Zinc stearate

Zinc stearate

Zinc distearate; Octadecanoic acid zinc salt; Zinc dioctadecanoate; Stearic acid zinc salt

CAS 557-05-1

Chemical Formula C₃₆H₇₀O₄Zn

Molecular Weight 632.33 g/mol

Zinc stearate is a white, powdery substance commonly used as a lubricant, release agent, and anti-caking agent in various industries. It is widely utilized in plastics, rubber, cosmetics, and pharmaceuticals to improve texture, prevent sticking, and enhance processing efficiency.

Industrial Uses

1. Polymers & Resins

  • Lubricant: Zinc stearate reduces internal and external friction during plastic processing. It helps molten polymer flow smoothly through machinery during extrusion and molding, reducing wear on equipment and defects in finished products.
  • Dispersant: Helps evenly distribute pigments, fillers, or other additives, ensuring 
  • Mold release agent: Prevents rubber compounds from sticking to hot metal molds, ensuring clean, smooth surfaces and reducing mold maintenance.
  • Activator: Works with zinc oxide and stearic acid in vulcanization, improving the efficiency of sulfur cross-linking which enhances the elasticity and durability of rubber products.

2. Paints, Coatings & Adhesive 

  • Flatting agent: Creates a matte or satin appearance by scattering light on the paint surface. Ideal for interior wall paints or decorative finishes.
  • Pigment dispersant: Improves color uniformity and reduces pigment clumping, enhancing coating performance and aesthetics.
  • Anti-settling agent: Keeps solid particles suspended in the liquid phase, improving shelf life and reducing the need for re-mixing.

3. Personal Care

  • Slip agent: Provides a silky, smooth texture in pressed powders and foundations. Makes products feel soft and luxurious when applied.
  • Water repellency: Adds water resistance to makeup, sunscreens, and lotions, helping them stay effective longer.
  • Non-toxic and skin-friendly: Zinc stearate is a safe, inert compound, making it ideal for sensitive skin products like baby powders and medicated creams.

4. Pharmaceuticals

  • Tablet lubricant: Reduces friction during compression, allowing tablets to be ejected easily from molds.
  • Anti-adherent: Prevents powders from sticking to punches and dies, maintaining clean equipment and product uniformity.
  • Flow agent: Enhances powder flowability for consistent filling during tablet production.

5. Pulp & Paper Solutions

  • Gloss enhancer: When applied as a coating, it improves surface smoothness and shine, especially on glossy paper used for printing.
  • Anti-blocking agent: Prevents coated paper sheets from sticking to each other during storage or packaging.

6. Construction

  • Concrete form release: Acts as a barrier between wet concrete and mold surfaces, ensuring easy demolding and smooth finishes.
  • Hydrophobic agent: Makes concrete surfaces water-resistant, reducing water absorption and protecting against freeze-thaw damage.

7. Fabric Solutions

  • Softening agent: Applied during textile finishing to impart a soft hand feel to fabrics, especially cotton and blends.
  • Water resistance: Adds hydrophobicity to textiles used in rainwear, outdoor gear, and upholstery.
     

Specifications

Assay ≥ 98%
Appearance Fine, white, hydrophobic powder
Odor Slight fatty odor
Boiling Point Not applicable (decomposes before boiling)
Melting Point 118–125 °C
Density ~1.095 g/cm³ (at 20 °C)
Solubility Insoluble in water; soluble in hot aromatic and chlorinated hydrocarbons
Viscosity Not applicable (solid)
Flash Point >150 °C (closed cup, for dispersion)

FAQs

1. What is the current price of Zinc stearate in India?
The price Zinc stearate can vary based on factors such as purity, quantity, etc. For the most accurate and competitive pricing, please contact us at +91.6301 00 6301 directly for a customized quote tailored to your needs.

2. Where can I buy Zinc stearate in India?
You can purchase Zinc stearate from MULTICHEM, a leading exporter with a reputation for quality and reliability. We provide convenient options for bulk orders and direct shipments across global markets. For more details on how to place an order, please visit our website or contact our sales team.

3. What is the minimum order quantity (MOQ) for Zinc stearate?
Our minimum order quantity (MOQ) Zinc stearate is designed to cater to both small-scale and large-scale needs. The MOQ depends on the packing size of the product which could range from 25 kg to 250kg.

4. How can I ensure the quality of Zinc stearate supplied by Multichem ?                      
We adhere to stringent quality control processes to ensure that our products meet the highest standards of purity and effectiveness. They undergo rigorous testing and quality checks to guarantee that they comply with industry specifications. We provide a Certificate of Analysis (CoA) with every shipment to ensure transparency and quality assurance.