1)fiberglass well-distributed, smooth surface 2)insulation, anti-high temperature , fireproofing 3)sound ... grayCharacter : 1)fiberglass well-distributed, smooth surface, uniform thickness, 2)insulation, anti-high temperature , fireproofing, heat-insulation and fire-resistant ... electrical equipment, machinery equipment lighting equipment 2)heat insulation in the heating device 3)heating and ventilating ...