Stearic Acid
time:2012-10-01 16:05:41,count:0

Stearic Acid
Alias
Octadecanoic Acid
Category
Anionic surfactants-Carboxylate
CAS No.
57-11-4
Molecular Formula & Molecular Weight
Molecular Formula: C18H36O2
Molecular Weight: 284.48
Structural Formula
Properties
Appearance: white or pale yellow waxy solid.
Solubility: insoluble in water. soluble in ethanol, acetone, ether, chloroform, carbon tetrachloride, benzene, carbon disulfide.
Stability: stable.
Risk: irritation, irritation to skin, eye.
Animal toxicity[1]: mouse intravenous LD50: 23mg/Kg;
rabbit skin LD50: > 5000mg/Kg;
rat intravenous LD50: 21.5mg/Kg;
rat oral LDLo: 4640mg/Kg.
Ecology: May be hazardous to environment. Water body should be given special attention.
Biodegradability: biodegradable.
Characteristics: excellent lubricating, dispersing, emulsifying, cleansing abilities.
Ingredients description: commercial stearic acid is actually a mixture of stearic acid and palmitic acid, and contain a small amount of oleic acid.
Notes: be careful with using in children care products.
Synthesis
 
Quality standards & test methods
item
physical and chemical indexes
test methods
200 type
400 type
800 type
iodine value, g/100g,%, ≤
2.0
4.0
8.0
 
saponification value, mg/g
206-211
203-214
193-220
 
acid value, mg/g
205-210
202-212
192-218
 
Color*, Hazen, ≤
200
400
400
 
freezing point, ℃
54-57
≥54
≥52
 
moisture, ≤
0.20
0.20
0.30
 
inorganic acid, ≤
0.001
0.001
0.001
 
*: 25% ethanol solution.
Major Uses
Widely used in preparation of stearic acid ester. stearic acid ester can be used in personal care products, food, medicine.
Widely used in preparation of stearic acid salts. stearic acid salts can be used in personal care products, household cleaning products, fabricated metal products, plastic products.
Emulsifying agent, emollient in personal care products.
Vulcanization active agent, plasticizer, softening agent, emulsifying agent, release agent in synthesis and processing of rubber.
Heat stabilizer, lubricant in PVC plastic pipe, plates, profiles, film manufacturing. can prevent coking phenomenon in the process, and can prevent finished product discoloration caused by sulfides.
Use as medical accessories. eg: pharmaceutical, suppositories.
Lubricant in metal processing, machinery.
Use as dispersing agent, emulsifying agent.
Manufacturers
 
References
[1]:http://toxnet.nlm.nih.gov/:57-11-4
Update: 20131102(1);

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