Zinc Oxide for Rubber Soles
Overview
Zinc oxide (ZnO) is an inorganic compound widely used as a vulcanization activator in rubber sole production. It accelerates sulfur cross-linking during vulcanization, improving the rubber's mechanical strength and heat resistance. In footwear manufacturing, ZnO ensures soles maintain elasticity under repeated stress while resisting abrasion. Its UV-blocking properties also prevent rubber degradation from sunlight exposure.
Physical and Chemical Properties
Zinc oxide appears as a fine white powder with a high melting point (~1975°C) and density (5.6 g/cm³). It is chemically stable but reacts with acids to form zinc salts. As a semiconductor, ZnO exhibits piezoelectric properties, making it useful in specialized rubber composites. Its insolubility in water ensures longevity in wet conditions, critical for shoe soles.
Main Applications
In rubber soles, ZnO primarily acts as a vulcanization activator, reducing curing time by 20–30%. It also enhances tensile strength and wear resistance. Secondary uses include UV protection in outdoor footwear and antimicrobial properties in sports shoes. High-purity ZnO (≥99%) is preferred for premium products due to fewer impurities affecting rubber clarity.
Safety and Storage
ZnO powder requires handling with NIOSH-approved dust masks to prevent respiratory irritation. Storage in moisture-proof containers is essential to avoid clumping. Though non-toxic, bulk storage areas should be well-ventilated. Spills can be cleaned with wet methods to minimize airborne particles.
B2B Procurement Guide
Bulk buyers should verify suppliers' ISO 9001 certifications and request batch-specific purity analysis. Technical-grade ZnO (99% pure) balances cost and performance for most sole applications. Consider contract pricing for orders above 10 tons. Southeast Asian suppliers often offer competitive rates, but test samples for heavy metal content compliance with REACH/ROHS.
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