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CAS 1305-78-8

CAS 1305-78-8 matches 0 EU annex records across Annex II–VI of Regulation 1223/2009.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 1305-78-8
CAS 1305-78-8PubChem CID 14778

Calcium Oxide

Calcium oxide appears as an odorless, white or gray-white solid in the form of hard lumps. A strong irritant to skin, eyes and mucous membranes. Used in insecticides and fertilizers. — CAMEO Chemicals

IUPAC name
oxocalcium
Molecular formula
CaO
Molecular weight
56.08 g/mol
Exact mass
55.9575055 Da
Topological polar surface area
17.1 Ų
Hydrogen-bond donors
0
Hydrogen-bond acceptors
1
Covalent units
1
Defined stereocentres
0

Also known as

CalciaCalxylGebrannter kalkUnslaked limeCalcium monoxideAirlockCALXCalx usta
16 more reported names
Chaux viveQuick limeRhenosorb CRhenosorb FCalcium oxide (CaO)Desical PLime, burnedCaloxal CPACaloxol W3Vesta PPCaloxol CP2Calcia (CaO)Wapniowy tlenekBell CML(E)Bell CML(P)Oxyde de calcium
Open full PubChem recordPubChem annotations3D structure image
External database identifiers

Evidence from additional scientific databases

NIH PubChem PUG-View
Exact identifier match14778

Attributed physical-property, hazard, environmental and use annotations.

