Embossed Pattern Glass

A wide range of 3, 4, 6, 8 and 10 mm patterned glass is commercially available, offering a range of obscuration factors depending upon the depth and design of the pattern as illustrated in Figure 7.6. The classification of obscuration factors differs between manufacturers with 1 (lowest) to 5 (highest) for Pilkington and 1 (highest) to 10 (lowest) for Saint Gobain. The degree of privacy afforded by the various glasses is not only dependent upon the pattern but also upon the relative lighting levels on either side and the proximity of any object to the glass. The maximum stock sheet size is 3300 X 1880 mm.

Patterned glass is manufactured to BS EN 572-5: 2004, from a ribbon of molten cast glass which is passed through a pair of rollers, one of which is embossed. Certain strong patterns, such as Cotswold or reeded, require client choice of orientation, whereas the more flowing designs may need appropriate

Fig. 7.7 Screen printed glass

matching. Patterned glasses may be toughened, laminated or incorporated into double-glazing units for thermal, acoustic or safety considerations; a limited range is available in bronze tinted glass. Wired patterned glass (BS EN 572-6: 2004) is available with a 12.5 or 25 mm square mesh.

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