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Calcium oxide

CAS No.: 1305-78-8
Formula: CaO
Molecular Weight: 56.08
Suppliers: All(0) China Suppliers(21) Products(164)
  • Description
  • Basic Info
  • Safety Info
  • MSDS
  • Price
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  • Supplier Reference
What is Calcium oxide

**Introduction to Calcium Oxide (CaO)** Calcium oxide, commonly known as quicklime or burnt lime, is a white, caustic, alkaline solid with the chemical formula CaO. It is produced by heating calcium carbonate (limestone) at high temperatures, releasing carbon dioxide in a process called calcination. Calcium oxide is highly reactive with water, generating heat and forming calcium hydroxide (slaked lime). Widely used in industries, it serves as a key material in steelmaking, cement production, water treatment, and soil stabilization. Additionally, it plays a role in chemical manufacturing, construction, and pollution control. Due to its strong alkalinity and exothermic properties, proper handling is essential to ensure safety. Calcium oxide remains a vital industrial compound with diverse applications.

Preparation Process: Calcium oxide (CaO) is prepared by the thermal decomposition of calcium carbonate (CaCO₃) in a process called calcination. Crushed limestone (CaCO₃) is heated in a kiln at 900–1000°C, releasing carbon dioxide (CO₂) and leaving behind calcium oxide. The reaction is: **CaCO₃(s) → CaO(s) + CO₂(g)** The kiln may be rotary or shaft-type, ensuring efficient heat transfer. The product is cooled and sieved to remove impurities. Quicklime (CaO) is obtained as a white, caustic solid. Proper ventilation is required to remove CO₂ gas. The purity depends on the quality of limestone and calcination conditions.

Usage Scenarios: Calcium oxide (CaO), commonly known as quicklime, is widely used in construction for cement and mortar production. It serves as a flux in steelmaking to remove impurities. In water treatment, it softens hard water and neutralizes acidic waste. The chemical industry employs it to produce calcium hydroxide, paper, and glass. Agriculture utilizes it as a soil conditioner to reduce acidity and improve fertility. It acts as a desiccant for drying gases and solvents. In waste treatment, it stabilizes sludge and disinfects waste. Additionally, CaO is used in sugar refining, leather tanning, and as a reagent in laboratories for various chemical reactions.

Calcium oxide Basic Info
Chemical Name Calcium oxide
Synonyms CaO;CAUSTIC;LIME;QUICKLIME;Calcium oxide powder;Calcination of calcium;CALX;cml21;cml31;calxyl
CAS No. 1305-78-8
Molecular Formula CaO
Molecular Weight 56.08
PSA 17.07000
LogP -0.11880
Safely Info
RTECS EW3100000
Hazard Class 8
Safety Statements 26-36/37/39-45-25-39
HS Code 28259019
WGK Germany 1
Packing Group III
RIDADR 1910
Risk Statements 34-41-37/38
Hazard Codes C,Xi
Caution Statement P280-P302+P352-P305+P351+P338+P310
Hazard Declaration H315-H318-H335
Symbol GHS05,GHS07
Signal Word Danger
Calcium oxide Price
Here is a rough price range for calcium oxide (CaO) in the listed countries. Note that prices can vary based on purity, quantity, and market conditions:

1. **United States**: $100–$300 per metric ton
2. **China**: $50–$150 per metric ton
3. **Russia**: $70–$200 per metric ton
4. **Germany**: $150–$350 per metric ton
5. **India**: $40–$120 per metric ton
6. **Japan**: $200–$400 per metric ton
7. **Brazil**: $80–$180 per metric ton
8. **South Korea**: $150–$300 per metric ton
9. **Philippines**: $60–$150 per metric ton
10. **United Kingdom**: $120–$300 per metric ton
11. **France**: $130–$320 per metric ton
12. **Mexico**: $70–$160 per metric ton
13. **Canada**: $100–$250 per metric ton
14. **South Africa**: $50–$140 per metric ton
15. **Egypt**: $60–$150 per metric ton
16. **Turkey**: $80–$180 per metric ton
17. **Thailand**: $50–$130 per metric ton
18. **Indonesia**: $40–$120 per metric ton

If no specific data is available for a country, it is marked as "No results." Prices are approximate and subject to change.
MSDS
SDS 1.0
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SAFETY DATA SHEETS

According to Globally Harmonized System of Classification and Labelling of Chemicals (GHS) - Sixth revised edition

