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Home » Bagfilters » Filtration media » BHA-Tex » Frequently asked questions

BHA-Tex® at 2500x magnification;

What is it?

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FAQs

BHA-TEX® - ePTFE Membrane for Enhanced Dust Collection
Frequently Asked Questions

Why do BHA-TEX® Filter bags operate at a lower pressure drop?

A. The pressure drop across a filter bag almost always increases due to one of two reasons:

  1. Surface blinding caused by agglomeration of moist or sticky dust on the bag surface; and
  2. Depth penetration of fine particulate into the fabric, which cannot be removed during cleaning.

BHA-TEX nearly eliminates these two causes of high-pressure drop because of its microporous structure, ultra high efficiency and dust-releasing properties.
At what emission requirement should I consider upgrading from my standard filter to the surface filtration provided by a bag laminated with ePTFE membrane (BHA-TEX)?
This is a tricky question since all emission levels are conditional upon inlet grain loading, filtration velocities, particle size and distribution and collector style. Generally emission requirements of less than 20 mg/m3, may require a filter bag constructed with ePTFE membrane (BHA-TEX) to achieve these levels on an ongoing basis. Dust populations with a significant percentage of particulate below 10 microns are especially difficult to maintain low outlet emission levels.
Will filter bag life be increased by using BHA-TEX filter bags?
BHA-TEX filter bags can provide many years of operation and will usually provide a longer service life, however the current mode of bag failure must be analysed on a case by case basis. BHA-TEX filter bags rarely require replacement due to high pressure drop or low airflow. On the rare occasion of failure, ePTFE filters require replacement due to loss of strength of the base fabric which can be caused by mechanical wear, chemical attack, thermal breakdown or flex fatigue. Longer bag life can be achieved because the lower pressure drop provided by the ePTFE membrane allows for reduced cleaning, which reduces mechanical wear and flex fatigue. BHA-TEX has been known to increase filter bag life by up to five times!
Under what conditions should I consider switching from a polyester filter bag to a filter bag constructed from Acrylic? (The same question applies to both ePTFE membrane as well as conventional polyester and acrylic filter bags.)
Polyester can lose strength due to hydrolysis in atmospheres where moisture and heat are present. As a general rule of thumb hydrolysis does not become a major factor at temperatures below 100°C. The rate of hydrolysis increases exponentially as both heat and moisture levels increase. Applications with temperatures averaging above 110° C and high moisture are especially vulnerable to moist heat hydrolysis. Please contact us for assistance analysing your specific application.


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