Sodium Dodecyl Sulphate

Product NameSodium Dodecyl Sulphate
CAS151-21-3
MFC12H25NaO4S
MW288.38
EINECS205-788-1
MOL File151-21-3.mol

Chemical Properties

Melting point	204-207 °C (lit.)
Density	1.03 g/mL at 20 °C
FEMA	4437 \| SODIUM LAURYL SULFATE
Flash point	>100°C
storage temp.	2-8°C
solubility	H₂O: 0.1 M, clear to nearly clear, colorless to slightly yellow
form	Powder or Crystals
color	White to pale yellow
PH	6-9 (10g/l, H2O, 20℃)
Odor	Slight fatty odour
PH Range	7.2
Water Solubility	ca. 150 g/L (20 ºC)
λmax	λ: 260 nm Amax: 0.3 λ: 280 nm Amax: 0.2
Merck	14,8636
BRN	3599286
InChIKey	DBMJMQXJHONAFJ-UHFFFAOYSA-M
LogP	1.600
CAS DataBase Reference	151-21-3(CAS DataBase Reference)
EPA Substance Registry System	Sodium lauryl sulfate (151-21-3)

Safety Information

Hazard Codes	F,Xn,Xi
Risk Statements	36/37/38-36/38-22-11-21/22-42-41-20/21/22-37/38
Safety Statements	26-36/37-36/37/39-36-22-39
RIDADR	UN 2926 4.1/PG 2
WGK Germany	2
RTECS	WT1050000
F	3
TSCA	Yes
HazardClass	4.1
PackingGroup	III
HS Code	29209010
Hazardous Substances Data	151-21-3(Hazardous Substances Data)
Toxicity	LD50 orally in rats: 1288 mg/kg (Walker)

MSDS

Provider	Language
Lauryl sulfate sodium salt	English
SigmaAldrich	English
ACROS	English
ALFA	English

Usage And Synthesis

Description

Sodium dodecyl sulphate is an anionic surfactant, and is a typical representative of sulphate-based surfactant. It is abbreviated as SDS, and also known as AS, K12, coco alcohol sulfate, sodium lauryl sulfate and foaming agent.

Sodium Dodecyl Sulphate.png

Physical properties

Sodium Dodecyl Sulphate is usually white to light yellow crystalline powder. It is non-toxic, slightly soluble in alcohol, insoluble in chloroform and ether, soluble in water, and has good anionic and nonionic complex compatibility.

Characteristics

Sodium dodecyl sulphate has good emulsibility, foamability, and foaming, infiltrating, decontaminating and dispersing properties. It is abundant in foams and quickly biodegradable, and has solubility next only to fatty alcohol polyoxyethylene ether sodium sulphate (abbreviated as AES).

Uses

Sodium dodecyl sulphate is a major component of detergent. It is usually used in the DNA extraction process to separate DNA after protein denaturation. It is often misread as sodium dodecyl sulfonate. It is widely used as a foaming agent in toothpaste, soap, shower gel, shampoo, detergent and cosmetics.

Health Hazard

Toxicity LD50 is 1300mg/kg. There is no evidence that sodium dodecyl sulphate is carcinogenic, but high doses may indeed irritate the skin.

Incompatibilities

Sodium dodecyl sulphate is incompatible with strong oxidizers, and it is also incompatible with cationic materials and with acids with pH below 2.5. They usually do not react as either oxidizing agents or reducing agents but such behavior is not impossible.