Polycarbonate Hollow Sheet, commonly known as "Sun Sheet", is a hollow-structured engineering plastic sheet extruded from high-performance polycarbonate (PC) resin. Its core positioning is "the preferred choice for large-span lighting scenarios, balancing lightness and thermal insulation".

I. Core Definition & Material Properties
Base material: Food-grade/industrial-grade PC resin, free of BPA, complying with international safety standards such as FDA and CE.
Form: Hollow structure (common rectangular or honeycomb cavities), different from solid PC sheets (endurance sheets). Thickness typically ranges from 4mm to 20mm, with customizable multi-layer hollow designs.
Core physical properties: Density is only 1/3 of glass; impact resistance is over 100 times that of tempered glass. It is lighter than solid PC sheets and offers better sound and thermal insulation.

II. Key Core Advantages
Excellent Thermal Insulation: The hollow cavity structure forms a natural insulation layer. Its thermal conductivity is much lower than that of glass and solid PC sheets, reducing temperature transfer between indoor and outdoor spaces and saving energy consumption.
Strong Weather Resistance & UV Protection: Surface coated with UV-resistant layer, withstanding extreme temperatures from -40℃ to 120℃. It won’t yellow or age after long-term outdoor use, with a service life of 8-12 years.
High Light Transmittance & Lightweight: Transmittance reaches 80%-90% with soft light. It is lightweight—only 1/3 the weight of glass of the same area—making it suitable for large-span installations (e.g., greenhouses, large industrial workshop lighting roofs).
Easy Processing & Safety: Can be bent, cut, and thermoformed to fit curved structures. High toughness prevents shattering and splashing upon impact; no heavy equipment is needed for construction, ensuring high efficiency.

III. Common Specifications & Differentiating Features
Regular widths: 1.22m, 1.56m, 1.82m, 2.1m (maximum customizable width up to 3m); length can be cut on demand.
Structure types: Double-layer hollow, triple-layer hollow, honeycomb hollow (more layers mean better thermal and sound insulation).
Colors: Transparent, milky white, lake blue, etc. (transparent is the mainstream; colored versions offer both light-shielding and decorative effects).
Differences from similar sheets: Lighter and more thermally insulating than solid PC sheets but slightly less pressure-resistant, suitable for non-load-bearing scenarios. Safer and easier to install than glass, and more weather-resistant than acrylic sheets.

IV. Typical Application Scenarios (Brief)
Covers agriculture, construction, transportation and other fields, such as greenhouses, industrial workshop lighting roofs, canopies, pedestrian overpass shelters, etc. Detailed application scope has been listed previously, so it is not repeated here.

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