Abstract
Welded and unwelded panels of perfluoroalkoxy sheet have been exposed to 70% nitric acid, 98% sulphuric acid and 50% sodium hydroxide in such a manner that the panels were subjected to both total immersion and vapour phase conditions. Tensile and flexural test pieces were subjected to total immersion at the same time. Exposure periods were for three months at 40°C and for 28 days at 80°C. Deliberately strained specimens were totally immersed in 98% sulphuric acid and 50% sodium hydroxide for 28 days at 80°C.
After exposure, the panels were examined visually and under a scanning microscope (SEM) for any signs of chemical attack or cracking. The tensile and flexural test pieces were tested after exposure to determine whether there had been any adverse effects on properties.
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