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CAS 1 record

CAS 1305-62-0

CAS 1305-62-0 matches 1 EU annex record across Annex II–VI of Regulation 1223/2009.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 1305-62-0
CAS 1305-62-0PubChem CID 6093208

Calcium Hydroxide

Calcium dihydroxide is a calcium hydroxide. It has a role as an astringent. — ChEBI

IUPAC name
calcium dihydroxide
Molecular formula
CaH2O2
Molecular weight
74.09 g/mol
Exact mass
73.9680702 Da
Topological polar surface area
2.0 Ų
Hydrogen-bond donors
2
Hydrogen-bond acceptors
2
Covalent units
3
Defined stereocentres
0

Also known as

Slaked limeHydrated limeLime hydrateCalcium hydrateLime waterCalcium hydroxide (Ca(OH)2)HydralimeSlaked-lime
16 more reported names
Lime milkCalcarea causticaINS NO.526PF5DZW74VNE-526CHEBI:31341Hydroxide, Calcium215-137-3O2 PatchRefChem:54625KO2, Ca(OH)2CHEBI:35150620-122-3Bell mineBiocalcCalbit
Open full PubChem recordPubChem annotations3D structure image
External database identifiers

Evidence from additional scientific databases

NIH PubChem PUG-View
Exact identifier match6093208

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 hydroxide:; 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: SOAP FLUSH IMMEDIATELY - If this chemical contacts the skin, immediately flush the contaminated skin with soap and water. If this chemical penetrates the clothing, immediately remove the clothing and flush the skin with water. If irritation persists after washing, get medical attention.; 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
  • 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: Soap flush immediately - If this chemical contacts the skin, immediately flush the contaminated skin with soap and water. If this chemical penetrates the clothing, immediately remove the clothing and flush the skin with water. If irritation persists after washing, get medical attention.; 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 0.4% (28 of 6644) of reports. Source: European Chemicals Agency (ECHA)
  • Signal: Danger Source: European Chemicals Agency (ECHA)
  • GHS Hazard Statements: H314 (22.4%): Causes severe skin burns and eye damage [Danger Skin corrosion/irritation]; H315 (45.3%): Causes skin irritation [Warning Skin corrosion/irritation]; H318 (76.9%): Causes serious eye damage [Danger Serious eye damage/eye irritation]; H335 (38.9%): 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, P271, P280, P301+P330+P331, P302+P352, P302+P361+P354, P304+P340, P305+P354+P338, P316, P317, P319, P321, 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 6644 reports by companies from 59 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.; Reported as not meeting GHS hazard criteria per 28 of 6644 reports by companies.; There are 56 notifications provided by 6616 of 6644 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] Source: NITE-CMC
  • Precautionary Statement Codes: P260, P264, P264+P265, P270, P280, P302+P352, P305+P354+P338, P308+P316, P317, P321, P332+P317, P362+P364, P405, and P501 (click each P-code to see the statement) 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]; H373: May causes damage to organs through prolonged or repeated exposure [Warning 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
  • Signal: Danger Source: Hazardous Chemical Information System (HCIS), Safe Work Australia
  • Cosmetic Ingredient Review Conclusion: The CIR Expert Panel concluded that ... Calcium Hydroxide is safe in hair straighteners and depilatories under conditions of recommended use; users should minimize skin contact. These ingredients are safe for all other present practices of use and concentration described in this safety assessment when formulated to be nonirritating. Source: Cosmetic Ingredient Review (CIR)
  • Cosmetic Ingredient Review Finding(s): Safe for use in cosmetics, with qualifications Source: Cosmetic Ingredient Review (CIR)
  • Environmental Fate: Aquatic Fate: Aquatic toxicity is the function of an alkalinity effect. Addition of lime to soft water lakes has increased biological activity, possibly by providing a carbon dioxide reservoir. Source: Hazardous Substances Data Bank (HSDB)
  • Environmental Fate: Calcium hydroxide does not degrade by photooxidation; it is neutralized by absorption of atmospheric carbon dioxide. Source: Hazardous Substances Data Bank (HSDB)
  • Consumer Uses: Chemical reaction regulator; pH regulating agent; Other; Lubricating agent; Adhesion/cohesion promoter; Flocculating agent; Heat stabilizer; Intermediate; Reducing agent; Soil amendments (fertilizers); Filler; Not Known or Reasonably Ascertainable; Absorbent Source: EPA Chemical Data Reporting (CDR)
  • Industry Uses: Other; Binder; Lubricating agent; Processing aids not otherwise specified; Chemical reaction regulator; Fuel agents; pH regulating agent; Fuel; Antioxidant; Flux agent; Absorbent; Dehydrating agent (desiccant); Sealant (barrier); Reducing agent; Stabilizing agent; Flow promoter; Catalyst; Filler; Diluent; Not Known or Reasonably Ascertainable; Corrosion inhibitor; Soil amendments (fertilizers); Solids separation (precipitating) agent, not otherwise specified; Hardener; Flocculating agent; Adhesion/cohesion promoter; Processing aids, specific to petroleum production; Intermediate; Softener and conditioner; Oxidizing agent; Adsorbent Source: EPA Chemical Data Reporting (CDR)
  • Cosmetic Ingredient Review Link: CIR ingredient: Calcium Hydroxide Source: Cosmetic Ingredient Review (CIR)
  • Sources/Uses: Used in mortar, plaster, cement, lubricants, drilling fluids, paper pulp, and water treatment; also used to dehair hides; [ACGIH] Used in pesticides, fireproofing coatings, water-based paints, SBR rubber vulcanization, binding and paving materials, soil treatments, brewing manufacture, dental cements, petrochemicals, as chemical intermediate, buffering agent for metals, pearls, and celluloid, disinfectant, food additive, for ammonia recovery in gas manufacture, purification of sugar juices, to preserve eggs and apples during storage, in cattle feeds, and veterinary medicine; [HSDB] Used as both an inert and active ingredient (microbiocide/microbiostat) in pesticide products; [EPA REDs] Used as a nutritional supplement, pH control agent, firming agent, and processing aid for foods; [FDA] Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
  • Industrial Processes with risk of exposure: Petroleum Production and Refining [Category: Industry]; Pulp and Paper Processing [Category: Industry]; Painting (Pigments, Binders, and Biocides) [Category: Paint]; Using Disinfectants or Biocides [Category: Clean]; Farming (Pesticides) [Category: Industry]; Sewer and Wastewater Treatment [Category: Industry]; Leather Tanning and Processing [Category: Industry]; Cement Producing [Category: Industry]; Farming (Feed Additives) [Category: Industry] Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
  • Uses: For calcium hydroxide (USEPA/OPP Pesticide Code: 075601) 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 mortar, plaster, cement and other binding and paving materials; in lubricants, drilling fluid, pesticides, fireproofing coatings, water paint; as egg preservative; manufacture of paper pulp; in SBR rubber vulcanization; in water treatment; as absorbant for carbon dioxide; dehairing hides. Source: Hazardous Substances Data Bank (HSDB)
  • Uses: Chem int in chlorohydrin process for propylene oxide /former use/; chem int for calcium hypochlorite, bleaching powder, and the fungicide, lime-sulfur spray; flux in iron and steel mfr; soil treatment for acidic soils; water softening agent; stabilization of soils for road base; component of sand-lime bricks and blocks; component of masonary mortar; water correcting agent in brewing mfr; component of dental cement; buffering agent for metals, pearls and celluloid. Source: Hazardous Substances Data Bank (HSDB)
  • Uses: Calcium salts, causticizing soda, depilatory, whitewash, soil conditioner, ammonia recovery in gas manufacturing, disinfectant, water softening, purification of sugar juices, petrochemicals, food additive as buffer and neutralizing agent, shell-forming agent (poultry) Source: Hazardous Substances Data Bank (HSDB)
  • Uses: For more Uses (Complete) data for CALCIUM HYDROXIDE (13 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 1305-62-0

