ATH Aluminum Trihydrate (Ultrafine, d50 1µm)

Ultrafine ATH with a median particle size of approximately 1 µm represents the highest performance tier of aluminum trihydrate fillers. The sub-micron to near-micron particle dimensions confer exceptional mechanical reinforcement, outstanding surface quality, and the ability to achieve high FR loadings with manageable viscosity when surface treated.

The high surface area (typically 10–15 m²/g) provides maximum resin-filler contact and significantly enhances mechanical properties including tensile strength, flexural modulus, and impact resistance versus coarser grades. In transparent or translucent resin systems, ultrafine ATH's small particle size minimizes light scattering, preserving the optical clarity of clear casting resins, acrylic solid surface, and decorative laminates.

Ultrafine ATH is the filler of choice for high-end acrylic solid surface (Corian-type) products, premium cultured marble, and fire-rated transparent FRP panels. The small particle size also improves packing efficiency, allowing very high loadings (>200 phr) while remaining processable with appropriate dispersing agents. Surface treatment with silane or fatty acid is virtually mandatory at these loadings to manage viscosity and ensure processing feasibility.