What is Steareth-21 CAS 9005-00-9?

Steareth-21 is a nonionic ethoxylated stearyl alcohol, also known as polyoxyethylene stearyl ether or PEG stearyl ether. It has CAS 9005-00-9, EC 500-017-8, and is normally supplied as a white to off-white solid, flake, pellet, or waxy mass.

Is Steareth-21 a single pure compound?

No. Commercial Steareth-21 is an ethoxylated fatty alcohol mixture with a nominal number of ethylene oxide units. It is characterized by HLB, melting range, physical form, and application specifications rather than treated as one isolated laboratory molecule.

What HLB value should be expected for Steareth-21?

Steareth-21 is a high-HLB O/W emulsifier. Typical supplier values are about 15.0-15.5, so it is used as the hydrophilic emulsifier in oil-in-water cream and lotion systems rather than as a low-HLB co-emulsifier.

How is Steareth-21 different from Steareth-2 or Steareth-20?

The number indicates a different nominal degree of ethoxylation. Steareth-21 has a longer EO chain and higher HLB than Steareth-2, and should not be used interchangeably with Steareth-20 or other steareth grades without checking the target emulsion type and HLB balance.

Where is Steareth-21 mainly used?

It is mainly used as a nonionic emulsifier and formulation aid in oil-in-water creams, lotions, and cosmetic or personal care emulsions. It is often combined with a lower-HLB emulsifier, fatty alcohol, or consistency agent to build a stable emulsion system.

Steareth-21 CAS 9005-00-9

Steareth-21 is a nonionic ethoxylated fatty alcohol derivative typically used as an emulsifier and formulation aid in emulsion-based systems. In supplier practice, it is generally positioned as a formulation ingredient rather than a single pure compound. It is commonly selected for cream, lotion, and related liquid or semi-solid formulations where stable oil-in-water emulsification and formulation compatibility are required. Supply can be arranged in standard export packaging, with document support such as COA, TDS, and SDS available according to customer and order requirements.

CAS: 9005-00-9
Synonyms: Steareth-21; Polyethylene Glycol Octadecyl Ether; Polyoxyethylene Stearyl Ether
Einecs: 500-017-8
Grade: Can be supplied according to agreed formulation or application requirements.
Package: Available in standard export packaging. Packaging can be arranged according to supply form and order volume.

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Product Description

1 Physicochemical Properties

2 Typical Applications

3 Packaging

4 Storage

Physicochemical Properties

Item	Typical Description
Appearance	White to off-white solid, flakes, pellets, or waxy mass depending on grade and temperature
Odor	Mild characteristic odor
Physical Nature	Nonionic surfactant / emulsifier
Melting Point	Typically around 56–60°C
Density	Typical literature value reported around 0.964 g/mL at 25°C
Vapor Pressure	Very low under normal handling conditions
Flash Point	Reported above 230°F
Solubility	Used as a surfactant/emulsifier in formulation systems; practical solubility behavior depends on grade and formulation medium
HLB	Typically reported around 15.0-15.5

Typical Applications

Emulsifier for cream and lotion systems
Formulation aid in oil-in-water emulsion development
Nonionic surfactant component in personal care and cosmetic formulations
Used in combination systems with other fatty alcohols, emulsifiers, or consistency agents

Specific end uses should be evaluated according to local regulatory requirements and actual formulation conditions.

For related nonionic emulsifier pages, compare Cetearyl Glucoside, Polysorbate 80, and Ceteareth-30.

Packaging

Steareth-21 is generally supplied in sealed containers suitable for solid or semi-solid surfactant materials. Standard export packaging can be arranged according to order quantity, supply form, and logistics requirements. Clean container handling and proper sealing are recommended to help protect the material during storage and transport.

Storage

Store in a cool, dry, and well-ventilated place in tightly closed original packaging. Keep away from excessive heat, direct sunlight, and sources of contamination. Package integrity should be maintained during storage and transportation. Where the material softens under elevated temperature, containers should be kept properly closed and handled in a clean environment.

FAQ - Technical & Supply Chain

Q:
What is Steareth-21 CAS 9005-00-9?

A: Steareth-21 is a nonionic ethoxylated stearyl alcohol, also known as polyoxyethylene stearyl ether or PEG stearyl ether. It has CAS 9005-00-9, EC 500-017-8, and is normally supplied as a white to off-white solid, flake, pellet, or waxy mass.
Q:
Is Steareth-21 a single pure compound?

A: No. Commercial Steareth-21 is an ethoxylated fatty alcohol mixture with a nominal number of ethylene oxide units. It is characterized by HLB, melting range, physical form, and application specifications rather than treated as one isolated laboratory molecule.
Q:
What HLB value should be expected for Steareth-21?

A: Steareth-21 is a high-HLB O/W emulsifier. Typical supplier values are about 15.0-15.5, so it is used as the hydrophilic emulsifier in oil-in-water cream and lotion systems rather than as a low-HLB co-emulsifier.
Q:
How is Steareth-21 different from Steareth-2 or Steareth-20?

A: The number indicates a different nominal degree of ethoxylation. Steareth-21 has a longer EO chain and higher HLB than Steareth-2, and should not be used interchangeably with Steareth-20 or other steareth grades without checking the target emulsion type and HLB balance.
Q:
Where is Steareth-21 mainly used?

A: It is mainly used as a nonionic emulsifier and formulation aid in oil-in-water creams, lotions, and cosmetic or personal care emulsions. It is often combined with a lower-HLB emulsifier, fatty alcohol, or consistency agent to build a stable emulsion system.

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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