Version: 1.0

Creation Date: Aug 12, 2017

Revision Date: Aug 12, 2017

1.Identification

1.1 GHS Product identifier

Product name calcium oxide

1.2 Other means of identification

Product number -
Other names Lime,Quicklime

1.3 Recommended use of the chemical and restrictions on use

Identified uses For industry use only. Food additives
Uses advised against no data available

1.4 Supplier's details

Company MOLBASE (Shanghai) Biotechnology Co., Ltd.
Address Floor 4 & 5, Building 12, No. 1001 North Qinzhou Road,
Xuhui District, Shanghai, China
Telephone +86(21)64956998
Fax +86(21)54365166

1.5 Emergency phone number

Emergency phone number +86-400-6021-666
Service hours Monday to Friday, 9am-5pm (Standard time zone: UTC/GMT +8 hours).

2.Hazard identification

2.1 Classification of the substance or mixture

Skin irritation, Category 2

Serious eye damage, Category 1

Specific target organ toxicity – single exposure, Category 3

2.2 GHS label elements, including precautionary statements

Pictogram(s)
Signal word

Danger

Hazard statement(s)

H315 Causes skin irritation

H318 Causes serious eye damage

H335 May cause respiratory irritation

Precautionary statement(s)
Prevention

P264 Wash ... thoroughly after handling.

P280 Wear protective gloves/protective clothing/eye protection/face protection.

P261 Avoid breathing dust/fume/gas/mist/vapours/spray.

P271 Use only outdoors or in a well-ventilated area.

Response

P302+P352 IF ON SKIN: Wash with plenty of water/...

P321 Specific treatment (see ... on this label).

P332+P313 If skin irritation occurs: Get medical advice/attention.

P362+P364 Take off contaminated clothing and wash it before reuse.

P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.

P310 Immediately call a POISON CENTER/doctor/…

P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing.

P312 Call a POISON CENTER/doctor/…if you feel unwell.

Storage

P403+P233 Store in a well-ventilated place. Keep container tightly closed.

P405 Store locked up.

Disposal

P501 Dispose of contents/container to ...

2.3 Other hazards which do not result in classification

none

3.Composition/information on ingredients

3.1 Substances

Chemical name Common names and synonyms CAS number EC number Concentration
calcium oxide calcium oxide 1305-78-8 none 100%

4.First-aid measures

4.1 Description of necessary first-aid measures

General advice

Consult a physician. Show this safety data sheet to the doctor in attendance.

If inhaled

Fresh air, rest. Refer for medical attention.

In case of skin contact

Remove contaminated clothes. Rinse skin with plenty of water or shower. Refer for medical attention .

In case of eye contact

First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention.

If swallowed

Rinse mouth. Do NOT induce vomiting. Give nothing to drink. Refer for medical attention .

4.2 Most important symptoms/effects, acute and delayed

Causes burns on mucous membrane and skin. Inhalation of dust causes sneezing. (USCG, 1999)

4.3 Indication of immediate medical attention and special treatment needed, if necessary

Immediate first aid: Remove patient from contact with the material. Ensure that adequate decontamination has been carried out. If patient is not breathing, start artificial respiration, preferably with a demand valve resuscitator, bag-valve-mask device, or pocket mask, as trained. Perform CPR if necessary. Immediately flush contaminated eyes with gently flowing water. Do not induce vomiting. If vomiting occurs, lean patient forward or place on the left side (head-down position, if possible) to maintain an open airway and prevent aspiration. Keep patient quiet and maintain normal body temperature. Obtain medical attention. /Inorganic Bases/Alkaline Corrosives and Related Compounds/

5.Fire-fighting measures

5.1 Extinguishing media

Suitable extinguishing media

Extinguish fire using agent suitable for surrounding fire. Use flooding quantities of water as spray. DO NOT use carbon dioxide or halogenated extinguishing agents.

5.2 Specific hazards arising from the chemical

Excerpt from ERG Guide 157 [Substances - Toxic and/or Corrosive (Non-Combustible / Water-Sensitive)]: Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. For UN1796, UN1826, UN2031 at high concentrations and for UN2032, these may act as oxidizers, also consult ERG Guide 140. Vapors may accumulate in confined areas (basement, tanks, hopper/tank cars, etc.). Substance may react with water (some violently), releasing corrosive and/or toxic gases and runoff. Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated or if contaminated with water. (ERG, 2016)

5.3 Special protective actions for fire-fighters

Wear self-contained breathing apparatus for firefighting if necessary.

6.Accidental release measures

6.1 Personal precautions, protective equipment and emergency procedures

Use personal protective equipment. Avoid dust formation. Avoid breathing vapours, mist or gas. Ensure adequate ventilation. Evacuate personnel to safe areas. Avoid breathing dust. For personal protection see section 8.

