For electrical stimulation, generally, the lower the electrode salt content, the less skin irritation the subject will experience; this is because fewer salt ions are driven into skin during stimulation. This strategy puts more demand on the stimulator, because skin impedances are higher with low salt electrodes. There is no one size fits all requirement. For example, it’s possible to help mitigate the undesirable effects of higher salt content electrodes by stimulating the subject with bipolar pulses, instead of unipolar pulses.
The salt content in all SOLID gel electrodes from BIOPAC is 4%. This universal gel can be used short and long term, and is suitable for adult and infants.
SOLID gels are gentler on the skin than WET gels at the same salt concentration. This is due to the higher water content in the WET gels that make them react faster and more aggressively on the skin.
If there are two (2) electrodes with 4% salt , one (1) WET gel and one (1) SOLID gel, the WET gel would be more reactive/aggressive.
The salt content in WET gel electrodes from BIOPAC varies:
10% is used for short term applications such as Resting ECG or Stress Test.
7% is a more universal gel and can be used for short and—for most subjects, though some react—long term
3% is a monitoring gel used for more than 24 hours.
1% is a sensitive skin gel, common (infants/elders).
0.5% in EDA/GSR electrodes.
We do not recommend for applications running more than 24 hours.
Possible skin irritation can result from the gel or the adhesive on the body of the electrode.
EL503 gel and adhesive are aggressive
EL502 uses a non-aggressive gel (solid gels are always less aggressive than wet gels with similar salt concentrations) with an aggressive adhesive.
Note—About 2 % of the population will react to any adhesives and gels put on a skin, regardless of composition or concentration.
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