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Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ

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Why Polypropylene Bags?

Polypropylene Felt bags "soften" somewhat at 190 F. Yet almost all EN platers seem to prefer them to Polyester felt, which is somewhat more resistant to temperature. Anyone wish to comment?

Normand Boutin
Filter bag supplier - Agawam, MA, USA
February 7, 2009

Because they are readily available from a number of sources, competition lowers the price, they work just fine and "that's the way we have always done it".

James Watts
- Navarre, Florida
February 10, 2009

February 11, 2009

Normand,

I can't say all the reasons, but generally the chemical resistance of the polypro is proven and the material is used for other types of bags (i.e. anode bags). Some of the specification may be "me too". By this I mean that process manufacturers specify the same materials as their competitors because they do not want to be different.

I would like to know besides temperature stability, what do you feel the advantage of the polyester bag would be over polypro?

Gene Packman
process supplier - Great Neck, New York

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