Stearic acid (first syllable pronounced either steer or stair) is the saturated fatty acid with an 18 carbon chain and has the IUPAC name octadecanoic acid. It is a waxy solid, and its chemical formula is C18H36O2, or CH3(CH2)16COOH.
Esters of stearic acid with ethylene glycol, glycol stearate and glycol distearate, are used to produce a pearly effect in shampoos, soaps, and other cosmetic products. They are added to the product in molten form and allowed to crystallize under controlled conditions.
In fireworks, stearic acid is often used to coat metal powders such as aluminium and iron. This prevents oxidation, allowing compositions to be stored for a longer period of time.
It is used along with simple sugar or corn syrup as a hardener in candies.
It is used with zinc as zinc stearate as fanning powder for cards to deliver smooth fanning motion.
Stearic acid is one of most commonly used lubricants during injection molding and pressing of ceramic powders.
Stearic acid serves as an epilame (or barrier film) treatment, applied to precision mechanical components to modify the surface properties to reduce the spreading (or creep) of subsequently-applied lubricant films.
|
Index |
Standard |
Result
|
|
Iodine Value(g/100g) |
MAX2.0 |
1.95 |
|
Melting Point |
55≤x≤57 |
55.6 |
|
Color (APHA) |
≥25 |
28 |
|
Water (%) |
≤0.3 |
0.265 |
|
Acid Value(KOH/g) |
205-210 |
203.27 |
|
Saponification(KOH/g) |
203-214 |
205.3 |
Testing Result
|
Excellent Quality |
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