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Ignitability of Anechoic Chamber Foam by Electric Currents

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M. A. PLONUS · 1975

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Carbon foam in EMF testing chambers can ignite from electrical currents and release toxic smoke.

Plain English Summary

Summary written for general audiences

This 1975 technical study examined how electric currents can ignite carbon-impregnated foam used in anechoic chambers (specialized rooms that absorb electromagnetic waves). Researchers found two ignition mechanisms: contact fires from voltage differences over 100V and internal heating that causes smoldering. The burning foam releases dense toxic smoke.

Why This Matters

While this study focuses on fire safety rather than biological effects, it reveals an important reality about EMF testing environments. Anechoic chambers are the gold standard for EMF research because they eliminate interference from external electromagnetic sources. The fact that these specialized foams can ignite from electrical currents and release toxic smoke raises questions about the integrity of long-term EMF studies conducted in such facilities. More concerning is what this tells us about the electrical properties of materials designed to absorb electromagnetic energy. If carbon-impregnated foam can accumulate enough electrical energy to spontaneously combust, it demonstrates the very real physical power of electromagnetic fields that industry often dismisses as 'non-ionizing' and harmless.

Exposure Information

Specific exposure levels were not quantified in this study.

Cite This Study
M. A. PLONUS (1975). Ignitability of Anechoic Chamber Foam by Electric Currents.
Show BibTeX
@article{ignitability_of_anechoic_chamber_foam_by_electric_currents_g4507,
  author = {M. A. PLONUS},
  title = {Ignitability of Anechoic Chamber Foam by Electric Currents},
  year = {1975},
  
  
}

Quick Questions About This Study

Yes, carbon-impregnated foam used in anechoic chambers easily ignites when electric current passes through it. Two ignition types occur: contact fires from voltage differences over 100V and internal heating that causes smoldering.
Contact fires occur when two sharp points at a potential difference of more than 100 volts touch the conducting foam. This creates immediate ignition at the contact point between the electrical source and foam material.
Yes, burning carbon-impregnated anechoic foam releases voluminous amounts of dense toxic smoke. This unexpected byproduct poses serious health and safety risks in laboratory and testing environments where these materials are used.
Internal heating follows an I²R process where electrical resistance creates heat inside the foam. This begins with smoldering, progresses to a glowing chunk inside the material, then typically spreads to full ignition.
Carbon-impregnated foam absorbs electromagnetic waves, making anechoic chambers ideal for EMF testing by eliminating external interference. However, the carbon content also makes the foam electrically conductive and prone to ignition from electrical currents.