ATH Aluminum Trihydrate (Silane Surface Treated)

Silane-treated ATH is a premium flame retardant filler where the particle surfaces have been functionalized with organosilane coupling agents, typically vinylsilane or methacrylsilane, to create a chemical bridge between the inorganic ATH surface and the organic resin matrix. This interfacial bonding dramatically improves the mechanical performance of the cured composite compared to untreated ATH, particularly in wet or humid environments where untreated fillers are prone to moisture-induced debonding.

The silane treatment reduces surface polarity, improving ATH dispersion in non-polar resin systems and reducing the viscosity increase associated with high loading levels. In UPR systems, silane-treated ATH can reduce compound viscosity by 30–50% compared to untreated grades at equal loading, enabling higher filler loadings or improved processing window.

Key improvements over untreated ATH include: flexural strength retention >90% after water immersion (vs. ~65% for untreated), improved impact resistance, better retention of electrical properties under humid conditions, and superior composite translucency. Recommended for applications requiring long-term outdoor durability, marine environments, electrical encapsulation, and wherever wet mechanical performance is critical.