| 1 | Hydrogel Self-Adhesive Pads | A flexible conductive layer coated with a water-containing hydrogel adhesive. | The moist hydrogel conforms to the skin, spreads current over the contact area, and helps reduce localized current density. | TENS, EMS, muscle re-education, and general electrical stimulation. | Easy placement, comfortable contact, and no conductive gel usually needs to be applied separately. | The hydrogel can dry out or lose adhesion with repeated use, heat, sweat, or poor skin preparation. |
| 2 | Carbon Rubber Pads | Conductive carbon-rubber or carbon-loaded polymer material combined with an adhesive interface. | The conductive rubber distributes stimulation pulses across the pad while the adhesive layer holds it against the skin. | Reusable TENS and EMS systems, rehabilitation, and muscle activation. | Flexible, durable, and generally resistant to mechanical wear. | Usually requires a separate conductive gel or moist interface; uneven contact can increase discomfort. |
| 3 | Silver/Silver-Chloride Pads | A silver or silver-chloride conductive element paired with a hydrogel or adhesive electrolyte layer. | The electrode-electrolyte interface supports relatively stable charge transfer and helps limit polarization during stimulation. | Clinical monitoring, bio-signal interfaces, TENS, and other controlled stimulation systems. | Good electrical stability and consistent skin-electrode contact when properly hydrated. | Performance depends on the electrolyte condition, storage, and correct skin preparation. |
| 4 | Fabric or Textile Electrodes | Conductive fibers, yarns, or printed conductive coatings integrated into a flexible textile backing. | The textile conforms to body movement and transfers current through a conductive layer, often with a hydrogel or moisture-assisted interface. | Wearable stimulation garments, rehabilitation prototypes, and movement-related applications. | Lightweight, flexible, and suitable for larger or contoured body areas. | Resistance may change with stretching, washing, moisture, and the quality of skin contact. |
| 5 | Foam-Backed Pads | A conductive surface mounted on a soft foam backing with an adhesive perimeter or adhesive conductive layer. | The foam provides cushioning and helps maintain consistent pressure between the conductive surface and the skin. | TENS, EMS, temporary rehabilitation, and applications requiring added comfort. | Comfortable, conformable, and useful on slightly curved body surfaces. | Foam can retain heat or moisture, and thicker pads may be less suitable under tight clothing. |
| 6 | Flexible Film Pads | A thin conductive film, such as a printed polymer or metalized layer, on a flexible adhesive substrate. | The thin conductive layer follows body contours and delivers the electrical waveform through the adhesive skin interface. | Low-profile wearables, localized stimulation, and applications where unobtrusive placement is needed. | Thin, lightweight, and easy to integrate into wearable designs. | Wrinkles, folds, or damaged conductive traces can create nonuniform current distribution. |
| 7 | Large-Area Pads | A broad adhesive electrode surface designed to cover a relatively large skin area. | The larger contact area lowers average current density for a given delivered current and can provide broader stimulation. | Large muscle groups, back, thigh, shoulder, and rehabilitation programs. | Broad coverage and potentially more comfortable stimulation at comparable settings. | Requires sufficient flat skin area and careful placement to avoid lifting at the edges. |
| 8 | Small or Point-Target Pads | Compact adhesive electrodes with a smaller conductive contact area. | The smaller surface focuses stimulation over a localized area, although current density is higher at the same current level. | Localized TENS, smaller muscle groups, and areas with limited available space. | Precise placement and convenient use on narrow or curved body regions. | May feel sharper at higher intensities; placement and skin contact must be carefully controlled. |
| 9 | Pre-Gelled Disposable Pads | A single-use pad supplied with a prepared conductive gel or hydrogel surface and a protective liner. | The pre-gelled interface reduces contact impedance and transfers stimulation pulses without separate gel preparation. | Clinical, home-care, emergency, and hygiene-sensitive environments. | Fast setup, consistent hygiene, and simple disposal after use. | Limited reuse, higher ongoing consumable cost, and reduced adhesion after the gel dries. |
| 10 | Multi-Zone or Segmented Pads | Two or more electrically separated conductive zones incorporated into one adhesive pad. | Independent zones can deliver stimulation to different nearby locations or create multiple current paths when used with a compatible controller. | Advanced rehabilitation, experimental wearable systems, and coordinated muscle stimulation. | Fewer separate pads and more flexible placement within a defined body area. | Requires compatible equipment, accurate alignment, and careful control of each electrical channel. |