It is made of SMC AND FRP with durability against impact force. It is the best material which has special capabilities and can be used almost permanently.
It shows excellent durability even under severe environment. The temperature of roof surface reaches over 60 °C in the daytime of summer.
The temperature sometimes remains under zero for long time owing to snow in Winter. In this way , the roof is a part of a house which is surrounded by the severest conditions. The material of tile should be strong enough to endure this kind of severe environment.
Because special SMC AND FRP usually used for the body of high-glass cruiser or F1 machine is selected as material, its quality cannot be degraded as time passed. A "heat cycle test" where rapid change of temperature is repeated for long time, proved that it cannot be degraded almost permanently. In a leaping flame test , it showed and excellent anti-fire capability. It prevents a fire from spreading. Its surface is processed with special baking coating. Because it has excellent durability, it retains beautiful coating almost permanently.