Overview
Barium stearate is a metallic soap derived from stearic acid and barium salts, primarily used as a heat stabilizer and lubricant in industrial applications. Its unique properties make it indispensable in polymer processing, particularly for PVC, where it prevents thermal degradation during molding and extrusion. As a cost-effective additive, it also functions as a water repellent and mold-release agent. Its compatibility with other stabilizers and fillers enhances its utility in composite materials, ensuring smooth processing and extended product lifespan.
Physical and Chemical Properties
Barium stearate appears as a fine white powder with a waxy texture and mild fatty odor. It is chemically stable under normal conditions but decomposes at high temperatures, releasing barium oxide and stearic acid. Its insolubility in water makes it suitable for moisture-resistant applications. The compound’s low melting point (160-170°C) allows it to melt and disperse evenly in polymer matrices, providing uniform lubrication. Its density of 1.145 g/cm³ and molecular weight of 704.27 g/mol are standard for metallic soaps, balancing efficacy with ease of handling.
Main Applications
In the plastics industry, barium stearate is a key stabilizer for PVC, preventing discoloration and brittleness during thermal processing. It is also used in rubber compounding to improve flow properties and reduce friction between polymer chains. Coatings and inks benefit from its water-repellent and anti-caking properties. Additionally, it serves as a mold-release agent in die-casting and a flatting agent in paints. Its versatility extends to niche uses like paper waterproofing and crayon manufacturing.
Safety and Storage
Barium stearate poses moderate health risks, requiring proper handling to avoid inhalation or skin contact. Use PPE such as gloves and masks, and ensure adequate ventilation in workspaces. Ingestion or prolonged exposure may lead to barium poisoning, necessitating immediate medical attention. Store in sealed containers away from moisture, acids, and oxidizing agents to prevent degradation. Shelf life typically exceeds two years under recommended conditions (cool, dry, and below 25°C).
B2B Procurement Guide
When sourcing barium stearate, prioritize suppliers with ISO or REACH certifications to ensure quality and regulatory compliance. Key specifications to verify include purity (≥98%), moisture content (<0.5%), and particle size (200-300 mesh for optimal dispersion). Bulk purchases (1-ton pallets) often reduce costs by 10-15%. Request SDS and batch analysis reports, and consider regional logistics to minimize lead times. Spot prices fluctuate with barium carbonate market trends, so monitor raw material indices for optimal timing.
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