C3H6O
58.08 g/mol
Industrial ChemicalDanger
Propylene oxide
CAS75-56-9EC200-879-2
Category
Industrial Chemical
Compound Class
Heterocycle
Primary Use
Production of polyethers and propylene glycol
Propylene oxide is an industrial chemical primarily used as an intermediate in the production of polyethers and propylene glycol. It has been identified as a potential human carcinogen by an independent committee of scientific and health experts.
Production of polyethers (primary component of polyurethane foams)Production of propylene glycolPreparation of slides for electron microscopy
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
Restricted or banned substances
Substances on this list are banned or restricted under the named regulation. This page is a compliance reference — verify your obligations under applicable law.
Relevant lists:California Proposition 65
CAS 75-56-9
Related Compounds
ReferenceSame Category
Tetramethylammonium chloride
CAS75-57-0
Clay stabilizer and chemical intermediate
ReferenceSame Category
Dibromodifluoromethane
CAS75-61-6
Fire extinguishing agent
ReferenceSame Category
Tert-butylamine
CAS75-64-9
Chemical intermediate for rubber accelerators and insecticides
ReferenceSame Category
Tert-butyl alcohol
CAS75-65-0
Solvent, denaturant, and gasoline additive
Referencestereoisomer of
(R)-1,2-epoxypropane
CAS15448-47-2
production of polyether polyols
Referencestereoisomer of
(S)-1,2-epoxypropane
CAS16088-62-3
Production of polyether polyols for polyurethane plastics
Referencestereoisomer of
2-(²H₃)Methyl(²H₃)oxirane
CAS202468-69-7
research compound
Safety Reference
Danger
H224Extremely flammable liquid and vapour
H302Harmful if swallowed
H311Toxic in contact with skin
H319Causes serious eye irritation
H331Toxic if inhaled
H335May cause respiratory irritation
H340May cause genetic defects
H350May cause cancer
H312Harmful in contact with skin
H315Causes skin irritation
H332Harmful if inhaled
H317May cause an allergic skin reaction
H318Causes serious eye damage
H336May cause drowsiness or dizziness
H341Suspected of causing genetic defects
H351Suspected of causing cancer
H361Suspected of damaging fertility or the unborn child
H314Causes severe skin burns and eye damage
H330Fatal if inhaled
Customs Tariff Classification
The international HS code for Propylene oxide (CAS 75-56-9) is 2910.20.
HS code (international, 6-digit)
2910.20
EU CN code (8-digit)
2910 20 00
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
Identifiers
IUPAC Name
2-methyloxirane
InChIKey
GOOHAUXETOMSMM-UHFFFAOYSA-N
SMILES
CC1CO1
Synonyms (46)
- Propylene oxide, United States Pharmacopeia (USP)
- (R)-2-Methyloxirane
- (RS)-methyloxirane
- (rs)-propylene oxide
- 1,2-Epoxypropane
- 1,2-PROPYLENE OXIDE
- 1,2-epoxipropane
- 1,2-propylenoxide
- 2,3-Epoxypropane
- 2-Methyloxiran
- 2-Methyloxirane
- 3-Methyl-1,2-epoxypropane
- AD 6
- AD 6 (suspending agent)
- Caswell No. 713A
- DL-1,2-EPOXYPROPANE
- Epihydrin
- Epoxypropane
- Ethylene oxide, methyl-
- Methyl ethylene oxide
- Methyl-(S)-Oxirane
- Methyloxacyclopropane
- Methyloxirane
- Oxirane, methyl-
- Oxyde de propylene
- Oxyde de propylene [French]
- Propane, 1,2-epoxy-
- Propane, epoxy-
- Propene oxide
- Propylene epoxide
- Propylene oxide
- Propylene oxide (JAN)
- S(-)-Methyloxirane
- oxirane, 2-methyl-
- propene epoxide
- proplyene oxide
- propylenoxide
- rac-propylene oxide