Provenance

Reference data from EU CLP Annex VI and published regulations — verify against your supplier's SDS before use.

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Substance profile

2,3-epoxypropan-1-ol

2,3-epoxypropan-1-ol is colorless, slightly viscous liquid.

CAS 556-52-5 C3H6O2 74.08 g/mol Danger

01 · Identification

What 2,3-epoxypropan-1-ol is

2,3-epoxypropan-1-ol is colorless, slightly viscous liquid. Its molecular formula is C3H6O2 and its molecular weight is 74.08 g/mol. It boils at 160 °C, melts at -45 °C, is soluble in water.

Under the GHS it carries the signal word Danger. It is classed as carcinogens.

02 · Identifiers

2,3-epoxypropan-1-ol identifiers and molecular data

2,3-epoxypropan-1-ol CAS number and EC number

CAS number556-52-5
EC number209-128-3
Index number (CLP Annex VI)603-063-00-8

2,3-epoxypropan-1-ol molecular formula and molecular weight

Molecular formulaC3H6O2
Molecular weight74.08 g/mol
Chemical class Carcinogens

Other names for 2,3-epoxypropan-1-ol

  • glycidol
  • oxiranemethanol

03 · GHS classification

2,3-epoxypropan-1-ol hazard classification

Harmonised classification under CLP Annex VI. This is the legally binding classification in the EU; other jurisdictions may differ.

2,3-epoxypropan-1-ol pictograms and signal word

Signal wordDanger

2,3-epoxypropan-1-ol hazard class and category

GHS hazard classes 2,3-epoxypropan-1-ol falls into
Hazard class Category From code Pictogram
Acute toxicity - oral GHS chapter 3.1 Category 4 H302 GHS07
Acute toxicity - dermal GHS chapter 3.1 Category 4 H312 GHS07
Acute toxicity - inhalation GHS chapter 3.1 Category 3 H331 GHS06
Skin corrosion/irritation GHS chapter 3.2 Category 2 H315 GHS07
Serious eye damage/eye irritation GHS chapter 3.3 Category 2A H319 GHS07
Germ cell mutagenicity GHS chapter 3.5 Category 2 H341 GHS08
Carcinogenicity GHS chapter 3.6 Category 1A or 1B H350 GHS08
Specific target organ toxicity - single exposure GHS chapter 3.8 Category 3 H335 GHS07

Where two values are shown with “or”, the hazard statement is shared by more than one category or by more than one class, and the code alone does not say which. H272, for example, belongs to oxidising liquids and to oxidising solids — the physical state decides. The binding answer for a specific entry is in the CLP Annex VI table itself.

2,3-epoxypropan-1-ol hazard statements (H-codes)

Hazard statements assigned to 2,3-epoxypropan-1-ol
CodeHazard statement
H350 May cause cancer <state route of exposure if it is conclusively proven that no other routes of exposure cause the hazard>.
H341 Suspected of causing genetic defects <state route of exposure if it is conclusively proven that no other routes of exposure cause the hazard>.
H360F May damage fertility.
H331 Toxic if inhaled.
H312 Harmful in contact with skin.
H302 Harmful if swallowed.
H335 May cause respiratory irritation.
H315 Causes skin irritation.
H319 Causes serious eye irritation.

This page lists only the codes assigned to 2,3-epoxypropan-1-ol. The full reference lives on the hazard statements hub, the precautionary statements hub and the GHS pictograms hub.

Safety Data Sheet

Getting an SDS for 2,3-epoxypropan-1-ol

A Safety Data Sheet is written for a product, not for a substance: the supplier of the grade you actually buy issues it, so two suppliers of 2,3-epoxypropan-1-ol issue two different sheets. That is why there is no single authoritative SDS for a substance to download — what there is, is the job of collecting the sheets for the products you hold and keeping them current as suppliers revise them.

