Water-repellent MinWool-1200® Preformed pipe is a factory "v-grooved" mineral wool board formed to specific pipe sizes and provided in half-cylinder sections with a variety of facing options. All mineral wool insulation is made from basalt, a volcanic rock, and bound with a thermosetting resin. Advanced manufacturing technology ensures that our mineral wool products have consistent product quality, with high fiber-density and low shot-content, for excellent performance in thermal control and fire resistance applications.