COMPOSITE POLYCARBONATE ROOFING SHEETS
This type of roofing is made from fiber-reinforced composite plastics. The resin can be unsaturated polyester or vinyl ester, while the fibers are typically glass, carbon, or woven cloth. The light transmittance of composite roofing sheets ranges from 75% (frosted white) to 85% (clear white). Heat transmittance for clear white sheets ranges from 50% to 65%.
1. Core Components
— Mineral fibers: Glass fibers, carbon fibers, ceramic fibers
— Heat-resistant synthetic fibers: Kermel, Nomex, Kynol, Apyeil
— Other less common fibers: Plant-based fibers (wood, cellulose), mineral-based fibers (asbestos, silica), synthetic resin fibers (polyester, polyamide), metal fibers (steel, copper, aluminum)
2. Composition and Structure
Generally, each composite material consists of one or more dispersed phases distributed in a single continuous phase. The continuous phase is called the matrix, which usually acts as a binder for the dispersed phases. The dispersed phase, known as the reinforcement, is mixed into the matrix to enhance mechanical properties, adhesion, wear resistance, and scratch resistance.
In glass fiber reinforced plastics (FRP), the resin acts as a binder, and the glass fibers act as the reinforcement. Therefore, FRP has higher mechanical properties (compression, bending, tension) than any other type of plastic without fiber reinforcement (such as PVC, PP, PE, ABS). Due to these superior mechanical properties, FRP products have been widely applied in various industries and civil engineering.
3. Manufacturing Technology
— Contact molding
— Diaphragm molding
— Resin transfer molding
— Compression molding
— Winding
— Pulltrusion
4. Composite Material Products
• Rocket engine casings
• Missile, aircraft, and spacecraft hulls
• High-pressure vessels
• Three-layer high-grade composite fuel and oil pipelines (using Russian wet winding technology and pipeline production standards)
• Clean water, raw water, and source water composite pipelines (also known as glass fiber reinforced plastic pipes)
• Composite wastewater and chemical pipelines
• Irrigation pipes, water supply pipes for saline or acidic areas
• Covers for chemical tanks, tabletops, interior decoration, composite panels
• High-rise building garbage chute systems
• Electrical insulation, polymer ceramics, silicon ceramics, epoxy ceramics, various types of ceramic chains, supports, insulators, and bridges in electrical equipment, lightning protection, and fuses
• Tires for cars, motorcycles, and bicycles
• Composite boat hulls
• Cargo containers, public trash cans
• Childrens toys
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