Specialty Additives Available — Bulk Only

Calcium Oxide (Quicklime)

CaO / Quicklime
CAS 1305-78-8 · Formula CaO · MW 56.08 g/mol

The high-tonnage lime feedstock underpinning metallurgy, construction, and water treatment. It is used in steelmaking as a flux, in construction materials, in non-ferrous ore flotation, in paper-pulp and glass manufacture, in water and sewage treatment, and as a dehydrating agent.

Safety Data Sheet
UN Number
UN 1910
Hazard Class
Class 8
HS Code
2522.10
At a Glance
Material Family
Specialty Additives
Record Type
Pure compound
Primary Role
pH Adjustment · Moisture Control
Functional Roles
pH Adjustment Moisture Control Synthesis Intermediate
INCI Name
CALCIUM OXIDE
CosIng Functions
BUFFERING
Industries Served
Beauty & Personal Care Industrial Manufacturing Oil & Gas Water Treatment
Applications & Use Cases
  • ▸ Metallurgical flux: Flux in steel production and ore processing.
  • ▸ Construction: Component of building materials, mortar, and stucco.
  • ▸ Water/sewage: Treatment of water and trade wastes.
  • ▸ Pulp & glass: Used in paper-pulp and glass manufacture.
  • ▸ Dehydrating agent: Desiccant and drying applications.
Physical Properties
Melting Point
2572 °C
Boiling Point
2850 °C at 760 mmHg
Density
3.3 at 20 °C
Solubility
Reacts with water
Vapor Pressure
0 mmHg (approx)
Flash Point
Not flammable
pH
SATURATED SOLN IN WATER IS ABOUT 12.8
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.

DOT / UN Transport Classification
DOT hazard class 8 placard
UN / DOT NumberUN 1910
Hazard Class / DivisionClass 8
Packing GroupIII
Proper Shipping NameCalcium oxide

Transport classification per the UN Model Regulations / 49 CFR 172.101 Hazardous Materials Table. Confirm against the grade-specific SDS (Section 14) before shipping.

HS / Tariff Classification
Harmonized System (HS) Code — 6-digit international heading
2522 . 10
Chapter 25
Salt; sulphur; earths and stone; lime and cement
Heading 25.22
Internationally harmonized (WCO HS)
Subheading 2522.10
6-digit international code — national tariff line adds further digits
Chemical Identity
CAS Number
1305-78-8
Molecular Formula
CaO
Molecular Weight
56.08 g/mol
IUPAC Name
oxocalcium
INCI Name
CALCIUM OXIDE
PubChem CID
14778
InChI Key
ODINCKMPIJJUCX-UHFFFAOYSA-N
Synonyms & Trade Names
Calcia Calxyl Gebrannter kalk Unslaked lime Calcium monoxide Airlock CALX Calx usta Chaux vive Quick lime Rhenosorb C Rhenosorb F Desical P Lime, burned Caloxal CPA Caloxol W3 Vesta PP Caloxol CP2 Calcia (CaO) Wapniowy tlenek
Full Description

Calcium Oxide (CAS 1305-78-8), commonly called quicklime, is produced by calcining limestone. It is used in steelmaking as a flux, in construction materials, in non-ferrous ore flotation, in paper-pulp and glass manufacture, in water and sewage treatment, and as a dehydrating agent.

Frequently Asked Questions

What is calcium oxide used for?

Calcium oxide (quicklime, CaO) is used as a metallurgical flux in steelmaking and ore flotation, in construction materials such as mortar and stucco, in water and sewage treatment, in paper-pulp and glass manufacture, and as a dehydrating/desiccant agent. RawSource supplies it in bulk to industrial manufacturers.

What is the common name for calcium oxide?

Calcium oxide is commonly called quicklime, or simply lime. It is produced by calcining limestone (calcium carbonate). CAS 1305-78-8, formula CaO.

Does calcium oxide react with water?

Yes. Calcium oxide reacts exothermically with water to form calcium hydroxide (slaked lime), releasing heat. Consult the SDS for handling, storage, and personal-protective-equipment requirements before use.

How does calcium oxide ship under DOT?

Calcium oxide is assigned UN1910 for transport. RawSource provides the SDS and applicable classification documentation with each shipment; confirm packaging and labeling requirements for your mode of transport at time of order.

What is the cost of bulk calcium oxide?

Bulk pricing depends on grade, packaging (bags, supersacks, bulk), and volume. RawSource quotes industrial quantities to manufacturers; request a bulk quote with your target volume and packaging for current pricing.

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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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