... sizes, positive in buoyancy, natural in color.2. Plastic media balls can be used in trickle towers, degassing towers, wet ... filtering, moulding and calcining. The product has uniform granule, red and brown appearance, flinty and porous surface, interlaced with holes ... oil refinery. Physical properties:1. Appearance: spherical, surface with red brown, porous2. Grain diameter: 0.5 - 32mm3. Sight density ...