Polycarbonate Greenhouse Covering Systems

For most Indian commercial greenhouses, Coxwell Spry Twinwall 8 mm in Opal White is the standard specification. The Opal tint provides full diffusion (no hotspots), the twin-wall structure provides a thermal break, and the UV co-extruded coating is designed to maintain PAR transmission throughout the product life. For maximum light transmission in research greenhouses or high-light crops, Clear tint is specified.

Polycarbonate is lighter (1.5–2 kg/m² vs 10–15 kg/m²), more impact resistant (250× glass), and provides better thermal insulation through its multi-wall cell structure. Unlike glass, polycarbonate twinwall diffuses incoming light — eliminating the hotspots that direct glass transmission creates. The main advantage of glass is marginally higher light transmission, but this is outweighed by the diffusion and thermal benefits of polycarbonate for most commercial horticulture.

All Coxwell polycarbonate panels have UV protection co-extruded into the surface layer — not coated on. This means the UV protection is integral to the material and cannot peel or wash off independently of the panel.

Coxwell Spry is available in 1,200 mm and 2,100 mm widths. The wider 2,100 mm format reduces the number of joints in the greenhouse structure, speeds installation, and creates a more uniform light environment. For curved greenhouse structures, 1,200 mm is easier to handle during installation.

Yes. Polycarbonate has 250× the impact resistance of glass. In typical Indian hailstorms, polycarbonate greenhouse panels will not break, crack, or deform. This is one of the primary reasons commercial nurseries specify polycarbonate over glass in hail-prone regions of India.

Spry is a twinwall (two-layer) sheet that provides light diffusion and thermal insulation — it is the primary greenhouse covering choice. Static is a single solid sheet with high clarity (up to 89% transmission) and no thermal insulation — it is used for greenhouse end-walls, side panels, and dividing partitions where maximum light and structural clarity are required alongside impact resistance.