04 · Precautionary statements

2,3-epoxypropan-1-ol precautionary statements

CLP Annex VI assigns 19 precautionary statements to 2,3-epoxypropan-1-ol. They are grouped the way a label groups them: what to do before handling, what to do when something has already happened, how to store it and how to dispose of it.

Reading the notation. is a blank the supplier fills in — not a truncated sentence.· [square brackets] mark a part printed only when it applies.

05 · Names in the regulation

2,3-epoxypropan-1-ol name in 23 EU languages

CLP Annex VI Part 3 is published in every language edition of the regulation, and the identification column is written out in each of them. Nothing below is translated by us: each line is the name as that edition prints it. Under Art. 18(2) the substance name from Annex VI is a lawful product identifier, so this is the wording to put on a label going to that market — and where the cell lists several designations, any one of them qualifies.

Language Name in CLP Annex VI Part 3
Bulgarian български 2,3-епоксипропан-1-ол глицидолоксиранметанол
Spanish español 2,3-Epoxipropan-1-ol glicidoloxiranometanol
Czech čeština 2,3-epoxypropan-1-ol glycidoloxiranylmethanol
Danish dansk 2,3-epoxypropan-1-ol glycidol: oxiranmethanol
German Deutsch 2,3-Epoxypropan-1-ol GlycidolOxiranmethanol
Estonian eesti 2,3-epoksüpropaan-1-ool glütsidooloksiraanmetanool
Greek ελληνικά 2,3-εποξυπροπαν-2-όλη γλυκιδόληοξιρανομεθανόλη
English English 2,3-epoxypropan-1-ol glycidoloxiranemethanol
French français 2,3-époxypropan-1-ol glycidoloxiraneméthanol
Croatian hrvatski 2,3-epoksipropan-1-ol glicidoloksiranmetanol
Italian italiano 2,3-epossipropan-1-olo glicidoloossiranemetanolo
Latvian latviešu 2,3-epoksipropān-1-ols glicidolsoksirānmetanols
Lithuanian lietuvių 2,3-epoksi-1-propanolis glicidolisoksiranmetanolis
Hungarian magyar 2,3-epoxipropán-1-ol glicidoloxiránmetanol
Maltese Malti 2,3-epossipropan-1-ol gliċidolossiranemetanol
Dutch Nederlands 2,3-epoxypropaan-1-ol glycidoloxiraanmethanol
Polish polski 2,3-epoksypropan-1-ol alkohol glicydowyoksiranylometanolglicydol
Portuguese português 2,3-epoxipropan-1-ol glicidoloxiranometanol
Romanian română 2,3-epoxipropan-1-ol glicidoloxiranemetanol
Slovak slovenčina 2,3-epoxypropán-1-ol glycidoloxiránmetanol
Slovenian slovenščina 2,3-epoksipropan-1-ol glicidoloksiranmetanol
Finnish suomi 2,3-epoksipropan-1-oli glysidolioksiraanimetanoli
Swedish svenska 2,3-epoxipropan-1-ol glycidoloxiranmetanol

All 23 language editions of Annex VI carry this entry. Irish is the twenty-fourth official EU language and has no line here for a different reason: no consolidated CLP text has ever been published in Irish, so there is no Irish edition of Annex VI to quote a name from. Source: consolidated CLP, CELEX 02008R1272, language editions. © European Union, https://eur-lex.europa.eu — only the electronic Official Journal of the European Union is authentic.

06 · Label elements

2,3-epoxypropan-1-ol GHS label elements

Everything CLP Annex VI fixes for 2,3-epoxypropan-1-ol, laid out the way it appears on a label. The greyed lines are the parts only the supplier can fill in.

