Does clear polycarbonate block all UV?

Do not assume a universal 100% figure. Ask for spectral transmission data for the exact grade, thickness and wavelength range. “Clear” describes visible appearance, not a complete UV specification.

Is the removable protective film the UV layer?

No. The removable film protects the surface during transport and often marks the UV-protected face. The functional UV protection is part of the sheet construction; remove the transport film according to the installation instructions.

Can polycarbonate be installed with either side facing out?

Only when the supplier confirms two-sided UV protection. For one-sided sheet, the marked UV-protected face must point towards the sun.

Archives

Diagram showing ultraviolet rays absorbed at the UV-protected side of a clear polycarbonate sheet while visible light passes through

Does Polycarbonate Block UV? UV Filtering vs Weather Protection

Polycarbonate can filter a large share of ultraviolet radiation while still transmitting visible light, but that does not mean every polycarbonate…

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