Overview
Polycarbonate multiwall sheets are engineered plastic panels with a hollow, multi-chamber design that provides structural strength while allowing light transmission. They are commonly referred to as 'sunshine panels' in China due to their widespread use in daylighting applications. These sheets combine the durability of polycarbonate with the thermal efficiency of air-filled chambers. First adopted in Europe for agricultural greenhouses, the technology expanded to Asia in the 1990s. Modern versions incorporate co-extruded UV protection layers that extend service life to 10-15 years outdoors. The interlocking 'snap-on' edge design (插接式) allows for quick installation without specialized tools.
Product Features
The key advantage of multiwall polycarbonate is its exceptional strength-to-weight ratio – it weighs 1/6 of glass while offering comparable light transmission (up to 82%). The air pockets between wall layers create thermal insulation, with U-values as low as 1.0 W/m²K for energy-efficient buildings. Advanced versions feature anti-condensation coatings and customizable light diffusion properties. Unlike acrylic sheets, polycarbonate maintains flexibility in cold temperatures (-40°C to +120°C operational range) and meets Class B1 fire resistance standards. The material is also recyclable under ISO 15270 standards.
Main Uses
In industrial settings, these panels serve as roofing for factories, warehouses, and parking structures where natural lighting reduces energy costs. The agricultural sector uses them for greenhouse covers that optimize light diffusion while preventing plant sunburn. Architectural applications include atrium roofs, balcony enclosures, and soundproof barriers along highways. Recent innovations allow for curved installations in stadiums and public transportation shelters. Some manufacturers offer colored or patterned versions for decorative facades.
Culture and Development
The technology originated from aerospace-grade polycarbonate developed in the 1970s. China's construction boom in the 2000s drove mass adoption, with local production now accounting for 60% of global output. Modern manufacturing uses co-extrusion techniques to bond UV protection layers directly to the base material. Industry standards like GB/T 24138-2009 (China) and EN 1013-1 (Europe) govern quality parameters. Recent trends include photovoltaic-integrated panels and antibacterial coatings for healthcare facilities. The market is projected to grow at 6.8% CAGR through 2028.
B2B Procurement Guide
Industrial buyers should specify: 1) Panel thickness (4mm-16mm), 2) UV coating side (single/double), 3) Light transmission percentage, and 4) Fire rating certification. For large projects, request samples to test weatherability and structural load capacity. Reliable manufacturers provide 10-year warranties against yellowing and brittleness. Bulk orders (500+ sqm) typically qualify for 8-15% discounts. Sea freight is most cost-effective for international shipments, but panels must be packed vertically to prevent deformation.
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