HOLLOW ALUMINO-SILICATE GLASS MICROSPHERES, PARTICLES RETRIEVED FROM ASH RESIDUE RESULTING FROM THE BURNING OF COAL AT POWER STATIONS. SPH ERES ARE HARVESTED FROM THE ASH, HEATED, SCREENED SIEVED AND PACKED IN SACKS. PRODUCT IS USED AS A LIGHTWEIGHT FILLER WITH THERMAL AND SOUN D INSULATION PROPERTIES.

CLASSIFICATION IS DETERMINED BY THE INTERPRETATION OF GENERAL RULES 1 & 6 OF THE COMBINED NOMENCLATURE AND THE TERMS OF HEADING 262190