6.2 Environmental precautions

Personal protection: particulate filter respirator adapted to the airborne concentration of the substance. Sweep spilled substance into covered dry containers.

6.3 Methods and materials for containment and cleaning up

1) Ventilate area of spill. 2) Collect spilled material in most convenient and safe manner and deposit in sealed containers for reclamation or for disposal in secured sanitary landfill.

7.Handling and storage

7.1 Precautions for safe handling

Avoid contact with skin and eyes. Avoid formation of dust and aerosols. Avoid exposure - obtain special instructions before use.Provide appropriate exhaust ventilation at places where dust is formed. For precautions see section 2.2.

7.2 Conditions for safe storage, including any incompatibilities

Separated from strong acids, organic chemicals, water and food and feedstuffs. Dry.Keep tightly closed and dry.

8.Exposure controls/personal protection

8.1 Control parameters

Occupational Exposure limit values

Recommended Exposure Limit: 10 Hour Time-Weighted Average: 2 mg/cu m.

Biological limit values

no data available

8.2 Appropriate engineering controls

Handle in accordance with good industrial hygiene and safety practice. Wash hands before breaks and at the end of workday.

8.3 Individual protection measures, such as personal protective equipment (PPE)

Eye/face protection

Safety glasses with side-shields conforming to EN166. Use equipment for eye protection tested and approved under appropriate government standards such as NIOSH (US) or EN 166(EU).

Skin protection

Wear impervious clothing. The type of protective equipment must be selected according to the concentration and amount of the dangerous substance at the specific workplace. Handle with gloves. Gloves must be inspected prior to use. Use proper glove removal technique(without touching glove's outer surface) to avoid skin contact with this product. Dispose of contaminated gloves after use in accordance with applicable laws and good laboratory practices. Wash and dry hands. The selected protective gloves have to satisfy the specifications of EU Directive 89/686/EEC and the standard EN 374 derived from it.

Respiratory protection

Wear dust mask when handling large quantities.

Thermal hazards

no data available

9.Physical and chemical properties

Physical state white to grey solid
Colour Grey-white, cubic crystals
Odour Odorless
Melting point/ freezing point 2570ºC
Boiling point or initial boiling point and boiling range 2850°C(lit.)
Flammability Noncombustible Solid, but will support combustion by liberation of oxygen.Not combustible.
Lower and upper explosion limit / flammability limit no data available
Flash point 2850ºC
Auto-ignition temperature Not flammable (USCG, 1999)
Decomposition temperature no data available
pH SATURATED SOLN IN WATER IS ABOUT 12.8
Kinematic viscosity no data available
Solubility In water:REACTS
Partition coefficient n-octanol/water (log value) no data available
Vapour pressure 0 mm Hg (approx) (NIOSH, 2016)
Density and/or relative density 3.3g/mLat 25°C(lit.)
Relative vapour density no data available
Particle characteristics no data available

10.Stability and reactivity

10.1 Reactivity

no data available

10.2 Chemical stability

Readily absorbs carbon dioxide and water from air, becoming airslaked.

10.3 Possibility of hazardous reactions

Not combustible, but bulk powder may heat spontaneously when damp with water.A base and an oxidizing agent. Neutralizes acids with generation of heat. Nonflammable, but will support combustion by liberation of oxygen, especially in the presence of organic materials. Reacts very violently with liquid hydrofluoric acid [Mellor 2, Supp. 1:129 1956]. Reacts extremely violently with phosphorus pentaoxide when reaction is initiated by local heating [Mellor 8 Supp.3:406 1971].

10.4 Conditions to avoid

no data available

10.5 Incompatible materials

Addn of water to quicklime has generated temp as high as 800°C. Some reports describe reaction as violent. Ignition of sulfur, gunpowder, wood, and straw by heat of quicklime-water reaction has been reported.

10.6 Hazardous decomposition products

Decomposition product: calcium hydroxide.

