Zinc stearate

Zinc stearate (CAS 557-05-1), also known as zinc distearate and approved as E366, is a metal soap produced from stearic acid and zinc. It functions primarily as a release agent, lubricant, and stabilizer across a broad range of manufacturing processes.

Procurement teams source it for both polymer processing and surface treatment applications where contamination-free mold release and flow improvement are critical. In rubber and plastics processing, it prevents adhesion to molds and processing equipment.

This compound improves the flow of compound during extrusion and calendering. PVC manufacturers use it as a heat stabilizer and internal lubricant, reducing degradation during high-temperature processing. This ensures material integrity during production.

In cosmetics and personal care, it functions as a binder and slip agent in pressed powders, foundations, and talc-based formulations. The construction and paper industries apply it as a hydrophobic surface treatment and anti-blocking agent.

It is frequently utilized in coatings, board production, and concrete release compounds. Zinc stearate is supplied as a fine white powder, with particle size and bulk density varying by grade to suit different processing requirements.

Standard commercial grades include technical, rubber, and cosmetic/personal care specifications. Food-additive grade is available under the E366 designation, often meeting FCC or USP quality standards for specific industrial applications.

Purity levels typically range from 98% upward, with moisture content and zinc assay among the key quality parameters buyers specify. These standards ensure the material meets Ph.Eur., BP, or EP requirements when necessary.

The material is also available in ACS grade for laboratory and high-precision industrial uses. This versatility makes it a staple chemical for manufacturers seeking reliable performance in stabilization and lubrication tasks.