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Electrode Properties – gel and adhesive

SALT CONTENT

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.

Disposable
Electrode
Chloride %
EL500
10%
EL501
10%
EL502
4% (solid gel)
EL503
7%
EL504
4% (solid gel)
EL506
n/a: strip electrode; Ag laminated on med. grade cloth
EL507
0.5%
EL508
10%
EL509
n/a: dry electrode—use your own choice of gel

SOLID

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.
WET
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.
DURATION
We do not recommend for applications running more than 24 hours.
IRRITATION FACTORS
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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