SAFETY GLASS

Evening Star, Issue 21881, 19 November 1934, Page 15

SAFETY GLASS

HOW IT IS MADE Few motorists know the way that safety glass, an important adjunct m modern motoring, is made. Briefly, the principle of safety glass construction is the bonding of two pieces of glass, under heat and liquid pressure, to an interposed sheet of transparent plastic. Under impact, one or both pieces of glass may crack or break, but the broken pieces adhere to the centre sheet of plastic. Early problems that confronted the makers of safety glass, such ns discolourisation alter a period of exposure to the sunlight and elements, are believed to have been solved. Organised research and development in the salety glass industry in the past few years have not only improved the quality and stability of the glass and plastic, but bonding agents have been developed so that uniform and dependable adhesions are produced, which increase the permanence of the finished product. Several elements have entered into the perfection of safety glass so that it will withstand the yellowing effect of sunlight. The very construction of the glass itself retards transmission of the discolouring rays of the sun, and the plastic is also highly resistant to the action of such rays.

Safety glass engineers also point out that the problem of separation from seepage of moisture has been solved by sealing the glass at the four edges with a weatherproof sealing compound to keep out every trace of dampness or moisture. There is : no reason why safety glass should not last the life of the ear, barring replacements due to accidents.