ATH Aluminum Trihydrate (Fine Grade, d50 3µm)

This fine-grade aluminum trihydrate (ATH) features a median particle size of approximately 3 µm, offering improved mechanical properties and surface finish compared to standard grades. The finer particle distribution allows for more uniform dispersion throughout resin matrices, resulting in better impact strength retention, improved flexural properties, and a smoother molded surface with reduced stress concentration points.

Fine ATH is particularly valuable in RTM, vacuum infusion, and filament winding applications where filter effect from coarser grades can cause flow problems or fiber wet-out issues. The increased surface area (approximately 5–8 m²/g) enhances interfacial bonding with the resin matrix, contributing to better mechanical performance at equivalent loading levels.

Alternatively, fine ATH can be used at lower loading levels to achieve the same flame retardancy as coarser grades, thereby reducing the viscosity penalty. This grade is also preferred for cultured marble and solid surface applications where a smooth, void-free surface finish is paramount. Compatible with silane coupling agents for further performance enhancement in demanding structural applications.