MICRO™ (EFGS) Expanded Foam Glass Spheres are ideally suited for lightweight cement systems. This lightweight aggregate is made from recycled glass and provides a chemically resistant, low density, resistant to pressure a thermal insulation additive.  Also highly suited for use in construction - insulation, fireproofing and cement board. MICRO™ (EFGS) Expanded Foam Glass Spheres are tiny, white spherical particles of glass that have a hollow core and a thin wall. MICRO™ (EFGS) spheres improve the performance and quality of gypsum and drywall by reducing their weight and shrinkage, increasing their fire resistance and acoustic insulation, and preventing cracking and sagging.