A revolution in glass Self-cleaning glass has been described as an impossible dream. Yet, following intensive research and development by Pilkington - the world's leading glass manufacturer - Pilkington Activ™ does just that. It's unique dual action uses the forces of nature to continually clean itself, giving you not only the practical benefit of less cleaning, but also clearer, better-looking windows. How Pilkington Activ™works The dual action process The secret of Pilkington Activ™ is its special coating, which works in two stages. Breaking down organic dirt Firstly, the coating reacts with ultra-violet (UV) rays from natural daylight to break down and disintergrate organic dirt (see figures 1 & 2). Organic dirt generally comes from living plants and animals, e.g. bird droppings or tree sap, while inorganic dirt comes from other, non-living sources e.g. cement or plaster. Washing dirt away The second part of the process happens when water hits the glass. Rain water runs down the glass to wash the loosened dirt (both organic and inorganic) away. Inorganic dirt will only be removed by water. Compared to with the conventional glass, the, the water dries very quickly, reducing unsightly streaks or marks (see figure 3).   Figure 1: Coating is activated by UV light After installation the special coating needs 5 to 7 days' exposure to daylight to activate fully. Figure 2: Organic dirt is broken down The coating breaks down organic dirt and by doing so, reduces the adherence of inorganic dirt. Figure 3: Rain washes dirt away Water droplets spread out to form a 'sheet', dirt particles on the surface are picked up by water and washed off the glass - a remarkable difference you can actually see.

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