Overview
Zinc borate is an inorganic compound widely recognized for its flame-retardant properties in industrial applications. As a multi-functional additive, it serves as both a flame retardant and smoke suppressant while exhibiting low toxicity compared to halogenated alternatives. The compound exists in several hydrated forms, with 2ZnO·3B2O3·3.5H2O being the most commercially significant. Its effectiveness stems from its ability to release water molecules at high temperatures while forming a protective glassy layer that insulates the underlying material.
Physical and Chemical Properties
Zinc borate appears as a fine, free-flowing powder with a bulk density of approximately 0.5-0.7 g/cm³. Its thermal stability allows processing in most polymers without decomposition below 290°C, making it suitable for engineering plastics. The material demonstrates excellent UV stability and electrical insulation properties. When heated above 300°C, it undergoes endothermic decomposition, absorbing heat while releasing water vapor that dilutes combustible gases. The residual boric oxide forms a vitreous layer that inhibits oxygen diffusion.
Main Applications
In PVC applications, zinc borate synergizes with antimony trioxide, allowing 30-50% reduction in antimony usage while improving smoke suppression. It's particularly effective in wire and cable formulations where low smoke generation is critical. The compound also finds use in polyolefins, nylons, and elastomers. Beyond plastics, it serves as a wood preservative and flame retardant for textiles. Recent developments include its application in intumescent coatings and as a ceramic flux in specialty glasses.
Safety and Storage
While classified as non-hazardous under GHS, zinc borate powder requires careful handling to avoid dust inhalation. Facilities should implement local exhaust ventilation and provide NIOSH-approved dust masks for workers. Store in original packaging away from strong acids and oxidizers. Maintain relative humidity below 65% to prevent caking. Bulk storage silos should incorporate vibration systems to prevent bridging. The material is stable under normal conditions but may decompose if contaminated with organic substances during prolonged storage.
B2B Procurement Guide
When sourcing zinc borate, specify the desired particle size distribution (typically 2-10 μm for polymer applications) and loss on ignition (LOI) values (should be consistent with claimed hydrate form). Request certificates of analysis for lead and cadmium content if supplying to sensitive markets. For large-volume procurement, consider suppliers with ISO 9001-certified production facilities. Just-in-time delivery is preferable to minimize storage costs. Evaluate suppliers based on their ability to provide technical support for formulation optimization, especially when replacing traditional flame retardant systems.
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