Phenolic compound duct phenolic foam middle layer, inner and outer layers of embossed foil composite. Phenolic resin is the world’s first industrial plastic products, and phenolic foam is the most successful in recent decades has just developed varieties. Phenolic foam is called “heat of the King”, applied to missiles and rockets early head of insulation, it is in the United States, Britain, Japan and some other developed countries has become the fastest growing in the development of plastic varieties. Phenolic foam material with good flame retardant properties, thermal conductivity, sound absorption performance, long service life. Since the phenolic foam material having the above excellent characteristics, so in all aspects of the national economy has been widely used, such as central air-conditioning duct, hot and cold pipes, clean factories, shopping malls, lightweight quick rooms, cold storage, refrigerated trucks, aircraft, ships, hotels and entertainment boxes and so on need to use fire, light, heat, noise, clean, place damp material.