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Resistance to SO2
(slate DIN 52206). 5 cm of surface are used 6 plates of 15 xs, of that one stays inalterable for reference. The 5 water plates submerge until constant weight and, next, they are introduced in a steam camera with a sulphided acid solution to 5% during 28 days, renews in the 14 days. The percentage variations of weight and the possible superficial alterations are observed.
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