Diffusion of water vapour in polymer lining materials - Part 2 Rhepanol ORG (PIB)

In evaluation of the water vapour coefficient, the time depending permeatio n depth and the immobilized water during the absorption by Rhepanol ORG (PI B with black fillers) at 70 C is presented. The immobilized water content m ay be explained due to absorption on filler surfaces or in micropores. A ve ry small water vapour diffusion coefficient was found with Rheanol ORG. It is presumed that this is due to both a high content of fillers with high sp ecific surfaces, lamellar graphite and the very small diffusion coefficient of the unfilled PIB polymer comparable with vulcanized IIR rubber. It is t herefore expected that Rhepanol ORG should exhibit a longer practical servi ce life in flue gas desulfurization scrubbers and pipe lines, prolonging th e risk of blistering to the lining. The corresponding data were also evalua ted in hydrochloric acid.