  • Autoignition Temperature: Not flammable (USCG, 1999) Source: CAMEO Chemicals
  • First Aid: Excerpt from NIOSH Pocket Guide for Calcium oxide:; Eye: IRRIGATE IMMEDIATELY - If this chemical contacts the eyes, immediately wash (irrigate) the eyes with large amounts of water, occasionally lifting the lower and upper lids. Get medical attention immediately.; Skin: WATER FLUSH IMMEDIATELY - If this chemical contacts the skin, immediately flush the contaminated skin with water. If this chemical penetrates the clothing, immediately remove the clothing and flush the skin with water. Get medical attention promptly.; Breathing: RESPIRATORY SUPPORT - If a person breathes large amounts of this chemical, move the exposed person to fresh air at once. If breathing has stopped, perform artificial respiration. Keep the affected person warm and at rest. Get medical attention as soon as possible.; Swallow: MEDICAL ATTENTION IMMEDIATELY - If this chemical has been swallowed, get medical attention immediately. (NIOSH, 2024) Source: CAMEO Chemicals
  • ERG2024, Guide 157 (Calcium oxide): General First Aid:; · Call 911 or emergency medical service.; · Ensure that medical personnel are aware of the material(s) involved, take precautions to protect themselves and avoid contamination.; · Move victim to fresh air if it can be done safely.; · Administer oxygen if breathing is difficult.; · If victim is not breathing:; -- DO NOT perform mouth-to-mouth resuscitation; the victim may have ingested or inhaled the substance.; -- If equipped and pulse detected, wash face and mouth, then give artificial respiration using a proper respiratory medical device (bag-valve mask, pocket mask equipped with a one-way valve or other device).; -- If no pulse detected or no respiratory medical device available, provide continuous compressions. Conduct a pulse check every two minutes or monitor for any signs of spontaneous respirations.; · Remove and isolate contaminated clothing and shoes.; · For minor skin contact, avoid spreading material on unaffected skin.; · In case of contact with substance, remove immediately by flushing skin or eyes with running water for at least 20 minutes.; · For severe burns, immediate medical attention is required.; · Effects of exposure (inhalation, ingestion, Source: Emergency Response Guidebook (ERG)
  • First Aid: (General first aid procedures); Eye: Irrigate immediately - If this chemical contacts the eyes, immediately wash (irrigate) the eyes with large amounts of water, occasionally lifting the lower and upper lids. Get medical attention immediately.; Skin: Water flush immediately - If this chemical contacts the skin, immediately flush the contaminated skin with water. If this chemical penetrates the clothing, immediately remove the clothing and flush the skin with water. Get medical attention promptly.; Breathing: Respiratory support; Swallow: Medical attention immediately - If this chemical has been swallowed, get medical attention immediately. Source: The National Institute for Occupational Safety and Health (NIOSH)
  • Note: This chemical does not meet GHS hazard criteria for 5.1% (130 of 2552) of reports. Source: European Chemicals Agency (ECHA)
  • Signal: Danger Source: European Chemicals Agency (ECHA)
  • GHS Hazard Statements: H302 (18.2%): Harmful if swallowed [Warning Acute toxicity, oral]; H314 (25.8%): Causes severe skin burns and eye damage [Danger Skin corrosion/irritation]; H315 (63.8%): Causes skin irritation [Warning Skin corrosion/irritation]; H318 (92.8%): Causes serious eye damage [Danger Serious eye damage/eye irritation]; H335 (63%): May cause respiratory irritation [Warning Specific target organ toxicity, single exposure; Respiratory tract irritation] Source: European Chemicals Agency (ECHA)
  • Precautionary Statement Codes: P260, P261, P264, P264+P265, P270, P271, P280, P301+P317, P301+P330+P331, P302+P352, P302+P361+P354, P304+P340, P305+P354+P338, P316, P317, P319, P321, P330, P332+P317, P362+P364, P363, P403+P233, P405, and P501 (click each P-code to see the statement) Source: European Chemicals Agency (ECHA)
  • ECHA C&L Notifications Summary: Aggregated GHS information provided per 2552 reports by companies from 66 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.; Reported as not meeting GHS hazard criteria per 130 of 2552 reports by companies.; There are 65 notifications provided by 2422 of 2552 reports by companies with hazard statement code(s).; Information may vary between notifications depending on impurities, additives, and other factors. The percentage value in parenthesis indicates the notified classification ratio from companies that provide hazard codes. Only hazard codes with percentage values above 10% are shown. For more detailed information, please visit ECHA C&L website. Source: European Chemicals Agency (ECHA)
  • GHS Hazard Statements: Not Classified; Reported as not meeting GHS hazard criteria by 1 of 1 companies. For more detailed information, please visit ECHA C&L website. Source: European Chemicals Agency (ECHA)
  • Signal: Danger Source: NITE-CMC
  • GHS Hazard Statements: H315: Causes skin irritation [Warning Skin corrosion/irritation]; H318: Causes serious eye damage [Danger Serious eye damage/eye irritation]; H370: Causes damage to organs [Danger Specific target organ toxicity, single exposure]; H372: Causes damage to organs through prolonged or repeated exposure [Danger Specific target organ toxicity, repeated exposure] Source: NITE-CMC
