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Specialty Additives Available — Bulk Only

Calcium Hydroxide (Slaked Lime, Hydrated Lime)

Ca(OH)2
CAS 1305-62-0 · Formula CaH2O2 · MW 74.09 g/mol

A workhorse alkali for construction, water treatment, and pH control across industrial process streams. It is used in mortar, plaster, and cement; in water and wastewater treatment; in paper-pulp production; in leather dehairing; and as a pH-adjusting and buffering agent, including food-additive use as a neutralizing agent.

Part of Specialty Additives · pH Adjustment Chemicals · Animal Agriculture Sanitation Chemicals
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HS Code
2825.90
At a Glance
Material Family
Specialty Additives
Record Type
Pure compound
Primary Role
pH Adjustment · Synthesis Intermediate
Solubility
0.2 % at 0 °C
Functional Roles
pH Adjustment Synthesis Intermediate
INCI Name
CALCIUM HYDROXIDE
CosIng Functions
BUFFERING
Industries Served
Agriculture Beauty & Personal Care Food & Beverage HI&I Cleaning Industrial Manufacturing Oil & Gas Textiles Water Treatment
Applications & Use Cases
  • ▸ Construction: Binder in mortar, plaster, and cement.
  • ▸ Water treatment: Softening and pH adjustment in water and wastewater.
  • ▸ Pulp & paper: Causticizing and pulp processing.
  • ▸ Leather: Dehairing of hides.
  • ▸ pH/buffer: Neutralizing and buffering agent, including food-additive use.
Physical Properties
Melting Point
580 °C (Decomposes) (Loses H2O)
Boiling Point
Decomposes
Density
2.24 at 20 °C
Solubility
0.2 % at 0 °C
Vapor Pressure
0 mmHg (approx)
Flash Point
/Calcium Hydroxide is/ non flammable
pH
pH = 12.4 (aqueous solution saturated at 25 °C)
Safety & Handling
Full SDS available on request

A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.

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HS / Tariff Classification
Harmonized System (HS) Code — 6-digit international heading
2825 . 90
Chapter 28
Inorganic chemicals; compounds of precious metals and rare-earth metals
Heading 28.25
Internationally harmonized (WCO HS)
Subheading 2825.90
6-digit international code — national tariff line adds further digits
Chemical Identity
CAS Number
1305-62-0
Molecular Formula
CaH2O2
Molecular Weight
74.09 g/mol
IUPAC Name
calcium dihydroxide
INCI Name
CALCIUM HYDROXIDE
PubChem CID
6093208
InChI Key
AXCZMVOFGPJBDE-UHFFFAOYSA-L
Synonyms & Trade Names
CALCIUM HYDROXIDE Slaked lime Hydrated lime Lime hydrate Calcium hydrate Lime water Calcium hydroxide (Ca(OH)2) Hydralime Slaked-lime Lime milk Calcarea caustica INS NO.526 E-526 Hydroxide, Calcium O2 Patch
Full Description

Calcium Hydroxide (CAS 1305-62-0) is an inorganic base. It is used in mortar, plaster, and cement; in water and wastewater treatment; in paper-pulp production; in leather dehairing; and as a pH-adjusting and buffering agent, including food-additive use as a neutralizing agent.

Frequently Asked Questions

What is calcium hydroxide used for?

Calcium hydroxide (CAS 1305-62-0, Ca(OH)2) is an inorganic base used in mortar, plaster, and cement; in water and wastewater treatment; in paper-pulp production; in leather dehairing; and as a pH-adjusting and buffering agent, including food-additive use as a neutralizing agent.

What is the difference between calcium hydroxide USP/FCC and a technical grade?

All are Ca(OH)2, but the USP/FCC powder grade is tested to United States Pharmacopeia and Food Chemicals Codex specifications for assay and impurity limits, giving documented food/pharmaceutical-grade compliance versus a general industrial grade. The chemistry is the same; the controls and documentation differ.

What is the common name for calcium hydroxide?

Calcium hydroxide is commonly called slaked lime or hydrated lime. It is the inorganic base Ca(OH)2 (CAS 1305-62-0).

Does RawSource supply USP/FCC calcium hydroxide powder in bulk?

Yes. RawSource distributes USP/FCC calcium hydroxide powder in bulk bags and supersacks to manufacturers and treatment operators. Send your target volume for a quote.

Can RawSource provide a CoA and SDS for calcium hydroxide?

Yes. A Certificate of Analysis and Safety Data Sheet are provided with shipments. Request current USP/FCC documentation against CAS 1305-62-0 with your RFQ.

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Disclaimer. Information on this page — including properties, identifiers, hazard, transport (DOT/UN) and tariff (HS) classifications, and applications — is provided for general reference and is compiled from authoritative public sources (e.g. PubChem/ECHA, 49 CFR 172.101, the Harmonized Tariff Schedule). Values are typical and are not a guaranteed specification; the Certificate of Analysis (CoA) for the lot purchased governs. Products are sold for industrial and professional use only. Nothing here is a medical, health, or efficacy claim or advice. Always consult the current Safety Data Sheet (SDS) before handling, storage, transport or disposal, and confirm regulatory status, classification and suitability for your application and jurisdiction. Hazard, transport and tariff classifications must be verified for your specific shipment. RawSource makes no warranty, express or implied, and assumes no liability for use of this information. Trademarks. Third-party trademarks and brand names are the property of their respective owners; any reference is nominative — used only to identify a comparable product — and does not imply affiliation with, sponsorship by, or endorsement by the trademark owner.
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