Twin wall polycarbonate sheets are thermoplastic panels made of two parallel polycarbonate layers joined by vertical ribs inside. This structure makes enclosed air channels that keep heat in (U-values between 2.4 and 3.9 W/m²K depending on thickness) while letting as much light through as 82% of the time. These panels are 250 times stronger than glass when it comes to impact, which makes them a good choice for commercial greenhouses, industrial skylights, and home carports.
Each panel is made up of two flat outer skins that are joined together by vertical ribs inside. These ribs make hollow air ducts that run the whole length of the sheet. As a thermal buffer, these channels slow the transfer of heat between surfaces inside and outside. This is a real benefit when it comes to saving money on heating or cooling costs.
The material doesn't change shape when the temperature goes from -40 °C to +120 °C, so it can be used in both cold and hot places.
| Parameter | Details |
|---|---|
| Thickness | 3 mm – 12 mm |
| Light Transmission (clear) | Up to 82% |
| Impact Strength | 250× greater than glass; 30× greater than acrylic |
| Thermal Insulation (U-value) | 2.4 – 3.9 W/m²K (varies by thickness) |
| UV Protection Layer | 50 – 109 microns, co-extruded on 1 or 2 faces |
| Operating Temperature | −40 °C to +120 °C |
| Fire Rating | Self-extinguishing; Class B-s1, d0 (EN 13501-1) |
| Material | 100% virgin resin; SABIC / Covestro (Bayer) available |
| Colors | Transparent, Bronze, Grey, Opal, Lake Blue, Amber, Dark Blue, Silver, Orange, Yellow, or custom |
| MOQ | 500 m² |
| Lead Time | 7–15 working days after deposit |
| Payment Terms | T/T 30% deposit + 70% balance; L/C at sight |
| Certifications | ISO 9001:2015, CE, RoHS, UDEM, KOSHER |
| Price Terms | FOB / CIF |
Each panel is made with 100% brand-new polycarbonate plastic. For projects that need a premium resin source that can be tracked, SABIC or Covestro (Bayer) material is available.
The UV protection layer of Twin wall polycarbonate sheets is co-extruded right into the surface during production. It is not added as a separate layer that could peel or come off over time. It's 50 to 109 microns thick, so it blocks 99% of UV rays that are bad for you. This keeps the resin inside from turning yellow and breaking. This is backed by a 10-year guarantee from Sinhai against yellowing and light loss.
As part of quality control, resin purity is checked, grammage stability is checked, UV coating uniformity is measured with ultrasonic thickness gauges, accelerated weathering tests using Xenon-arc lamps to track the Yellowness Index are done, and ISO 6603 impact tests are done.
Commercial Agriculture
The filtered light that passes through greenhouse windows keeps crops from getting too hot, and the empty structure saves money on heating costs in the winter.
Buildings for businesses
The lightweight panel style is used in factory windows and smoke vent systems to keep natural light coming in while lowering the load on steel buildings' roofs.
Home Improvement Projects
A lot of people install patios, carports, pergolas, pool covers, and canopies. A fine-toothed circle saw is used to cut the sheets, and standard shapes and tools are used to put them together.
Using Other Tools
Panels like these are often used for sound barriers, corridor roofs, curtain walls, advertising light boxes, interior walls, and agricultural sheds.
Sinhai can do CNC cutting, bending, film finishing, and special-shaped cutting, as well as OEM and ODM orders. The team can make a custom specification if your project needs a panel width, colour, or thickness that isn't in the standard range.
Sinhai can handle both large orders and mixed container purchases thanks to its three production bases and more than 25 production lines that cover more than 50,000 m². Central Asian markets can get their goods in about seven days thanks to the Kashgar production base. Local warehouses in Tashkent and Dushanbe can cut lead times even more.
Logistics options for Twin wall polycarbonate sheets include shipping by sea, truck, or air, all of which are supported by teams that know how to clear customs and handle paperwork that crosses borders.
Q: Will the sheet turn yellow or break easily after being in the sun for a long time?
A: 99% of UV rays are blocked by the co-extruded UV layer, which protects the plastic from the inside out. Sinhai guarantees that their products will not yellow or lose light transmission for 10 years.
Q: Which side will be facing the sun while it's being set up?
A: It is important that the side with the protective film written on it faces the sun so that it stays safe from UV rays. Installing it backward will make it last a lot less time.
Q: What can I do to keep dust and water out of the hollow chambers?
A: Place anti-dust tape with a hole at the bottom end and solid tape on top. Then, use U-profiles to seal the ends. This setup keeps dust and bugs out while letting moisture escape.
Q: Is 4 mm thick enough for a roof?
A: For gardens and small do-it-yourself projects, 4 mm is fine. 6 mm or 8 mm is the right thickness for roofs that will be hit by wind, hail, or snow.
Q: Can the sheets be cut where they are?
A: Most thicknesses can be cut with a circular saw with fine teeth. For thinner panels, a multipurpose knife that is clean will do. A cleaner edge is made when you cut along the rib direction.
Q: How many fires can it hold?
A: The panels can put out fires on their own and are rated Class B-s1, d0 under EN 13501-1. This means they don't help the fire spread and don't make flaming droplets.
Do you have more questions about twin wall polycarbonate sheets? For quotes or samples, reach our team at [email protected].
⭐⭐⭐⭐⭐ · August 12, 2026
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