From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
The merits of toughened glass over reinforced laminated glass for vehicle windows.
| Identifier | ExFiles\Box 178\2\ img165 | |
| Date | 26th February 1934 guessed | |
| PAGE FOUR. 8. REINFORCED GLASS. A letter from Park Wards was read in which they mentioned the difficulties they have with reinforced glass of the normal laminated pattern, i.e., a sheet of celluloid material sandwiched between two thin sheets of glass. Their difficulties chiefly centre round the liability of laminated glass to crack through changes in temperature, etc., which not only involves expense but not infrequently causes delay in delivery of new cars. They also referred to the fact that laminated glass is never quite clear and always reduces to some degree the driver's vision. They have suggested, therefore, that it might be worth while considering the use of the new 'Toughened' glass now made by the Triplex Co. and which is rapidly coming into general use over here. The glass is claimed by the makers to be as good, if not superior to the laminated glass which they think may eventually be entirely super-ceded by the new product. The toughened glass starts clearer than laminated glass and retains its clarity indefinitely. It has the approval of the Ministry of Transport and is available in all popular thicknesses, whilst it is slightly cheaper than the laminated product. It was reported that arrangements have already been made for toughened glass to be fitted to the next experimental body and the Sub-committee look forward with interest to a report at an early date of its advantages and disadvantages from the point of view of the user of the car. NOTE: Toughened glass is very strong and will resist considerable impact before breaking. When it does break it flies into a large number of very small pellets which have no sharp edges and consequently cannot cut. It is more consistent in thus disintegrating than laminated glass which sometimes flies about and causes injury to the driver or passengers. -----------o0o----------- | ||