octadecanoic acid

Basic Information

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CAS Number

57-11-4

Molecular Formula

C18H36O2

Molecular Weight

284.48 g/mol

Chemical Classification

Basic Chemical Raw Materials Organic Chemicals Carboxylic Acids

Fine Chemicals Surfactants Anionic Surfactants

Basic Physical Properties

Physical State

Powder

Melting Point

68.0 to 71.0 deg-C

Boiling Point

361 °C

Water Solubility

0.1-1 g/100 mL at 23 ºC

Solubility

1 to 10 mg/mL at 73° F (NTP, 1992)

Refractive Index

1.4299

Vapor Pressure

1 mmHg ( 173.7 °C)

Vapor Density

9.8 (NTP, 1992) (Relative to Air)

Odor

Slight odor suggesting tallow

SMILES

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CCCCCCCCCCCCCCCCCC(O)=O

InChI

InChI=1S/C18H36O2/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18(19)20/h2-17H2,1H3,(H,19,20)

InChIKey

QIQXTHQIDYTFRH-UHFFFAOYSA-N

LogP

6.332500000000007

Topological Polar Surface Area

37.3 Å²

Hydrogen Bond Donor/Acceptor

1 / 2

Complexity

202

Safety Information

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GHS Hazard Pictograms

H315

Hazard Statement

H315 Causes skin irritation
Skin corrosion/irritation

Storage Conditions

2-8℃

Sensitiveness

prone to absorb moisture

Toxicity

LD50 i.v. in mice, rats: 23±0.7, 21.5±1.8 mg/kg, L. Or, A. Wretlind, Acta Pharmacol. Toxicol. 18, 141 (1961)

Synonyms & References

English

Stearic acid
ACIDUM STEARICUM 50
C18
C18:0 FATTY ACID
CARBOXYLIC ACID C18
CETYLACETIC ACID
FEMA 3035
N-OCTADECANOIC ACID
N-OCTADECYLIC ACID
OCTADECANEDIOIC ACID
RARECHEM AL BO 0157
1-Heptadecanecarboxylic acid
1-Heptadecanecarboxylic acid Ro 5-2807
400JB9103-88
acideoctadecylique
acidestearique
AdekaFattyAcidSA910
Barolub FTA
Octadecanoic acid (Stearic)
SILICA GEL HEXANE EXTRACTED MATERIAL
Stearic Acid RG (rubber grade)
Stearic Acid TP
STEARIC ACID(P)
STEARIC ACID(P) PrintBack
yingzhisuan
F-300, F-1000, F-1500, F-2000, F-3000
groco54
groco55
groco58
groco59
kam1000

MDL Number

MFCD00153444

Customs Code

2915701000

FAQ

What is octadecanoic acid (CAS: 57-11-4)?

Octadecanoic acid, also known as stearic acid (CAS: 57-11-4), is a saturated fatty acid with the chemical formula C18H36O2. It is a white, waxy solid with a high melting point (around 70°C). Commonly found in animal and plant fats, it is used as a lubricant, emulsifier, and stabilizer. Its long hydrocarbon chain makes it hydrophobic, while the carboxylic acid group allows reactivity in chemical processes. It is widely applied in cosmetics, food, and industrial sectors due to its versatile properties.

What are the main uses of octadecanoic acid (CAS: 57-11-4)?

Octadecanoic acid (CAS: 57-11-4) is used in pharmaceuticals as an excipient for tablets and topical formulations. In industry, it serves as a lubricant and plasticizer in manufacturing. In food, it acts as an emulsifier in margarine and shortenings, enhancing texture. It is also employed in cosmetics for creams and lotions. Additionally, it functions as a model compound in research for studying lipid metabolism and material science. Its applications span multiple fields due to its chemical stability and functional versatility.

Is octadecanoic acid (CAS: 57-11-4) safe?

Octadecanoic acid (CAS: 57-11-4) is generally safe when used within regulated limits. It is non-toxic in food-grade applications and considered safe for industrial use with proper handling. However, direct skin contact or inhalation may cause mild irritation. Safety protocols include using gloves and goggles when working with large quantities. It adheres to safety standards for cosmetics and pharmaceuticals, ensuring minimal risk when following guidelines.

How should octadecanoic acid (CAS: 57-11-4) be stored?

Octadecanoic acid (CAS: 57-11-4) should be stored in a cool, dry place (ideally below 25°C) and protected from light. Keep in airtight containers to prevent moisture absorption, which can lead to hydrolysis. Avoid high humidity to maintain stability. Store in a well-ventilated area away from heat sources. Proper storage ensures longevity and safety, preventing degradation or contamination.