GHS06 Skull and crossbones pictogramGHS08 Health hazard pictogram

Danger

2,3-epoxypropan-1-ol

  • May cause cancer <state route of exposure if it is conclusively proven that no other routes of exposure cause the hazard>.
  • Suspected of causing genetic defects <state route of exposure if it is conclusively proven that no other routes of exposure cause the hazard>.
  • May damage fertility.
  • Toxic if inhaled.
  • Harmful in contact with skin.
  • Harmful if swallowed.
  • May cause respiratory irritation.
  • Causes skin irritation.
  • Causes serious eye irritation.
  • Obtain special instructions before use.
  • Do not breathe dust/fume/gas/mist/vapours/spray.
  • Wash thoroughly after handling.
  • Do not eat, drink or smoke when using this product.
  • Use only outdoors or in a well-ventilated area.
  • Wear protective gloves/protective clothing/eye protection/face protection/hearing protection/
  • IF SWALLOWED:
  • IF ON SKIN:
  • IF INHALED:
  • IF IN EYES:
  • IF exposed or concerned:
  • Immediately call a POISON CENTER/doctor/
  • Call a POISON CENTER/doctor/ if you feel unwell.
  • Get medical advice/attention.
  • Rinse mouth.
  • If skin irritation occurs:
  • If eye irritation persists:
  • Remove contact lenses, if present and easy to do. Continue rinsing.
  • Wash with plenty of water/

Supplier name, address and telephone number· Product identifier·Nominal quantity

Need this as an actual label? Open 2,3-epoxypropan-1-ol in the GHS label constructor →

07 · Health hazards

2,3-epoxypropan-1-ol health hazards and exposure limits

2,3-epoxypropan-1-ol hazard summary

Mice and rats exposed to high concentrations develop pneumonitis and emphysema; Rabbits show skin irritation and reversible corneal burns after skin and eye exposure; [ACGIH] In lethal inhalation studies of rodents, pulmonary edema was usually the cause of death; There is no experimental data, but glycidol, an epoxide, should be considered a potential skin and respiratory sensitizer; [HSDB]

Source: Haz-Map, Information on Hazardous Chemicals and Occupational Diseases

2,3-epoxypropan-1-ol carcinogenicity classification

IARC classification Group 2A — Probably carcinogenic to humans
IARC monographs Volume 77: (2000) Some Industrial Chemicals

Under the conditions of these 2-year gavage studies, there was clear evidence of carcinogenic activity of glycidol for male F344/N rats, based on increased incidences of mesotheliomas of the tunica vaginalis; fibroadenomas of the mammary gland; gliomas of the brain; and neoplasms of the forestomach, intestine, skin, Zymbal gland, and thyroid gland. There was clear evidence of carcinogenic activity for female F344/N rats, based on increased incidences of fibroadenomas and adenocarcinomas of the mammary gland; gliomas of the brain; neoplasms of the oral mucosa, forestomach, clitoral gland, and thyroid gland; and leukemia. There was clear evidence of carcinogenic activity for male B6C3F1 mice based on increased incidences of neoplasms of the harderian gland, forestomach, skin, liver, and lung. There was clear evidence of carcinogenic activity for female B6C3F1 mice, based on increased incidences of neoplasms of the harderian gland, mammary gland, uterus, subcutaneous tissue, and skin. Other neoplasms that may have been related to the administration of glycidol were fibrosarcomas of the glandular stomach in female rats and carcinomas of the urinary bladder and sarcomas of the epididymis in male mice.

Source: US National Toxicology Program · TR-374: Toxicology and Carcinogenesis Studies of Glycidol (CASRN 556-52-5) In F344/N Rats and B6C3F1 Mice (Gavage Studies) (1990 )

No epidemiological data relevant to the carcinogenicity of glycidol were available. There is sufficient evidence in experimental animals for the carcinogenicity of glycidol. Overall evaluation: Glycidol is probably carcinogenic to humans (Group 2A).

Source: Hazardous Substances Data Bank (HSDB)

Glycidol: reasonably anticipated to be a human carcinogen.

Source: Hazardous Substances Data Bank (HSDB)

An IARC group and a CLP classification answer different questions. IARC judges whether the evidence for cancer in humans is strong enough; CLP Annex VI is the legally binding EU classification. A substance can carry one and not the other.

