Zinc Stearate in the Plastics Industry: Improving Processability and Stability

Due to its excellent binding and emulsifying properties, zinc stearate is widely used in cosmetics and personal care products. It serves as a bulking agent in powders, preventing clumping and providing a smooth texture. Zinc stearate is also utilized as a thickening agent in creams, lotions, and makeup products, enhancing their stability and spreadability.

In the plastics industry, zinc stearate finds wide use as a lubricant, heat stabilizer, and anti-blocking agent. It improves the processability of plastic materials, reduces extrusion pressure, and prevents surface defects. Additionally, it acts as a heat stabilizer, protecting the plastic from degradation during high-temperature processing. Zinc stearate is particularly beneficial in the production of PVC, polyolefins, and other thermoplastics.

Zinc stearate has several notable physical properties. It is a fine, fluffy powder with a density of around 1.1-1.2 g/cm3. It is insoluble in water but dissolves in most organic solvents. The melting point of zinc stearate is approximately 120-130°C, and it decomposes upon further heating. These physical properties make zinc stearate suitable for various processing techniques and applications.

Zinc stearate also plays a significant role in the pharmaceutical industry. It is commonly used as a glidant and lubricant in tablet manufacturing. Zinc stearate facilitates the flow of powdered ingredients, ensuring uniform tablet weight and preventing sticking to the machinery. Moreover, it enhances the dissolution rate of tablets, improving their bioavailability.