Zinc Stearate

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 Zinc Stearate is a fine, white powder composed of zinc salts of stearic acid. It is a hydrophobic, non-toxic metal soap widely used as a lubricant, release agent, and stabilizer in plastics, rubber, paints, coatings, and personal care industries. Known for its excellent mold-release properties and compatibility with a range of polymers, Zinc Stearate offers thermal stability and processing efficiency across industrial applications.

Description

Zinc Stearate

Primary Uses

  1. Plastics Industry
  • Mold Release Agent: Prevents thermoplastics (e.g., PVC, ABS, PS) from sticking to molds.
  • Processing Aid: Improves flow and dispersion during extrusion and molding.
  • Stabilizer: Acts as a heat stabilizer in PVC formulations, often in combination with calcium stearate.
  1. Rubber Industry
  • Lubricant: Reduces internal friction during rubber processing and extrusion.
  • Release Agent: Facilitates demolding of rubber parts and profiles.
  • Activator: Enhances vulcanization when used with sulfur-based systems.
  1. Paints & Coatings
  • Matting Agent: Reduces gloss and improves texture in paints, lacquers, and powder coatings.
  • Dispersing Aid: Improves pigment dispersion and prevents caking in formulations.
  1. Cosmetics & Personal Care
  • Bulking & Opacifying Agent: Used in powders, creams, and lotions to provide smooth texture and opacity.
  • Water Repellency: Enhances moisture resistance in formulations. (Use restricted to cosmetic/personal care grades)

Secondary Uses

  1. Pharmaceuticals
  • Tablet Lubricant: Used as a dry lubricant in tablet manufacturing to prevent sticking. (Only when specified for pharmaceutical grade)
  1. Construction Materials
  • Hydrophobic Additive: Used in plasters and cement to increase water resistance and spreadability.
  1. Textile Industry
  • Softening Agent: Imparts softness and anti-static properties to fabrics in specialty treatments.
  1. Paper Industry
  • Surface Coating Aid: Enhances gloss and water resistance in certain coated papers and paperboard.
  1. Polishes and Wax Products
  • Thickener & Binder: Improves consistency and adhesion in furniture and automotive waxes/polishes.
KEY PRODUCT FEATURES

1. Basic Identification Attributes

  • Chemical Name (IUPAC): Zinc octadecanoate
  • Common/Trade Name: Zinc Stearate
  • CAS Number: 557-05-1
  • HS Code: 2915.70.00
  • Synonyms: Zinc distearate, stearic acid zinc salt

2. Physical & Chemical Properties

  • Physical State: Fine, hydrophobic powder
  • Color & Odor: White to off-white; slight fatty odor
  • Melting Point: >120 °C (softens)
  • Solubility: Insoluble in water and alcohol; soluble in aromatic hydrocarbons and chlorinated solvents
  • Density: ~1.1 g/cm³
  • pH (10% dispersion): ~7.5–8.5

3. Safety & Hazard Attributes

  • GHS Classification:
    • Not classified as hazardous
    • Dust may cause mild eye or respiratory irritation
  • Toxicity: Low toxicity; considered safe under normal handling conditions
  • Exposure Limits: No specific limits; general dust exposure limits apply

4. Storage & Handling Attributes

  • Storage Conditions: Store in a cool, dry, well-ventilated area away from moisture and oxidizers
  • Container Type: 25 kg bags or fiber drums with liners
  • Shelf Life: Up to 2 years under proper storage conditions
  • Handling Precautions: Minimize dust formation; use standard PPE

5. Regulatory & Compliance Attributes

  • Complies with REACH, OSHA, and TSCA regulations
  • Listed in international chemical inventories (EINECS, DSL, AICS, etc.)
  • Manufactured under ISO 9001 and ISO 14001 standards
  • GMP-compliant production when intended for cosmetic or pharmaceutical use
  • RoHS-compliant for electronics and plastics
  • Conforms to FDA and EU standards for indirect food contact (when applicable)

6. Environmental & Health Impact

  • Biodegradability: Biodegradable in the environment
  • Ecotoxicity: Low; not expected to be hazardous to aquatic life
  • Bioaccumulation: Negligible
SAFETY HANDLING PRECAUTIONS

Safety Handling Precautions

  • PPE Required: Gloves, goggles, dust mask if airborne particles are present
  • Handling Guidelines: Use local exhaust ventilation; prevent dust accumulation
  • Storage Measures: Keep sealed in original containers; avoid exposure to high humidity

First Aid Measures

  • Inhalation: Move to fresh air; seek medical help if respiratory symptoms persist
  • Skin Contact: Wash thoroughly with soap and water
  • Eye Contact: Rinse with water for at least 15 minutes
  • Ingestion: Not expected to be toxic; rinse mouth and consult a physician if large amounts are ingested

Firefighting Measures

  • Fire Hazards: Not flammable but combustible as a dust cloud
  • Extinguishing Media: Dry chemical, foam, CO₂, or water spray
  • Hazardous Combustion Products: May emit zinc oxide and carbon oxides