Overview
Waterborne boron nitride is a colloidal suspension of hexagonal boron nitride (h-BN) particles in water, stabilized by surfactants or other dispersing agents. Unlike traditional oil-based BN dispersions, it offers environmental and safety advantages due to its water-based formulation. This material retains the intrinsic properties of boron nitride, including high thermal conductivity (up to 400 W/m·K in-plane), electrical insulation, and chemical resistance. It is increasingly adopted in industries seeking to replace solvent-based systems with eco-friendly alternatives.
Physical and Chemical Properties
The dispersion typically contains 10-50% BN solids by weight, with particle sizes ranging from submicron to 10 microns. Its viscosity can be adjusted from fluid to paste-like consistency depending on application needs. Key characteristics include anisotropic thermal conductivity (higher in-plane), a low coefficient of friction (0.15-0.25), and stability in pH ranges of 5-9. The material is non-reactive with most acids and alkalis at room temperature, making it suitable for harsh environments.
Main Applications
In thermal management, waterborne BN is used as filler in thermal greases, gap pads, and phase change materials for electronics cooling. Its lubricity enables applications in release coatings for glass molding and high-temperature forming processes. The cosmetic industry utilizes its smooth texture and heat dissipation properties in makeup foundations and skincare products. Emerging uses include additive manufacturing, where it improves the thermal properties of 3D-printed components without compromising electrical insulation.
Safety and Storage
While the aqueous form reduces inhalation risks compared to dry BN powder, proper ventilation is still recommended during handling. Prolonged skin contact may cause mild irritation due to surfactant content. Storage requires protection from freezing (which can destabilize the dispersion) and evaporation (leading to increased viscosity). Containers should be kept tightly sealed and periodically mixed to prevent sedimentation. Shelf life is typically 6-12 months under proper conditions.
B2B Procurement Guide
When sourcing waterborne BN, key specifications include: solid content (wt%), average particle size (D50), viscosity, pH value, and presence of additives. Industrial-grade materials (20-50% BN) are common for coatings, while high-purity grades (>99% BN) are used in electronics. Suppliers should provide technical data sheets with rheological properties and stability test results. Bulk purchases (200kg+ drums) typically offer 15-30% cost savings compared to small-quantity packaging. Consider regional suppliers to minimize transportation costs for this heavy material.
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