11.Toxicological information

Acute toxicity

  • Oral: no data available
  • Inhalation: no data available
  • Dermal: no data available

Skin corrosion/irritation

no data available

Serious eye damage/irritation

no data available

Respiratory or skin sensitization

no data available

Germ cell mutagenicity

no data available

Carcinogenicity

no data available

Reproductive toxicity

no data available

STOT-single exposure

no data available

STOT-repeated exposure

no data available

Aspiration hazard

no data available

12.Ecological information

12.1 Toxicity

  • Toxicity to fish: no data available
  • Toxicity to daphnia and other aquatic invertebrates: no data available
  • Toxicity to algae: no data available
  • Toxicity to microorganisms: no data available

12.2 Persistence and degradability

no data available

12.3 Bioaccumulative potential

no data available

12.4 Mobility in soil

no data available

12.5 Other adverse effects

no data available

13.Disposal considerations

13.1 Disposal methods

Product

The material can be disposed of by removal to a licensed chemical destruction plant or by controlled incineration with flue gas scrubbing. Do not contaminate water, foodstuffs, feed or seed by storage or disposal. Do not discharge to sewer systems.

Contaminated packaging

Containers can be triply rinsed (or equivalent) and offered for recycling or reconditioning. Alternatively, the packaging can be punctured to make it unusable for other purposes and then be disposed of in a sanitary landfill. Controlled incineration with flue gas scrubbing is possible for combustible packaging materials.

14.Transport information

14.1 UN Number

ADR/RID: UN1910 IMDG: UN1910 IATA: UN1910

14.2 UN Proper Shipping Name

ADR/RID: CALCIUM OXIDE
IMDG: CALCIUM OXIDE
IATA: CALCIUM OXIDE

14.3 Transport hazard class(es)

ADR/RID: 8 IMDG: 8 IATA: 8

14.4 Packing group, if applicable

ADR/RID: III IMDG: III IATA: III

14.5 Environmental hazards

ADR/RID: no IMDG: no IATA: no

14.6 Special precautions for user

no data available

14.7 Transport in bulk according to Annex II of MARPOL 73/78 and the IBC Code

no data available

15.Regulatory information

15.1 Safety, health and environmental regulations specific for the product in question

Chemical name Common names and synonyms CAS number EC number
calcium oxide calcium oxide 1305-78-8 none
European Inventory of Existing Commercial Chemical Substances (EINECS) Listed.
EC Inventory Listed.
United States Toxic Substances Control Act (TSCA) Inventory Listed.
China Catalog of Hazardous chemicals 2015 Not Listed.
New Zealand Inventory of Chemicals (NZIoC) Listed.
Philippines Inventory of Chemicals and Chemical Substances (PICCS) Listed.
Vietnam National Chemical Inventory Listed.
Chinese Chemical Inventory of Existing Chemical Substances (China IECSC) Listed.

16.Other information

Information on revision

Creation Date Aug 12, 2017
Revision Date Aug 12, 2017

Abbreviations and acronyms

  • CAS: Chemical Abstracts Service
  • ADR: European Agreement concerning the International Carriage of Dangerous Goods by Road
  • RID: Regulation concerning the International Carriage of Dangerous Goods by Rail
  • IMDG: International Maritime Dangerous Goods
  • IATA: International Air Transportation Association
  • TWA: Time Weighted Average
  • STEL: Short term exposure limit
  • LC50: Lethal Concentration 50%
  • LD50: Lethal Dose 50%
  • EC50: Effective Concentration 50%

References

  • IPCS - The International Chemical Safety Cards (ICSC), website: http://www.ilo.org/dyn/icsc/showcard.home
  • HSDB - Hazardous Substances Data Bank, website: https://toxnet.nlm.nih.gov/newtoxnet/hsdb.htm
  • IARC - International Agency for Research on Cancer, website: http://www.iarc.fr/
  • eChemPortal - The Global Portal to Information on Chemical Substances by OECD, website: http://www.echemportal.org/echemportal/index?pageID=0&request_locale=en
  • CAMEO Chemicals, website: http://cameochemicals.noaa.gov/search/simple
  • ChemIDplus, website: http://chem.sis.nlm.nih.gov/chemidplus/chemidlite.jsp
  • ERG - Emergency Response Guidebook by U.S. Department of Transportation, website: http://www.phmsa.dot.gov/hazmat/library/erg
  • Germany GESTIS-database on hazard substance, website: http://www.dguv.de/ifa/gestis/gestis-stoffdatenbank/index-2.jsp
  • ECHA - European Chemicals Agency, website: https://echa.europa.eu/

Disclaimer: The above information is believed to be correct but does not purport to be all inclusive and shall be used only as a guide. The information in this document is based on the present state of our knowledge and is applicable to the product with regard to appropriate safety precautions. It does not represent any guarantee of the properties of the product. We as supplier shall not be held liable for any damage resulting from handling or from contact with the above product.
MSDS
Calcium oxide Suppliers
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China Jiangsu Suzhou
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United States
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China Shandong Qingdao
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China Jiangsu Suqian
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China Shandong Jinan
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