BIOPAC® Systems, Inc. Logo

Electrode Properties – gel and adhesive

SALT CONTENT

Disposable Electrode
Chloride %
EL500
10%
EL501
10%
EL502
4% (solid gel)
EL503
7%
EL504
4% (solid gel)
EL507A
n/a: dry electrode—use with isotonic gel GEL101A
EL508
10%
EL509
n/a: dry electrode—use your own choice of gel

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.

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.

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.

WET

The salt content in WET gel electrodes from BIOPAC varies:

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.

Associated Applications

Associated Disciplines

Spotlight On
Impedance electrodes with leads

Bioimpedance Strip Electrode with Leads

Pack of four strip electrodes with TP leads attached, intended for bioimpedance applications. Each electrode is 16.5 cm x 1.3 cm (6.5″ x 0.5″) with four 15 cm lead cables that terminate in 1.5 mm Touch Proof sockets. The electrode  is foam backed and uses hydrogel to adhere the electrode to the participant and provide […]

View All
Latest News

New Citations | BIOPAC in Exercise Physiology

Exercise physiology is the study of the body’s response to physical activity. Research in exercise physiology allows for insights in health and for a better understanding of the functions of the body at work. Here are some recent studies in exercise physiology that utilized BIOPAC tools for their research… Effect of exercise on electrocardiographic parameters […]

Electrocardiography Guide Available

BIOPAC’s comprehensive Introductory ECG Guide addresses fundamental to advanced concerns to optimize electrocardiography data recording and analysis. Topics include: ECG Complex; Electrical and Mechanical Sequence of a Heartbeat; Systole and Diastole; Configurations for Lead I, Lead II, Lead III, 6-lead ECG, 12-lead ECG, precordial leads; Ventricular Late Potentials (VLPs); ECG Measurement Tools; Automated Analysis Routines for extracting, […]

Read All
Request a Demonstration
Request a Demonstration