Corotherm Flat 4mm Polycarbonate Security Glazing Sheet 1220 x 2440mm Features Very high impact resistance. Much safer than glass. Flexible. High light transmission. UV resistant. Suitable for interior and exterior use. Class 1 BS476 Part 7 fire rating. Material Uses Primary Glazing. Secondary Glazing. Areas where security is vital. Whenever Vandalism may be possible. Screen Guards and Visors. Key Properties Ideal for a wide variety of applications, qualities include: Clearly transparent: maximises light transmission, up to 90%. Unbeatable impact resistance: much safer than glass, with an impact strength up to 200 times greater. Economy: through resistance to breakage against vandalism. Flexibility: flexible enough to be cold bent on site for curved applications. Durability: offers excellent resistance to the weather and atmospheric conditions. Excellent outdoor performance: suitable for interior and exterior use. UV Stabilised. Good workability: cutting and drilling the material are straightforward procedures requiring only the most basic of tools. The Corotherm range by Ariel comes with a 10 Year Guarantee.