Are Propylene Glycol, Monopropylene Glycol and 1,2-Propanediol the same material?

Yes. Propylene glycol, monopropylene glycol and 1,2-propanediol identify CAS 57-55-6. They are not dipropylene glycol, polypropylene glycol or ethylene glycol. The product name also does not establish USP, food, feed or cosmetic suitability, so state the required grade.

What is Propylene Glycol used for?

Propylene glycol is used as a solvent, humectant, heat-transfer fluid and process intermediate in many industrial and formulated products. The CAS identifies a chemical substance, not a food, pharmaceutical, cosmetic or industrial grade, so the intended use and required specification must be stated.

Which specifications should be agreed for industrial Propylene Glycol?

Confirm propylene glycol assay, water, colour, acidity, specific gravity, distillation range, residue and relevant aldehyde or glycol impurities with the stated methods. Do not transfer a USP or food-grade specification to industrial propylene glycol, and confirm the test methods against the current product specification.

What should be confirmed before bulk Propylene Glycol delivery?

Confirm drum, IBC or tank format, net quantity, container compatibility, seal condition, previous cargo where applicable, moisture protection, sampling and unloading connection. Propylene glycol is hygroscopic, so water pickup and container cleanliness should be controlled.

Why should industrial Propylene Glycol not be assumed to meet USP or food-grade limits?

CAS 57-55-6 identifies the chemical substance, not a food, pharmaceutical, cosmetic or industrial grade. USP, EP and food grades have tighter purity limits, especially for ethylene glycol and diethylene glycol, and different test methods. State the intended use and required grade before comparing suppliers.

Propylene Glycol CAS 57-55-6

Propylene Glycol, CAS 57-55-6, is also called propane-1,2-diol or MPG. Specify the required grade and current specification for the intended formulation or process; do not assume USP, food or cosmetic grade from the product name alone.

CAS: 57-55-6
Synonyms: Propylene glycol; 1,2-Propanediol; Propane-1,2-diol; MPG
Einecs: 200-338-0
Molecular Formula: C₃H₈O₂
Grade: Confirm the current product specification for the offered material.
Package: Confirm packaging suitable for the offered material and destination requirements.

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Product Description

1 Product overview

2 Identity and specification review

3 Technical context

3.1 Identity and grade selection

3.2 Formulation and process evaluation

3.3 Application boundary

4 Specification and documentation

5 Storage and safety

5.1 Handling and storage

5.2 Safety review

Product overview

Propylene Glycol, CAS 57-55-6, is also known as propane-1,2-diol or MPG.

The CAS identifies a chemical substance, not a food, pharmaceutical, cosmetic, or industrial grade. Required grade and specification must be stated for the intended use.

Specification and documentation

For product evaluation, state the required grade, quantity, packaging, destination, and document requirements.

This page does not confirm compliance with USP or EP, a specific package, price, or document availability.

Identity and specification review

Field	Current page status	Buyer check
Product identity	Propylene Glycol CAS 57-55-6	Match identity to current product documentation.
CAS number	57-55-6	Use the CAS number to avoid a name-only match.
Molecular formula	C₃H₈O₂	Confirm the current specification for the proposed product.
Chemical class	A 1,2-diol	Confirm suitability for the intended process.
Product form	Not specified on this page.	Confirm the actual offered form and test method.
Assay and grade	Not specified on this page.	State the required assay and impurity criteria.
Impurity criteria	Not specified on this page.	State limits relevant to the intended use.
Packaging	Not specified on this page.	Confirm packaging for the destination requirements.
Documents	Not specified on this page.	State the documents required for evaluation.

Technical context

Identity and grade selection

MPG is an established abbreviation for Propylene Glycol.

Formulation and process evaluation

Potential use in a formulation or process must be assessed against the requested grade and current specification of the material proposed.
Confirm suitability for the intended process.

Application boundary

Do not infer food, pharmaceutical, cosmetic, antifreeze, or resin suitability from the name alone.
Do not treat general reference information as a shipped-lot specification.

Specification and documentation

This page does not confirm a supplier specification, package, certificate, or document availability.

Request a current product specification that matches the intended use.
Confirm whether any requested document is available for the offered material.
Confirm packaging after the product form and destination requirements are known.

For related industrial diol raw materials, see Butylene Glycol and 1,3-Propanediol.

Storage and safety

Handling and storage

This page is not a storage or handling instruction.
Review the current SDS for the exact material proposed before handling, storage, or transport decisions.
The receiving site should set controls for its own process and local requirements.

Safety review

Confirm hazard classification and transport classification from current product documentation.
Determine PPE and emergency measures from the current SDS and site assessment.
Confirm compatibility with the intended process before use.

FAQ - Technical & Supply Chain

Q:
Are Propylene Glycol, Monopropylene Glycol and 1,2-Propanediol the same material?

A: Yes. Propylene glycol, monopropylene glycol and 1,2-propanediol identify CAS 57-55-6. They are not dipropylene glycol, polypropylene glycol or ethylene glycol. The product name also does not establish USP, food, feed or cosmetic suitability, so state the required grade.
Q:
What is Propylene Glycol used for?

A: Propylene glycol is used as a solvent, humectant, heat-transfer fluid and process intermediate in many industrial and formulated products. The CAS identifies a chemical substance, not a food, pharmaceutical, cosmetic or industrial grade, so the intended use and required specification must be stated.
Q:
Which specifications should be agreed for industrial Propylene Glycol?

A: Confirm propylene glycol assay, water, colour, acidity, specific gravity, distillation range, residue and relevant aldehyde or glycol impurities with the stated methods. Do not transfer a USP or food-grade specification to industrial propylene glycol, and confirm the test methods against the current product specification.
Q:
What should be confirmed before bulk Propylene Glycol delivery?

A: Confirm drum, IBC or tank format, net quantity, container compatibility, seal condition, previous cargo where applicable, moisture protection, sampling and unloading connection. Propylene glycol is hygroscopic, so water pickup and container cleanliness should be controlled.
Q:
Why should industrial Propylene Glycol not be assumed to meet USP or food-grade limits?

A: CAS 57-55-6 identifies the chemical substance, not a food, pharmaceutical, cosmetic or industrial grade. USP, EP and food grades have tighter purity limits, especially for ethylene glycol and diethylene glycol, and different test methods. State the intended use and required grade before comparing suppliers.

Ordering & Documentation

Key information for document requests, quotations, and supply planning.

Documents

COA, TDS, SDS/MSDS and packing details are available on request.

Quotation

Send the CAS number, grade, quantity, packing preference and destination.

Sample & Supply

Support is available for samples, trial orders, bulk and repeat supply.

Storage & Shipping

Product-specific conditions are confirmed before order.

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