Does the trade name stearic acid mean pure C18?
Acid value measures the mixed fatty acid system as a whole. C16/C18 composition and solidification behavior may differ under the same grade name.
Relate lubrication to composition and solidification
Check composition and the solidification-point method, then compare mixing load and release in the same formulation. Keep the composition with the validated performance range for future purchases.
Why can grades of equal acid value lubricate differently?
Compare chain-length distribution, melting behaviour and exudation in the actual formulation. Rubber activation systems: Fix zinc oxide and curatives. Compare scorch, cure speed and blooming. Lubrication in plastics processing: Observe fusion, surface exudation and finished-part appearance.
Checking Fatty acid composition and Acid value
Fatty acid composition (% by mass or GC area %): Report C18 and C16 fractions and the reporting basis. Acid value (mg KOH/g): Use the same method and distinguish free fatty acids from soap salts. Solidification or dropping point (°C): Specify the method used. Different thermal properties are not interchangeable.
What to record
- Fatty acid composition
- Acid value
- Solidification point
- Mixing load
- Release performance
Technical references
Products and processes
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