The filter bags fitted to the top of the drying tubs retain any stray particles of the sample being fluidised while allowing the passage of the exit gases. There are just two sizes of bag for the whole range of tubs and a wide choice of materials to ensure compatibility with the substance being dried and the drying temperature.
Nylon and terylene are normally chosen as filter bag materials; nylon is resistant to alkali vapours while terylene shows greater stability with acids. Polypropylene is inert to most chemicals but degrades more rapidly than the above materials over 100°C. A special alkali-tolerant material, nomex, is available for sustained high-temperature drying e.g. around 200°C. Finally, a fluorocarbon filter bag can be used when tolerance to both high temperature and a broad range of chemicals is required.
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