PC Multi-layer Polycarbonate Sunlight Panel

How to maintain a spring-like climate all year round in a PC polycarbonate sheet greenhouse?
We know that the healthy growth of flowers and vegetables in a greenhouse requires suitable temperatures. Generally, to achieve this, a certain amount of resources must be consumed to meet the temperature requirements. Many greenhouses are constructed using glass or other non-insulating materials, which can easily lead to significant heat loss inside the greenhouse. As a result, energy consumption costs constitute a large portion of the total operating expenses of a greenhouse. To address this issue, most modern greenhouses now opt for PC polycarbonate sheet greenhouses, which offer outstanding thermal insulation properties.
The light transmittance of PC polycarbonate sheets can reach up to about 90%. The UV coating on the surface of the sheets allows selective transmission of ultraviolet rays, providing ideal growing conditions for many flowers and making their colors more vibrant. The reason flowers in the greenhouse can bloom so magnificently is that they receive ample light while being protected from cold air. We know that one of the key factors in evaluating a greenhouse is its light transmittance, which is also a major reason for using PC polycarbonate sheets in greenhouse construction.

Characteristics of Polycarbonate Sheets:
(1) Light Transmittance: PC polycarbonate sheets can achieve up to about 89% light transmittance, comparable to glass. UV-coated sheets are less prone to yellowing, fogging, or reduced transparency when exposed to sunlight. After ten years, the light transmittance loss is only about 10%, whereas PVC loses 15–20%, and fiberglass loses about 12–20%.
(2) Impact Resistance: The impact strength is about 250–300 times that of ordinary glass, 30 times that of acrylic sheets of the same thickness, and 2–20 times that of tempered glass. It is often called "unbreakable glass" or "resonant steel."
(3) UV Protection: One side of the PC sheet is co-extruded with an anti-UV coating, while the other side has an anti-condensation treatment, combining UV resistance, thermal insulation, and anti-fogging functions. It blocks ultraviolet rays, making it ideal for protecting valuable artworks and exhibits from UV damage.
(4) Lightweight: With a density about half that of glass, it reduces costs related to transportation, handling, installation, and support structures.
(5) Flame Retardancy: According to the GB50222—95 standard, PC polycarbonate sheets are classified as flame-retardant (B1 grade). The self-ignition point of PC sheets is about 580°C, and they self-extinguish when removed from fire. They do not produce toxic gases when burning and do not contribute to the spread of flames.
(6) Bendability: They can be cold-bent on-site according to design drawings to form arches, semi-circular roofs, and windows. The minimum bending radius is about 175 times the sheet thickness, and they can also be heat-bent.
(7) Sound Insulation: PC polycarbonate sheets offer significant sound insulation, outperforming glass and acrylic sheets of the same thickness. Under the same thickness conditions, PC sheets improve sound insulation by about 5–9 dB compared to glass, making them the material of choice for highway sound barriers.
(8) Energy Efficiency: They keep interiors cool in summer and warm in winter. PC sheets have a lower thermal conductivity (K-value) than ordinary glass and other plastics, with thermal insulation efficiency 7–25% higher than that of glass. The thermal insulation of PC sheets can reach up to about 49%, significantly reducing heat loss, making them suitable for buildings with heating systems.
(9) Temperature Adaptability: PC sheets do not become brittle at -40°C and do not deform at 125°C. Their mechanical and physical properties remain largely unchanged even in harsh environments.
(10) Weather Resistance: PC polycarbonate sheets maintain stable physical properties within a temperature range of -40°C to 120°C. After 4,000 hours of artificial weathering tests, the yellowing index is only 2, and the light transmittance reduction is about 0.6%.
(11) Anti-Condensation: At an outdoor temperature of 0°C and an indoor temperature of 23°C, with indoor relative humidity below 80%, the inner surface of the material does not condense. Condensation flows along the surface of the sheet without dripping.
Yongxin PC structural sheet categories: General-purpose polycarbonate sheets (single-layer), single (double)-sided UV-resistant polycarbonate sheets, textured sheets, frosted sheets, transparent sound barrier panels, scratch-resistant sheets, corrugated sheets, general-purpose multi-wall sheets, single (double)-sided UV multi-wall sheets, crystal-clear sheets, anti-drip multi-wall sheets, easy-clean multi-wall sheets, anti-drip + easy-clean multi-wall sheets, multi-wall sheets, multi-layer multi-wall sheets, and PC tiles. PC structural sheet varieties: General-purpose single-layer sheets, impact-resistant sheets, transparent sound barrier panels, scratch-resistant sheets, and weather-resistant multi-wall sheets. The products are mainly used for canopies in various building spaces, daylighting greenhouses, highways, railway sound barriers, thermoformed skylights, and more.