What is Propylene Oxide CAS 75-56-9?

Propylene oxide, also called methyloxirane or 1,2-epoxypropane, is a reactive epoxide with CAS 75-56-9, EINECS 200-879-2 and molecular formula C₃H₆O. It is a colorless, highly volatile liquid with an ether-like odor.

What is Propylene Oxide used for?

It is a major intermediate for polyether polyols used in polyurethane foams, coatings, adhesives, sealants and elastomers. It is also used to produce propylene glycol, propylene glycol ethers and other alkoxylated or surfactant intermediates.

Are Propylene Oxide, methyloxirane and 1,2-epoxypropane the same product?

Yes. Propylene oxide, methyloxirane, 1,2-epoxypropane, propylene epoxide and methyl ethylene oxide are common names for the same compound, CAS 75-56-9.

Why is Propylene Oxide supplied as a racemic mixture?

The epoxide carbon in propylene oxide is chiral, so the molecule exists as two enantiomers. Standard industrial production normally gives a racemic mixture of both enantiomers, which is suitable for most polyether, glycol and alkoxylation applications.

How should Propylene Oxide be stored and handled?

Store it in tightly sealed, pressure-rated containers in a cool, dry, ventilated area away from heat, sparks, acids, bases and strong oxidizers. Industrial systems commonly use stainless steel with nitrogen blanketing and keep storage temperature below about 30 °C.

Propylene Oxide CAS 75-56-9

Propylene Oxide (methyloxirane), CAS 75-56-9, is a reactive epoxide used as a major intermediate for polyether polyols in polyurethane foams, coatings and adhesives, and for propylene glycol, glycol ethers and non-ionic surfactants. Confirm the required grade and stabilizer level, then request a quotation with COA/TDS/SDS for bulk supply.

CAS: 75-56-9
Synonyms: Methyloxirane, 1,2-Epoxypropane, Propylene epoxide, Methyl ethylene oxide, 1,2-Propylene oxide
Einecs: 200-879-2
Molecular Formula: C₃H₆O
Grade: Industrial grade 99%
Package: 200kg iron drum or 50kg plastic drum packing

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Product Description

Propylene Oxide, CAS 75-56-9, is methyloxirane, a reactive epoxide; the EC/EINECS number is 200-879-2.

Synonyms: Methyloxirane; 1,2-Epoxypropane; Propylene epoxide; Methyl ethylene oxide; 1,2-Propylene oxide.

CAS: 75-56-9.

Molecular formula: C₃H₆O.

Molecular weight: 58.08.

EC number: 200-879-2.

It is a colorless, highly volatile liquid with an ether-like odor; the melting point is about -112 °C, the boiling point about 34 °C and the density about 0.83 g/cm³.

It is highly flammable, with a flash point below -37 °C.

It is soluble in water and miscible with most organic solvents.

Its epoxide carbon is chiral, and the industrial product is normally supplied as a racemic mixture.

It is produced by the chlorohydrin or hydrogen peroxide route.

It is a major intermediate for polyether polyols used in polyurethane foams, coatings, adhesives, sealants and elastomers.

It is used to produce propylene glycol, propylene glycol ethers and non-ionic surfactants.

Confirm assay, water, aldehydes, acidity and color.

Store in tightly sealed, pressure-rated stainless-steel containers under nitrogen blanketing, below about 30 °C, away from heat, sparks, acids, bases and strong oxidizers.

Confirm the current product-specific specification.

Confirm packaging with the requested quantity and destination requirements.

Document requirements should be confirmed from the current specification, SDS, COA, or other product-specific files.

The page is an RFQ entry point and does not state stock, price, MOQ, or fixed lead time.

For an RFQ, state the intended use, required specification, quantity, packaging, destination, and document needs.

FAQ - Technical & Supply Chain

Q:
What is Propylene Oxide CAS 75-56-9?

A: Propylene oxide, also called methyloxirane or 1,2-epoxypropane, is a reactive epoxide with CAS 75-56-9, EINECS 200-879-2 and molecular formula C₃H₆O. It is a colorless, highly volatile liquid with an ether-like odor.
Q:
What is Propylene Oxide used for?

A: It is a major intermediate for polyether polyols used in polyurethane foams, coatings, adhesives, sealants and elastomers. It is also used to produce propylene glycol, propylene glycol ethers and other alkoxylated or surfactant intermediates.
Q:
Are Propylene Oxide, methyloxirane and 1,2-epoxypropane the same product?

A: Yes. Propylene oxide, methyloxirane, 1,2-epoxypropane, propylene epoxide and methyl ethylene oxide are common names for the same compound, CAS 75-56-9.
Q:
Why is Propylene Oxide supplied as a racemic mixture?

A: The epoxide carbon in propylene oxide is chiral, so the molecule exists as two enantiomers. Standard industrial production normally gives a racemic mixture of both enantiomers, which is suitable for most polyether, glycol and alkoxylation applications.
Q:
How should Propylene Oxide be stored and handled?

A: Store it in tightly sealed, pressure-rated containers in a cool, dry, ventilated area away from heat, sparks, acids, bases and strong oxidizers. Industrial systems commonly use stainless steel with nitrogen blanketing and keep storage temperature below about 30 °C.

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