Baoding Sinhai Sunboard Manufacturing Co., Ltd. manufactures Twinwall polycarbonate sheet, a two-layer extruded thermoplastic panel for roofing, glazing and daylighting applications. It is available in 3–12 mm thick and transmits 78% to 82% of light. A 50 µm co-extruded UV layer blocks 98% to 100% of the UV radiation. Sinhai has the certifications of ISO 9001:2015, CE, RoHS and UDEM. Each sheet is guarantyd for 10 years against yellowing or transparency loss.
Thermoplastic panels that have been made make up a twinwall polycarbonate sheet. It has two flat, parallel layers that are joined by long, internal ribs. Due to the air gap between the walls, the panel has a thermal U-value of 2.3–3.9 W/m²K, which is lower than single-glazed glass and higher than thermally efficient glass.
Glass and plastic don't have these three problems that happen in real life:
The panel is structurally rigid without adding extra weight because the flutes are spaced 6 mm apart on the inside.
| Property | Value |
|---|---|
| Thickness Options | 3 mm, 4 mm, 6 mm, 8 mm, 10 mm, 12 mm |
| Wall Structure | 2-layer twin wall with 6 mm flutes |
| Light Transmission (Clear) | 78%–82% |
| UV Blocking Rate | 98%–100% |
| UV Layer Thickness | 50–109 microns (co-extruded) |
| UV Layer Sides | 1 or 2 faces available |
| Thermal U-Value | 2.3–3.9 W/m²K (varies by thickness) |
| Impact Strength | 250× that of glass (ASTM D-3763) |
| Operating Temperature | −40°C to +120°C |
| Flame Rating | Class A (ASTM E84) |
| Warranty | 10 years |
| Certifications | ISO 9001:2015, CE, RoHS, UDEM |
New, fresh polycarbonate plastic is used to make sheets. Plywood panels made from imported SABIC or Bayer (Covestro) resin are also available for projects that need to be able to show where the raw materials came from.
Choices of standard colours:
Transparent, Bronze, Grey, Opal, Lake Blue, Amber, Dark Blue, Silver, Orange, Yellow, and Custom
ODM and OEM services let you use custom colours and film finishes.
Commercial Greenhouses
The panel's ability to keep heat in and let 78% to 82% of light through helps keep growing temperatures stable. All year long, plants do well with light that is spread out.
Roofs and industrial facades
The panel allows natural light into warehouses, factories, and public buildings without adding weight to the structure. It also meets safety standards for wind load and seismic activity.
With patios, pergolas, and canopies just for you
Support bars can be smaller because this item is thin. Heavy hail or snow won't break the building because it has an ASTM D-37633 rating of 250 glass impact strength.
Curtain walls, screens, swimming pool covers, sound barriers, and advertising light boxes are some of the other things that they can be used for.
While receiving twinwall polycarbonate sheet raw materials, during production, and after the final delivery, Sinhai inspects them. Important checks include:
Sinhai can manage both standard stock and project-specific needs:
Q: Are you wondering if the sheet will turn yellow or break after being in the sun for a long time?
A: Each panel has a 50-µm co-extruded UV layer that safeguards the inner plastic from breaking down by blocking 98% to 100% of UV rays. Sinhai offers a 10-year guarantee against yellowing and light failure.
Q: When installing, which side needs to be facing the sun?
A: Whichever side has the printed protective film (that shows the UV-protected side) must always face the sun. Switching the orientation will shorten the life of the panel.
Q: Why doesn't water or dust stay inside the hollow chambers?
A: To get rid of moisture while keeping out dust, bugs, and algae spores, use open anti-dust tape on the bottom profile. Complete the job by adding U-profiles and sealing the top with solid aluminium tape.
Q: Can a 4 mm sheet be used for roofing?
A: A 4 mm panel is good for small home projects and gardens that don't rely on heavy loads. Where there is a lot of wind or snow, 6 mm or 8 mm roofing material is usually the best choice. You can confirm the right thickness for your project by sending us the details of your work.
Q: During the installation, can I walk on the sheets?
A: Avoid walking on plastic plates directly. To spread the weight, put moving boards over at least three purlins. Regardless of the sheet's total impact grade, concentrated point loads can break it.
Q: What choices are there for raw materials?
A: A standard panel uses polycarbonate plastic that is 100% new. If you need project-specific material tracking, you can get imported SABIC or Bayer (Covestro) resin.
Do you have more questions about twinwall polycarbonate sheet? Send your project requirements or sample request to [email protected].
⭐⭐⭐⭐⭐ · August 12, 2026
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⭐⭐⭐⭐⭐ · July 25, 2026
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⭐⭐⭐⭐⭐ · June 18, 2026
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