Some Crazing Experiments on 'As-Cast' Acrylic to MIL-P-8184,
BRITISH AIRWAYS HOUNSLOW (ENGLAND)
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A first set of experiments was done to provide threshold crazing stress data on As-cast acrylic to MIL-P-8184 using a variety of fluids likely to be found in an airline environment. A second set of experiments was done to study the effect of water soluble cutting oils on acrylic. The oils were for potential use as corrosion inhibitors on a machine for sanding acrylics. A third and smallest experiment was to study the effect of de-icing fluid propylene glycol on cast acrylic following the discovery of de-icing fluid between the inner and outer panes on Trident passenger windows. The results of these experiments led to the measurement of a crazing stress of water and also cast doubt upon using threshold crazing stresses after 30 minutes testing. It would appear that some fluids do not reach their threshold in 30 minutes and need to be tested for a longer time.