Causes skin irritation
- H318 Causes serious eye damage
- H335 May cause respiratory irritation
Precautionary statements
- P261 Avoid breathing dust/fume/gas/mist/vapours/spray
- P264 Wash thoroughly after handling
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P302+352 IF ON SKIN: Wash with soap and water
- P304+340 IF INHALED: Remove victim to fresh air and keep at rest in a position comfortable for breathing
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- Calcarea caustica
- Calcium hydrate
- Calcium hydroxide (Ca(OH)2)
- Hydralime
- Hydrated lime
- INS NO.526
- Lime hydrate
- Lime milk
- Lime water
- Slaked lime
Frequently asked questions
What is calcium hydroxide used for?
Calcium hydroxide is commonly used in water treatment, soil stabilization, and as a reagent in chemical synthesis.
What is the chemical formula and molecular weight of calcium hydroxide?
The formula is Ca(OH)2 and the molecular weight is 74.09 g/mol.
How should calcium hydroxide be stored?
It should be stored at ambient temperature in a dry, well-ventilated area.
What grade of calcium hydroxide does Molekula supply?
Molekula supplies calcium hydroxide in reagent grade.
Can Molekula supply calcium hydroxide in bulk?
Yes, Molekula can supply calcium hydroxide in bulk quantities upon request.
What documentation comes with a calcium hydroxide order?
Each order includes a Certificate of Analysis and Safety Data Sheet (SDS).
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.