Electrostatically charged materials and IPA

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SUMMARY

The discussion centers on the impact of isopropyl alcohol (IPA) and soapy water on electrostatically charged HVAC filters. It is established that soaking these filters in IPA or washing them with soapy water diminishes their static charge due to the conductive properties of these liquids, which provide pathways for charge dissipation. The conversation also clarifies that while some filters are permanent and made of metal, others are disposable and made of materials like paper or cotton, which should not be cleaned but replaced. Additionally, polyurethane, a common material in some filters, is incompatible with IPA, leading to structural damage.

PREREQUISITES
  • Understanding of electrostatic principles and charge dissipation
  • Familiarity with HVAC filter types and their materials
  • Knowledge of the chemical properties of isopropyl alcohol and soap
  • Awareness of the maintenance requirements for different filter types
NEXT STEPS
  • Research the effects of humidity on static electricity
  • Learn about the maintenance and cleaning protocols for electrostatic filters
  • Investigate the compatibility of various cleaning agents with filter materials
  • Explore the differences between permanent and disposable HVAC filters
USEFUL FOR

This discussion is beneficial for HVAC technicians, filter manufacturers, and anyone involved in the maintenance or selection of air filtration systems, particularly those dealing with electrostatic filters.

LT72884
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I just read an article about how electrostaticly charged filters, such as hvac filters, the charge is reduced if soaked in ipa or washed with soapy water. I know some peoe want to save money so they wash the filters.

My question is, why does rubbing alcohol and soapy water cancel the charge? Does it have something to do with the electronegativity of the hydrogen bonds?

Thanks
 
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I could well be wrong here, but electrostatic filters - to my knowledge - are made of metal, and are permanent : cleaning them manually every year or so is part of the charm of owning one.

You could be referring to the secondary filters which are just paper/cotton/whatever. They aren't supposed to be cleaned, they're supposed to be replaced.
 
hmmm27 said:
I could well be wrong here, but electrostatic filters - to my knowledge - are made of metal, and are permanent : cleaning them manually every year or so is part of the charm of owning one.

You could be referring to the secondary filters which are just paper/cotton/whatever. They aren't supposed to be cleaned, they're supposed to be replaced.

I was assuming it was simply an air filter holding a static charge, not an "electrostatic filter".

OP, can you clarify this?
 
So the mechanism of an electrostatic air filter is that air has to blow over the polypropylene and polyurethane meshes to gain charge and become stuck.

1. Neither of those materials would be hurt by soap, and soap makes sense to me to use because the function of the filter requires the surface to be clean. I am not sure on this one.

2. Polyurethane is NOT compatible with IPA. It will swell and become weak, ruining the mesh structure.
 
Apparently more than one type of "electrostatic filter".
 

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