Hydrogel For Stim Machine

Bulk conductive hydrogel rolls for TENS/EMS converters. Formulated with calibrated cross-linking to prevent rotary die-cut fouling and maintain < 50 Ohms impedance.

This hydrogel is a semi-finished, bulk ion-conducting polymer matrix formulated for electrical stimulation hardware. We manufacture and supply this raw material in continuous master rolls or pre-cut sheets directly to B2B electrode pad converters and wearable medical device OEMs. The substrate functions as the primary electrical interface and structural adhesive, bridging the hardware's printed circuit to the human epidermis. It abandons external chemical couplants by suspending chloride electrolytes within a viscoelastic polyacrylamide network.

• Rheology for High-Speed Die-Cutting 

  When secondary converters feed standard hydrogels into high-speed rotary die-cutters, the mechanical pressure of the anvil squeezes the gel outward. This bleeding effect gums up the steel blades, forcing production halts for cleaning. We calibrate the storage modulus (elasticity) of the polymer network. Under vertical shear, the matrix snaps cleanly at the cut line rather than flowing. This structural memory allows B2B converters to run continuous stamping processes without adhesive fouling along the perimeter. 

   

• Controlled Cohesive Fracture 

  A common failure mode for generic hydrogels is leaving sticky, difficult-to-wash slime on the patient's skin. This occurs when the gel's adhesive force to the epidermis exceeds its own internal cohesive strength. During polymerization, we manipulate the cross-linking density. This forces the internal physical bonds of the hydrogel to remain stronger than its surface tackiness. When the final pad is removed, the gel layer peels away as a single intact structural mass, completely avoiding epidermal residue. 

   

• Hardware Oxidation Suppression 

  To achieve low electrical impedance, the aqueous matrix requires freely moving salt ions (chlorides). However, high chloride concentrations aggressively corrode the metal rivets and silver traces used in the final pad assembly. We restrict the electrolyte titration to a specific density threshold. This chemical balance pushes the substrate's impedance below 50 Ohms to pass high-mA TENS pulses, while actively delaying the electrochemical degradation of the OEM's connected hardware interfaces.

• Coating Gap Customization: Standard gel thickness is 1.0mm. We can adjust the coating head gap down to 0.5mm for ultra-thin wearables, or up to 1.5mm for high-cushion pediatric applications. 

• Logistics Routing : Bulk polymerization and master roll coating are executed in our China facilities. Master rolls can be shipped directly, or routed through our Vietnam hub for secondary slitting and blanking to manage specific international trade logistics.

• Systems : Compounding lines operate within audited ISO 13485:2016 quality management protocols.

• Regulatory Compliance: Our hydrogel technical files provide the necessary chemical characterization data to support OEM hardware brands in their FDA 510(k) and CE (MDR) submissions.

B2B converters and medical OEMs can request master roll samples to verify die-cut compliance and impedance mapping.

👉 [Request Hydrogel Master Roll Samples]

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