Onyx Elite® 339 has a soft white color and good air release designed for solid surface. It is an Alumina Trihydrate (ATH) with an average median particle size of 16 microns.

Onyx Elite® 339 is a high-purity, organic free Alumina Trihydrate designed to provide the translucency, depth of pattern and soft white color that are so important to the cast polymer industry. The product is designed to have a unique particle size dist ibution that provides an optimal combination of viscosity and air release for cast polymer processing. Control of the coarse fraction top size with a large fine fraction affords rapid dispersion in resin, excellent mold flow and wet-out characteristics that result in minimal porosity, uniformity of pigmentation and excellent reinforcement throughout the fabricated part. Onyx Elite® 339 is a color controlled, high purity, low surface area, medium particle size flame retardant and smoke suppressant material.