HeatShield’s Cerfractory technology is a hybrid (ceramic/refractory) coating that was developed in Europe over 30 years ago. HeatShield restores the integrity of your chimney’s flue to vent hazardous gases from your home. It eliminates the dangers in your chimney caused by gaps, cracks, and spalling for years to come. HeatShield is an eco-friendly product made from recycled and naturally occurring materials. It offers you a less costly alternative to rebuilding your chimney or the destructive removal of flue tiles before the chimney can be relined.