RCD Corporation - Manufacturer of sealant and adhesive products, including mastics, for the HVAC industry. Our products provide energy efficient homes, apartments, offices, schools, hospitals, commercial and industrial buildings by preventing heat gain or heat loss by sealing leaks, gaps, or intrusions in conditioned spaces. Typical residential air ducts leak over 5% of their conditioned air. What’s even worse - commercial and institutional buildings leak over 10% of their conditioned air! RCD Mastics are carefully formulated to provide permanent, air tight, flexible, and weather resistant repairs and installations on air ducts, thermal insulation, and in conditioned spaces.