1 total
Annex
III
Entry
15c

CALCIUM HYDROXIDE

Calcium hydroxide

(a) Contains alkali Avoid contact with eyes Keep out of reach of children Can cause blindness (b) Contains alkali Keep out of reach of children Avoid contact with eyes

EC
215-137-3
Max concentration

How CAS 1305-62-0 is used on this site

CAS 1305-62-0 is the Chemical Abstracts Service identifier used to pin this page to a specific substance. In the current dataset, 1 EU annex record shares 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 1305-62-0 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.

Frequently asked questions

A substance identified by CAS 1305-62-0 may appear in multiple EU cosmetic regulation annexes when it is subject to different conditions in different contexts. For example, a substance might be restricted under Annex III with specific conditions, and the same CAS might also appear in Annex IV as an approved colorant under separate entry conditions. Each entry must be reviewed individually.

Cross-reference the CAS number against your raw material specification sheets and CoA documents. When a CAS appears in Annex II, verify absence. When it appears in Annex III, verify that concentration limits and product type conditions are met in your formulation. All annex entries sharing this CAS number are listed above.

A CAS number is assigned by the Chemical Abstracts Service (USA) and is globally recognised. An EC number is a European Commission identifier from inventories such as EINECS, ELINCS or the NLP list. Both identifiers may appear in EU cosmetic annex entries. Some substances have both, some have only one, and some older entries may have neither.

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