Triple pressed

Panning and pressing is no longer used because of high labor costs, but it gave us the terms single-pressed, double-pressed, and triple-pressed stearic acid. These terms are widely used to denote the quaUty of stearic acid. These commercial "stearic" acids are actually mixtures of palmitic acid and stearic acid. 

Double press third pass>. Triple press (Stearic acid) (Stearic acid)... 

The unsaturation, as determined by the iodine value (IV), decreases from an IV of 10.0 for a single press to an IV of 1.0 for a triple press stearic acid grade. 

One of the traditional raw materials used for the production of stearic acid is taUow, and very often, consumers or customers will ask for products equivalent to stearic acid from tallow. Single, double, and triple pressed stearic acids from pahn oil are in fact produced via distillation processes, but similar terminologies were used to indicate their similar characteristics. Besides their fight color, fatty acids derived from palm products have a low content of unsaponifiables, indicating excellent purity. 

Lately, purely for aesthetic reasons, transparent and translucent soaps are gaining popularity, especially in South America. Stearic acid and triple pressed stearic acids can be used to produce soaps having good transparency. High palmitic acid content, however, appears to reduce transparency (130). The crystals of transparent/ translucent soaps based on palm kernel oil and pahn fatty acids are found to be in the p form (131). 

Grade Saponified, distilled, single-pressed, double-pressed, triple-pressed, USP, FCC, 90% stearic with low oleic, grade free from chick edema factor, 99.8% pure. 

Edenor ST-1. [Henkel Canada] Stearic acid, triple pressed intermediate. 

Hystrene 5016NF-FG Triple Pressed Stearic (Stearic Acid) 57-11-4... 

Although a large number of fatty acids are commercially available, the only one that is used to any extent as a lubricant for rPVC is stearic acid. The most common stearic acid used is the so-called triple pressed grade, which is a blend of palmitic (carbon chain length of 16) and stearic (chain length of 18) acids. It is a good external lubricant with a balance of some internal lubricating properties. Its major drawback is its volatility. 

Chem. Descrip. Triple pressed stearic acid CAS 57-11-4 EINECS/ELINCS 200-313-4... 

Chem. Descrip. high purity mixture of saturated fatty acids (triple pressed grade) Uses Dispersing agent, accelerator activator in rubber compounds Features Exc. color low iodine value ideal for applications requiring exc. heat, color stability... 

---