Bodytinted glass

Body-tinted glasses have a uniform through colour of grey, bronze, green, blue, pink or amber. They reduce both the transmitted heat and light compared to equivalent clear float glass, as illustrated in Figure 7.18. They function by absorbing some of the incident solar radiation, causing the glass to warm. The glass then dissipates this absorbed heat both towards the inside and outside of the building, but owing to the greater movement of air externally, a greater proportion

Fig. 7.16 Glazing and detail - Swiss Re Building, London. Architects: Foster and Partners. Photographs: Arthur Lyons

is expelled. Thus in double-glazed units, the body-tinted glass must form the outer pane. Additional environmental control can be achieved by the use of low-emissivity glass for the inner pane, when a proportion of the heat re-radiated inwards from the body-tinted glass is reflected back out again by the low-emissivity coating.

Body-tinted glasses may be toughened or laminated for use in hazardous areas. The degree of solar control offered by body-tinted glass is categorised as low to medium, being dependent upon both the thickness and colour of the product.

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