Features: 1. Adopt the newest multi-layer co-extruding technology. 2. Unique honeycomb-like center which is mutually connected by hexahedral pillars. 3. Heat insulation and keep energy. 4. Anti-ultraviolet radiation, anti-aging. 5. High strength 6. Flame retardant of B1 material from the fire self-extinguishing. 7. Light weight, environmental and difficult to break. 8. Saving energy 9. Ten years warranty. 10. More durable. Usages: 1. agriculture greenhouse in cold climate region 2. roof material 3. plant in factory 4. stadium 5. long-span structures 6. industrial lighting system 7. warehouse roof 8. warehouse and museum lighting system and so on.