PPS vs PTFE Filter Bags: What Matters Beyond Temperature?
Temperature is often the first figure buyers compare when choosing between PPS and PTFE filter bags. It matters, but a higher temperature rating does not automatically mean a better fit for the process. Gas composition, moisture and the bag’s construction also need reviewing.
PPS: review the oxidising conditions
PPS filter bags are used in applications requiring resistance to moisture and various chemicals. Their suitability still depends on the operating conditions, particularly oxidising exposure at the working temperature.
Provide the oxygen content, normal and peak temperatures, and any available gas composition data. A general material chart is a starting point; it does not confirm suitability for a particular gas stream.
PTFE: clarify what the quotation describes
“PTFE filter bag” can describe different constructions. It may refer to PTFE-based media or a PTFE membrane laminated to another material.
That distinction matters. A PTFE membrane does not make the supporting material PTFE. The substrate, scrim and other construction details still need to be considered when reviewing operating limits.
Compare quotations on the same basis
Give each supplier the same process information: continuous and peak temperatures, how long peaks last, moisture conditions, oxygen content and known corrosive components. Include the cleaning method and current bag specification where available.
Then check what each quotation includes, particularly the base media, scrim, membrane and seam construction. Two offers labelled “PTFE” may describe quite different bags.
For a material review, send Verlofy your operating conditions and existing specification. If some gas data is unavailable, identify what is missing so it can be addressed before the material is confirmed.
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