Hollow Double Layer Polycarbonate Sheet

Updated: 2026-07-15

Overview

Hollow double layer polycarbonate sheets, often marketed as sunlight panels, are engineered thermoplastic panels with a multi-wall hollow structure. They combine the durability of polycarbonate with the insulating properties of air-filled chambers. These sheets are a preferred alternative to glass in construction due to their shatterproof nature and ease of installation. Initially developed for agricultural greenhouses, their applications have expanded to architectural glazing, industrial covers, and noise barriers. The panels are available in clear, tinted, or opaline finishes, catering to both functional and aesthetic requirements.

Structure and Working Principle

The panels consist of two parallel polycarbonate layers connected by vertical ribs, forming hollow channels. These channels trap air, providing thermal insulation and reducing heat transfer by up to 50% compared to single-layer sheets. The geometry also enhances rigidity, allowing spans of up to 2 meters without additional support. UV-resistant coatings are typically co-extruded on the outer surface to block 99% of harmful ultraviolet rays while maintaining 80-90% light transmission. The inner layer may include anti-condensation treatments to minimize dripping in humid environments.

Key Features

Impact resistance is a standout feature—these sheets withstand hail and heavy loads without cracking, earning them a safety glazing certification in many regions. Their lightweight nature (1/6 the weight of glass) simplifies transportation and reduces structural support costs. Temperature tolerance ranges from -40°C to 120°C, making them suitable for extreme climates. Fire-retardant grades comply with UL94 V-2 standards, slowing flame spread. Additionally, the material is recyclable under ISO 15270 standards, appealing to sustainable construction initiatives.

Application Areas

In agriculture, the panels optimize light diffusion for plant growth while reducing heat loss. Commercial buildings use them for atrium roofs, where their high light transmission lowers energy costs. Factories employ them for noise-reducing barriers and explosion-proof lighting covers. Retail spaces leverage their aesthetic versatility for curved facades and signage backings. Recent innovations include integrated photovoltaic versions for solar energy harvesting, expanding their role in green building projects.

Maintenance and Precautions

Clean panels with mild soap and water using soft cloths; avoid solvents like acetone that can craze the surface. Inspect seals annually, especially aluminum or EPDM gaskets, to prevent water pooling and algae growth. During installation, use UV-resistant sealing tapes on cut edges to maintain longevity. Allow for thermal expansion (3mm per linear meter per 10°C change) by leaving gaps in framing systems. Never drill near panel edges to prevent cracking.

B2B Procurement Guide

Bulk buyers should verify raw material sources—virgin polycarbonate granules from brands like Covestro or SABIC ensure consistent quality. Request test reports for UV stability (e.g., QUV 4000 hours) and impact resistance (IK ratings). For large projects, customized sizes (up to 2.1m width × 12m length) reduce waste. Compare MOQs: standard panels start at 100㎡, while specialty colors may require 500㎡. Logistics planning is critical—panels are typically shipped in wooden crates with protective film to prevent scratching.