Electro Pads for TENS Unit

B2B electro pads engineered for TENS pulse generators. Features non-polarizing carbon films for asymmetrical biphasic waveforms and impedance-bypassing hydrogels.

These electro pads function as the mandatory electrochemical bridge between a Transcutaneous Electrical Nerve Stimulation (TENS) unit and the human nervous system. Pulse generators output high-voltage electron flow, which must be safely converted into an ionic current to cross the epidermal barrier. By combining a low-polarization carbon film with a cross-linked electrolyte hydrogel, this substrate executes the phase-shift required for pain gating protocols. We manufacture these universal interfaces in bulk for B2B physical therapy distributors, wearable hardware OEMs, and OTC pharmacy chains.

The lamination architecture is optimized for alternating current (AC) loads. A structural carrier (spunlace or PU) is coated with a conductive carbon ink that is specifically formulated to resist electrochemical polarization. The skin-contact layer is a pressure-sensitive, highly hydrated polyacrylamide gel doped with specific chloride salts. When the TENS unit fires, the gel's internal ionic lattice actively transports the charge through the dead skin cells of the stratum corneum, preventing the electrons from bottlenecking at the surface. Raw materials are audited against ISO 10993 limits. Standard rotary die-cut production requires a 20,000-pack MOQ.

• Biphasic Waveform Compatibility 

  Modern TENS machines output an asymmetrical biphasic waveform. The current rapidly alternates direction to prevent acidic or alkaline buildup on the skin. If a cheap pad uses highly polarizable materials, it resists this rapid phase reversal, acting like a capacitor. This trapped energy generates severe localized heat. Our carbon film and hydrogel matrix are engineered to be strictly non-polarizing. They instantly yield to the reversing electrical vectors, ensuring a cool, flat voltage curve that prevents galvanic burns during 60-minute continuous therapy sessions. 

   

• Stratum Corneum Impedance Bypassing 

  The human stratum corneum (the outermost layer of dead skin) presents an extreme dielectric barrier to electrical signals. In clinical settings, nurses vigorously scrub the skin with alcohol to lower this resistance. Home-use consumers skip this prep step. To counteract unwashed, highly resistive skin, our hydrogel is titrated with aggressive humectants and a high density of mobile ions. The fluid matrix chemically wets out the epidermal topography, forcing the electrical current through the lipid barriers without requiring the user to manually abrade their skin. 

   

• Micro-Climate Pouch Sealing

  A hydrogel pad is essentially a suspended water matrix. If shipped in standard polyethylene bags, the ambient atmosphere slowly sucks the moisture out of the polymer. The gel crystallizes and loses all electrical conductivity before it ever reaches the patient. We package all bulk and OEM electro pads inside heavy-gauge AL/PE (Aluminum/Polyethylene) composite foils. This metalized shroud establishes a strict thermodynamic micro-climate, driving the Moisture Vapor Transmission Rate (MVTR) to near-zero and guaranteeing a 24-month field readiness.

• Die-Cut Tolerance Mapping : We machine custom rotary anvils to output precise 50x50mm, 50x90mm, or specialized lobed geometries. The edge glue overflow is mechanically restricted to under 0.5mm, ensuring the pads can be safely stacked in bulk pouches without fusing together. 

• Logistics Routing : Base conductive film printing and hydrogel formulation execute in our primary China facilities. Final dimensional die-cutting, terminal integration, and high-barrier pouch sealing are routed through our Vietnam hub, isolating the supply chain from specific consumer electronics trade tariffs.

• Biocompatibility Endpoints : Polymeric extracts are routinely audited against ISO 10993-5 (Cytotoxicity) and ISO 10993-10 (Sensitization) limits. 

• Quality Systems : High-speed continuous converting lines and pouching machinery operate firmly under audited ISO 13485:2016 and MDSAP regulatory frameworks.

B2B procurement teams and hardware developers can request die-cut tolerance prototypes and impedance mapping reports. 

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