2,3-epoxypropan-1-ol occupational exposure limits

US occupational exposure limits reported for 2,3-epoxypropan-1-ol. PEL is enforceable (OSHA), REL is a recommendation (NIOSH), IDLH is the concentration at which escape becomes impossible without injury.
Limit Value Source
PEL 50.0 [ppm] Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
PEL 50 ppm (150 mg/m³) Occupational Safety and Health Administration (OSHA)
PEL TWA 50 ppm (150 mg/m3) See Appendix G The National Institute for Occupational Safety and Health (NIOSH)
REL 25 ppm (75 mg/m³) Occupational Safety and Health Administration (OSHA)
REL TWA 25 ppm (75 mg/m3) The National Institute for Occupational Safety and Health (NIOSH)
IDLH 150 ppm (NIOSH, 2024) CAMEO Chemicals
IDLH 150.0 [ppm] Haz-Map, Information on Hazardous Chemicals and Occupational Diseases
IDLH 150 ppm Hazardous Substances Data Bank (HSDB)

These are United States values. The European Union sets its own indicative and binding limits, and the figure that applies at a given workplace is the one in the local regulation — not the one shown here.

08 · Physical and chemical properties

2,3-epoxypropan-1-ol properties

Every value is shown with the conditions it was measured under and the source it came from. Where sources disagree, all values are listed rather than one being picked — the difference is usually a different form of the substance, not an error.

2,3-epoxypropan-1-ol boiling point

Property Value Conditions Source
Boiling point 160 °C (320 °F) decomposes NIOSH
167.22 °C (333 °F) decomposes, at 760 mmHg CAMEO

2,3-epoxypropan-1-ol melting point

Property Value Conditions Source
Melting point -45 °C (-49 °F) NIOSH

2,3-epoxypropan-1-ol density

Property Value Conditions Source
Density 1.12 g/cm³ NIOSH
1.143 g/cm³ at 25 °C HSDB
1.1143 g/cm³ at 25 °C CAMEO

2,3-epoxypropan-1-ol solubility

Property Value Conditions Source
Solubility Soluble in water, alcohol, and ether HSDB
Miscible with water /1.0X10+6 mg/L/ HSDB
Miscible NIOSH

2,3-epoxypropan-1-ol vapor pressure

Property Value Conditions Source
Vapor pressure 0.9 mmHg at 25 °C HSDB

2,3-epoxypropan-1-ol flash point

Property Value Conditions Source
Flash point 73 °C (163.4 °F) closed cup HSDB
72.22 °C (162 °F) NIOSH

2,3-epoxypropan-1-ol autoignition temperature

Property Value Conditions Source
Autoignition temperature 415 °C (779 °F) HSDB

2,3-epoxypropan-1-ol lower explosive limit (LEL)

Property Value Conditions Source
Lower explosive limit (LEL) Forms explosive mixture with air. HSDB
Class IIIA Combustible Liquid: Fl.P. at or above 140 °F and below 200 °F. NIOSH

2,3-epoxypropan-1-ol vapor density

Property Value Conditions Source
Vapor density 2.15 (air = 1) HSDB

Values compiled from PubChem Laboratory Chemical Safety Summary. Temperatures converted to Fahrenheit for reference.

09 · Fire and explosion

2,3-epoxypropan-1-ol fire and explosion behaviour

These are descriptions rather than measured values, so they are kept out of the table above and quoted here with the source that reported them.

Fire and explosion

Explodes when heated or in the presence of strong acids, bases, metals (e.g., copper, zinc), and metal salts (e.g., aluminum chloride, iron(III) chloride, tin(IV) chloride).

Source: HSDB

10 · Handling and storage

2,3-epoxypropan-1-ol storage and handling

2,3-epoxypropan-1-ol safe storage

Store only if stabilized. Cool. Dry. Well closed. Ventilation along the floor. Separated from strong bases, strong acids and food and feedstuffs.

