Stearic Acid

The Core Functions of Stearic Acid in PVC :

Lubrication : In PVC, it primarily acts as both an internal and external lubricant, improving melt flow, reducing material viscosity, preventing defects caused by sticking in the machine, and providing good mold release.
Thermal Stability : Although stearic acid itself is a fatty acid, it is the basis for the manufacture of stearates (such as calcium stearate, zinc stearate, and lead stearate). Adding stearic acid alone provides a certain degree of initial thermal stability.
Improved Appearance : It improves the surface gloss of PVC pipes, sheets, profiles, and films, and reduces cracks and silver streaks.

Application Precautions:

Dosage: The amount of stearic acid should not be excessive. Generally, it is 0.2-0.5 PHR in rigid PVC processing. Excessive amounts will shorten the induction period, leading to decreased melt strength, reduced hardness, and surface blooming.
Synergistic Use : It is usually used in combination with paraffin wax (such as PE wax) to exert its powerful composite lubrication effect (stearic acid for primary lubrication and internal lubrication; paraffin wax for auxiliary lubrication and external lubrication).
Formula Compatibility : In transparent product formulations, the dosage needs to be carefully adjusted to avoid affecting transparency.

Derivative Products (Stearates):

Its derivative products, such as calcium stearate (lubrication and synergy in calcium-zinc stabilizer systems), zinc stearate (inhibiting initial discoloration), and lead stearate, are often used in PVC formulations. They synergistically provide both thermal stability and lubrication.

Packaging, Storage and Transportation

• Packaging: 25KG/bag
• Storage and Transportation: Keep away from moisture; do not store or transport together with environmentally friendly products