What is n-Undecane CAS 1120-21-4?

n-Undecane, also called undecane or hendecane, is a linear saturated C11 alkane with the molecular formula C11H24 and molecular weight 156.31 g/mol. It is a colorless clear liquid with a mild hydrocarbon odor, EC number 214-300-6, and is supplied for analytical, laboratory, and industrial use.

What are the main uses of n-Undecane?

It is commonly used as a reference hydrocarbon and internal standard in gas chromatography, a nonpolar specialty solvent in organic synthesis, and a model compound in combustion or fuel research. It can also serve as a carrier fluid, diluent, or intermediate in controlled hydrocarbon formulations.

Why is n-Undecane used as a GC reference standard?

Because its boiling point and retention time are well defined, n-Undecane is useful for retention-time comparison, Kovats index calibration, and hydrocarbon fingerprinting. Its known Kovats retention index around 1100 makes it a convenient marker for alkane analysis.

What is the difference between n-Undecane and branched undecane isomers?

n-Undecane is the straight-chain C11 alkane with a defined boiling point around 195-196 degC and density about 0.74 g/cm3. Branched undecane isomers have different molecular geometry, boiling points, density, combustion behavior, and chromatographic retention, so they are not interchangeable with pure linear n-undecane.

How should n-Undecane be handled and stored?

Handle it as a flammable hydrocarbon liquid and store it in a cool, well-ventilated area away from ignition sources and direct sunlight. Keep containers tightly closed when not in use to reduce evaporation, odor release, and contamination.

n-Undecane CAS 1120-21-4

n-Undecane is supplied as a straight-chain (C11) alkane hydrocarbon, typically used in applications where defined hydrocarbon structure and controlled volatility are required. It is positioned as a specialty solvent and reference compound rather than a bulk fuel component.

In industrial and laboratory contexts, n-Undecane is used as a reference standard in analytical work, a calibration component in fuel or hydrocarbon analysis, and as a solvent or intermediate in chemical processing systems. It is generally supplied as a clear liquid suitable for direct use or blending. Standard packaging, bulk supply, and technical documentation such as COA, TDS, and SDS are available to support procurement and application needs.

CAS: 1120-21-4
Synonyms: Undecane; n-Undecane
Einecs: 214-300-6
Molecular Formula: C11H24
Grade: Industrial / analytical grade (depending on application)
Package: Available in standard liquid chemical packaging; packaging arranged according to order volume

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Product Description

1 Physicochemical Properties

2 Typical Applications

3 Packaging

4 Storage

Physicochemical Properties

Item	Typical Value
Appearance	Colorless clear liquid
Odor	Mild hydrocarbon odor
Molecular Weight	156.31 g/mol
Boiling Point	Approx. 195–196°C
Melting Point	Approx. -26°C
Density (20°C)	Approx. 0.74 g/cm³
Flash Point	Approx. 65°C
Solubility	Insoluble in water; miscible with organic solvents

Typical Applications

Reference hydrocarbon in analytical chemistry and calibration systems
Component in fuel research and hydrocarbon analysis
Specialty solvent in organic synthesis and laboratory processes
Intermediate in controlled hydrocarbon formulation systems

For related hydrocarbon and alkane pages, compare Isodecane and n-Octadecane.

Packaging

n-Undecane is supplied as a liquid and is typically packed in sealed drums, metal cans, or other suitable containers for hydrocarbon products. Packaging is selected to ensure safe transport, minimize evaporation, and maintain product purity. Bulk supply options can be arranged depending on order size and logistics requirements.

Storage

Store in a cool, well-ventilated area away from sources of ignition and direct sunlight. Keep containers tightly closed when not in use to prevent evaporation and contamination. Handle and store in accordance with standard practices for flammable hydrocarbon liquids.

FAQ - Technical & Supply Chain

Q:
What is n-Undecane CAS 1120-21-4?

A: n-Undecane, also called undecane or hendecane, is a linear saturated C11 alkane with the molecular formula C11H24 and molecular weight 156.31 g/mol. It is a colorless clear liquid with a mild hydrocarbon odor, EC number 214-300-6, and is supplied for analytical, laboratory, and industrial use.
Q:
What are the main uses of n-Undecane?

A: It is commonly used as a reference hydrocarbon and internal standard in gas chromatography, a nonpolar specialty solvent in organic synthesis, and a model compound in combustion or fuel research. It can also serve as a carrier fluid, diluent, or intermediate in controlled hydrocarbon formulations.
Q:
Why is n-Undecane used as a GC reference standard?

A: Because its boiling point and retention time are well defined, n-Undecane is useful for retention-time comparison, Kovats index calibration, and hydrocarbon fingerprinting. Its known Kovats retention index around 1100 makes it a convenient marker for alkane analysis.
Q:
What is the difference between n-Undecane and branched undecane isomers?

A: n-Undecane is the straight-chain C11 alkane with a defined boiling point around 195-196 degC and density about 0.74 g/cm3. Branched undecane isomers have different molecular geometry, boiling points, density, combustion behavior, and chromatographic retention, so they are not interchangeable with pure linear n-undecane.
Q:
How should n-Undecane be handled and stored?

A: Handle it as a flammable hydrocarbon liquid and store it in a cool, well-ventilated area away from ignition sources and direct sunlight. Keep containers tightly closed when not in use to reduce evaporation, odor release, and contamination.

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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