  • Precautionary Statement Codes: P260, P264, P264+P265, P270, P280, P302+P352, P305+P354+P338, P308+P316, P317, P319, P321, P332+P317, P362+P364, P405, and P501 (click each P-code to see the statement) Source: NITE-CMC
  • GHS Hazard Statements: H303: May be harmful if swallowed [Warning Acute toxicity, oral]; H304: May be fatal if swallowed and enters airways [Danger Aspiration hazard]; H314: Causes severe skin burns and eye damage [Danger Skin corrosion/irritation]; H318: Causes serious eye damage [Danger Serious eye damage/eye irritation]; H370: Causes damage to organs [Danger Specific target organ toxicity, single exposure]; H371: May cause damage to organs [Warning Specific target organ toxicity, single exposure]; H372: Causes damage to organs through prolonged or repeated exposure [Danger Specific target organ toxicity, repeated exposure] Source: NITE-CMC
  • Precautionary Statement Codes: P260, P264, P264+P265, P270, P280, P301+P316, P301+P317, P301+P330+P331, P302+P361+P354, P304+P340, P305+P354+P338, P308+P316, P316, P317, P319, P321, P331, P363, P405, and P501 (click each P-code to see the statement) Source: NITE-CMC
  • Signal: Danger Source: Hazardous Chemical Information System (HCIS), Safe Work Australia
  • Consumer Uses: Other; Binder; Abrasives; Processing aids not otherwise specified; Not Known or Reasonably Ascertainable; Filler; Catalyst; Soil amendments (fertilizers); Dehydrating agent (desiccant); Adsorbent; Intermediate Source: EPA Chemical Data Reporting (CDR)
  • Industry Uses: Other; Binder; Processing aids not otherwise specified; Antioxidant; pH regulating agent; Dust suppressant; Abrasives; Chemical reaction regulator; Dehydrating agent (desiccant); Absorbent; Flux agent; Soil amendments (fertilizers); Catalyst; Thickening agent; Waterproofing agent; Corrosion inhibitor; Filler; Not Known or Reasonably Ascertainable; Stabilizing agent; Sealant (barrier); Intermediate; Processing aids, specific to petroleum production; Adhesion/cohesion promoter; Drier; Solids separation (precipitating) agent, not otherwise specified; Chelating agent; Oxidizing agent; Adsorbent; Humectant Source: EPA Chemical Data Reporting (CDR)
  • Sources/Uses: Used in building materials (bricks, plaster, mortar, and stucco); to make aluminum, magnesium, calcium salts, and glass; to dehair hides; to process non-ferrous ores; to produce paper pulp; and to clarify cane and beet sugar juices; Also used in drilling fluids, lubricants, and water treatment; [HSDB] Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
  • Industrial Processes with risk of exposure: Aluminum Producing [Category: Industry]; Pulp and Paper Processing [Category: Industry]; Sewer and Wastewater Treatment [Category: Industry]; Leather Tanning and Processing [Category: Industry]; Cement Producing [Category: Industry]; Glass Manufacturing [Category: Industry]; Metal Extraction and Refining [Category: Industry] Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
  • Uses: For calcium oxide (USEPA/OPP Pesticide Code: 075604) ACTIVE products with label matches. /SRP: Registered for use in the USA but approved pesticide uses may change periodically and so federal, state and local authorities must be consulted for currently approved uses./ Source: Hazardous Substances Data Bank (HSDB)
  • Uses: In construction applications incl finishing & masons lime; in metallurgy, principally as a flux in steel prodn; kraft paper pulp prodn; ammonia recovery in solvay process for sodium carbonate; treatment of sewage and trade waste; water purification and softening; misc applications Source: Hazardous Substances Data Bank (HSDB)
  • Uses: In bricks, plaster, mortar, stucco, building materials; manufacture of steel, aluminum, magnesium, and flotation of non-ferrous ores; manufacture of glass, paper, Na2CO3 (Solvay process), calcium salts and many other industrial chemicals; dehairing hides; clarification of cane and beet sugar juices; in fungicides, insecticides, drilling fluids, lubricants; in water and sewage treatment; in laboratory to absorb carbon dioxide (the combination with NaOH is known as soda-lime ...) Source: Hazardous Substances Data Bank (HSDB)
  • Uses: In making chlorinated lime; dehydrating agent Source: Hazardous Substances Data Bank (HSDB)
  • Uses: For more Uses (Complete) data for CALCIUM OXIDE (6 total), please visit the HSDB record page. Source: Hazardous Substances Data Bank (HSDB)

Mapped by: Existing checksum-valid CAS to unique PubChem CID match. Retrieved: 2026-08-31. Open source record

Scientific classifications and hazard annotations provide context and do not replace the market-specific regulatory decision shown above.

Additional source coverage and match status
SourceResultChecked
NIH PubChem PUG-ViewExact match2026-08-31

A recorded no-match is useful evidence that the source was checked; it is not a claim that the substance does not exist elsewhere.

Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Records for CAS 1305-78-8

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How CAS 1305-78-8 is used on this site

CAS 1305-78-8 is the Chemical Abstracts Service identifier used to pin this page to a specific substance. In the current dataset, 0 EU annex records share this identifier, which helps you cross-check whether the same substance appears under one regulatory context or several.

Use this page when a supplier specification, SDS or raw-material dossier gives you CAS 1305-78-8 and you need to see every linked Annex II–VI record in one place. The entry cards above are the quickest route to concentration limits, warnings, annex placement and product-type conditions.