Source: ILO-WHO International Chemical Safety Cards (ICSCs)

2,3-epoxypropan-1-ol storage conditions

Keep container tightly closed in a dry and well-ventilated place. Containers which are opened must be carefully resealed and kept upright to prevent leakage. Recommended storage temperature: 2 - 8 °C Moisture sensitive. Handle and store under inert gas.

Source: Hazardous Substances Data Bank (HSDB)

2,3-epoxypropan-1-ol incompatible materials

Violent reaction with strong oxidizers, nitrates. Decomposes on contact (especially in the presence of heat) with strong acids, strong bases, water, metal salts (e.g., aluminum chloride, ferric chloride, tin chloride) or metals (copper, zinc), causing fire and explosion hazard ... Attacks some plactics, rubber, and coatings.

Source: Hazardous Substances Data Bank (HSDB)

2,3-epoxypropan-1-ol reactivity

GLYCIDOL is sensitive to moisture. It is also sensitive to light. It may polymerize if heated above room temperature. It may darken on storage. Stability studies of this chemical stored for two week protected from light indicated definite decomposition at 140 °F, and strongly indicated instability at 77 °F. A solution of this compound in water was found to be unstable when stored at room temperature, even after one day in the dark. This chemical is incompatible with strong oxidizers. It will undergo explosive decomposition in the presence of strong acids or bases, salts (such as aluminum chloride, iron(III)chloride or tin(IV) chloride) or metals (such as copper and zinc). It is also incompatible with nitrates. It will attack some forms of plastics, rubber and coatings. (NTP, 1992)

Source: CAMEO Chemicals

Planning storage for a mix of chemicals? Check 2,3-epoxypropan-1-ol in the storage compatibility matrix →

11 · Questions

2,3-epoxypropan-1-ol — frequently asked questions

What is the CAS number of 2,3-epoxypropan-1-ol?

The CAS number of 2,3-epoxypropan-1-ol is 556-52-5. Its EC number is 209-128-3.

What is the chemical formula of 2,3-epoxypropan-1-ol?

The molecular formula of 2,3-epoxypropan-1-ol is C3H6O2 and its molecular weight is 74.08 g/mol.

What does a 2,3-epoxypropan-1-ol label have to show?

Under CLP Annex VI the label for 2,3-epoxypropan-1-ol carries the pictograms Skull and crossbones and Health hazard and the signal word is Danger.

Is 2,3-epoxypropan-1-ol flammable?

CLP Annex VI assigns 2,3-epoxypropan-1-ol no flammability hazard class. That is not a statement that it cannot burn: the harmonised list only records the hazards that were assessed for it. The flash point reported for it is 73 °C (163.4 °F), closed cup (HSDB).

Is 2,3-epoxypropan-1-ol a carcinogen?

Yes. CLP Annex VI classifies 2,3-epoxypropan-1-ol as a category 1A or 1B carcinogen and assigns it H350: may cause cancer. IARC places it in Group 2A: probably carcinogenic to humans.

What is the exposure limit for 2,3-epoxypropan-1-ol?

The US occupational exposure limit reported for 2,3-epoxypropan-1-ol is 50.0 [ppm] (Haz-Map, Information on Hazardous Chemicals and Occupational Diseases). Limits differ by country: the EU sets its own indicative and binding values, and the figure that applies at a given workplace is the one in the local regulation.

What is the boiling point of 2,3-epoxypropan-1-ol?

The boiling point reported for 2,3-epoxypropan-1-ol is 160 °C (320 °F), decomposes (NIOSH).

What is the melting point of 2,3-epoxypropan-1-ol?

The melting point reported for 2,3-epoxypropan-1-ol is -45 °C (-49 °F) (NIOSH).

How should 2,3-epoxypropan-1-ol be stored?

Keep container tightly closed in a dry and well-ventilated place. Containers which are opened must be carefully resealed and kept upright to prevent leakage. Recommended storage temperature: 2 - 8 °C Moisture sensitive. Handle and store under inert gas. (Hazardous Substances Data Bank (HSDB))

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