| abstract |
The panel (200) comprises outer layers (216,218) made of fire-retardant material and seal coat to cover the outer surfaces of the outer layers. A three-dimensional decorative surface (215) is formed in the surface of any one of the outer layer by exposing to ultraviolet radiation. Independent claims are also included for the following: (1) preparation method of ultra lightweight heat and flame reistant composite panel; and (2) tip for ultrasonic radation-emitting assembly. |