Clear glazing for your garden projects
Multiwall polycarbonate 4 mm is a high-performance, clear glazing material engineered for residential greenhouses and patio covers. This Arla Multiclear BOX 2Wall sheet features a robust 800 g/m² mass, providing superior impact resistance and durability compared to standard lightweight alternatives.
Technical specifications
- Brand: Arla Plast
- Type: Multiclear BOX 2Wall
- Thickness: 4 mm
- Rib spacing: 6 mm
- Mass: 800 g/m²
- U-value: 3.9 W/m²*K
- Fire rating: B-s1
Built for real-world durability
Unlike many thinner sheets on the market, this 800 g/m² design offers genuine strength against weather fluctuations. It is engineered to handle rain, wind, and snow while maintaining excellent light transmission for your plants.
The multi-layer structure provides effective thermal insulation, helping to keep your greenhouse environment stable. It is a reliable choice for those who value long-term performance over flimsy, budget alternatives.
Installation and compatibility
This sheet is designed for easy handling and integrates well with standard aluminium profile systems. We recommend using sealing tapes to protect the channel ends from moisture. If you need more thermal efficiency for year-round growing, you might consider our 10 mm multiwall polycarbonate instead.
Important information
- 10-Year Warranty Covers discoloration caused by weather, as well as loss of impact resistance and light transmission.
- Cutting Tolerance The maximum allowable cutting deviation on the edges is 4 mm.
- Internal Structure The internal design (channels shape) of the sheets may vary based on stock levels, but the technical specs are identical. We never mix different structures in the same order to ensure a uniform look.
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- UV Protection & Installation Polycarbonate sheets must be installed with the UV-protected side facing up (facing the outside) for the protection to work. The UV side is clearly marked on the protective film.
- Handle with Care Handle the sheets carefully to prevent scratches and damage.
- Storage Store in a cool, dry place away from direct sunlight.
Use cases and compatibility
This sheet is ideal for small hobby greenhouses or vertical glazing applications where you need high light transmission and a material that is easy to handle.
If you require superior thermal insulation for year-round growing in colder climates, consider upgrading to a thicker 10 mm multiwall polycarbonate for improved energy efficiency.
Ensure your rafter spacing is compatible with 4 mm thickness to prevent excessive deflection under snow loads, and always seal the channels to maintain long-term clarity.
