Polyfab shade cloth has been designed to block out UV (ultraviolet) light to varying degrees depending on the range.
To determine the UV block out amount, a test is required by the Australian Standard AS4174 – Synthetic Shade Cloth. This test measures the amount of UV light (290 nm – 400 nm) that is blocked by the shade cloth. This is either via reflection or absorption.
UV block is the inverse of UV transmission e.g. 95% UV block = 5% UV transmission.