Name: China Chemical Factory Supply Top Purity Sodium Dodecyl sulfate CAS 151-21-3 with good service
Brand: Wuhan Fortuna Chemical Co., Ltd.

Specifications of Sodium Dodecyl Sulfate CAS 151-21-3

Items	Specifications	Results
Characters	Description:Small,white or light yellow crystals having a slight,characteristic odor.	Conforms
Characters	Solubility:Freely soluble in water,forming an opalescent solution.	Conforms
Identification	A.Infrared absorption<197K>or<197A>	Conforms
	B.Sodium	Conforms
	C.Sulfate	Conforms
	D.A copious foam is formed	Conforms
	E.Chemical reaction	Conforms
Sodium chloride	The combined content of sodium chloride and sodium sulfate is NMT8.0%	0.03%
Sodium sulfate	The combined content of sodium chloride and sodium sulfate is NMT 8.0%	0.6%
Alkalinity	NMT 0.5ml for neutralization	Conforms
Total alcohols	The residue represents the total alcohols and is NLT 59.0% of the weight of Sodium Lauryl sulfate taken.	62.5%
Unsulfated alcohol	The weight of the residue is NMT 4.0% of the weight of Sodium Lauryl Sulfate taken.	0.7%
Assay	NLT 85.0%,calculated as Sodium Lauryl Sulfate.	95.9%
Conclusion	The product conforms to the above specifications.

Parameters of Sodium Dodecyl Sulfate CAS 151-21-3

Product parameters
Cas number:	151-21-3
Appearance:	White powder or white needle pillar
Purity:	95% min, 99%min
Package details:	25kg/bag
Brand:	Fortunachem

Sodium dodecyl sulfate (SDS), also known as sodium lauryl sulfate (SLS), is a synthetic organic compound and one of the most widely used surfactants (surface-active agents). Its chemical formula is CH₃(CH₂)₁₁OSO₃Na.

It consists of:

A hydrophobic 12-carbon tail (a dodecyl or lauryl chain).
A hydrophilic sulfate head group (negatively charged, anionic).

This amphiphilic structure allows it to reduce surface tension between liquids, solids, and gases, making it excellent at solubilizing, emulsifying, and foaming.

Key Properties & Mechanism

Anionic Surfactant: Carries a negative charge when dissolved in water.
Powerful Detergent: Disrupts non-covalent bonds in proteins and lipids, solubilizing them.
Denaturing Agent: Unfolds proteins by breaking their native 3D structure.
Excellent Foaming Agent: Creates abundant, stable lather.

Major Uses of SDS

1. Laboratory & Research

This is where the name SDS is primarily used.

SDS-PAGE (Polyacrylamide Gel Electrophoresis): The most critical use. SDS binds to and denatures proteins, giving them a uniform negative charge. This allows separation in a gel based solely on molecular weight, a fundamental technique in biochemistry and molecular biology.
Cell Lysis & Nucleic Acid Extraction: Used to break open cell membranes and nuclei to release DNA/RNA during purification protocols.
Cleaning Laboratory Glassware: Effective at removing organic residues.

2. Industrial & Manufacturing

Emulsion Polymerization: Acts as a surfactant to stabilize polymer particles (e.g., in synthetic rubber, polystyrene, and acrylic paints) during production.

3. Consumer Products

Here, it is most commonly listed as SLS or sodium lauryl sulfate.

Cleaning Products: A primary detergent in laundry detergents, dish soaps, and household cleaners.
Personal Care & Cosmetics:

Toothpaste: Creates foaming action, helping to disperse ingredients.
Shampoos, Shower Gels, Bubble Baths: Provides the rich lather that consumers associate with cleaning efficacy.
Shaving Creams: Acts as a foaming agent and lubricant.
Hand Soaps: Provides detergency and lather.

SDS vs. SLES: An Important Distinction

SDS/SLS is often confused with Sodium Laureth Sulfate (SLES). They are related but different:

SLES (CH₃(CH₂)₁₁(OCH₂CH₂)ₙOSO₃Na) contains an ethylene oxide chain, making it much milder and less irritating to skin and eyes.
SLES is far more common in personal care products like shampoos and body washes.
SDS is a stronger, more potent irritant but is highly valued in laboratories for its predictable, strong denaturing action.

Safety and Controversy

Irritation: SDS can be a skin, eye, and mucous membrane irritant, especially in high concentrations. This is why its concentration is controlled in consumer products.
"Sulfate-Free" Trend: Many personal care brands now market "sulfate-free" products, claiming benefits like being gentler on skin/hair and preserving hair color. This is primarily about avoiding SLS and SLES.
Misconceptions: While it can be drying or irritating for some individuals, extensive scientific reviews have found no evidence that SLS in cosmetics is a significant carcinogen. Regulatory bodies worldwide consider it safe for use in rinse-off products and at limited levels in leave-on products.

Summary

Context	Common Name	Primary Use
Laboratory	SDS	Denaturing protein for electrophoresis (SDS-PAGE); cell lysis.
Industry	SLS/SDS	Emulsion polymerization for plastics, rubber, and paints.
Consumer Goods	SLS	Foaming and detergent agent in toothpastes, shampoos, cleansers, and soaps.

In essence, SDS is a versatile workhorse surfactant: it's the scientific standard for protein analysis in labs and the engine behind lather in many everyday cleaning and personal care products.