Glass sand Size Number Hong Kong label Particle size ... precision machined surface and size; 5, processing, surface smooth, with a special beauty, improve product value; 6, suitable for ... and wet blasting operations; 7, metal micro-cracks with a fine glass beads in the wet sand is easily displayed ... rust; 6, rubber mold of the dross; 7, with a reflective road marking; 8, arts and crafts decorative ...