Raw Material Selection Criteria & Standard Warehouse Storage Rules For Disposable ECG Electrodes

Published: JULY 27, 2026 - Shanghai Zhichen Medical Technology Co., Ltd.

The stable signal performance and long shelf life of disposable ECG electrodes depend entirely on qualified medical raw materials and standardized warehouse management. Improper material selection or chaotic storage will lead to high impedance, skin allergy, gel dehydration and mass defective finished goods. This article sorts out complete raw material screening standards and full-process warehouse operation specifications for ECG electrode manufacturers.

1 Core Raw Material Selection Standards For ECG Electrodes

1.1 Conductive Hydrogel

Conductive hydrogel is the core signal transmission medium of ECG patches, with four key screening indicators:

1. Low impedance & hypoallergenic formula, pass ISO 10993 cytotoxicity and skin irritation tests;

2. Strong water-locking performance to avoid rapid dehydration during long-term storage;

3. Moderate viscosity without overflow during die-cutting packaging;

4. Stable chemical property after EO sterilization, no stratification or discoloration.

1.2 Conductive Backing & Substrate Materials

Three mainstream backing types for medical electrodes: medical foam, lint-free non-woven fabric and paper base, matched with aluminum conductive foil:

• Aluminum foil: uniform thickness, no pinholes, anti-oxidation treatment;

• Foam: high air permeability, soft texture to prevent skin redness;

• Non-woven: low-lint, suitable for pediatric & sensitive skin electrodes;

All substrates must be chemically inert and will not react with hydro after long storage.

1.3 Medical Adhesive & Release Liner

Medical hypoallergenic pressure-sensitive adhesive and silicone release liner are critical to peeling experience:

Adhesive: sweat-resistant, complete peeling without residual glue on human skin;

Release liner: uniform silicone coating, anti-static for high-speed automatic production.

1.4 Ag/AgCl & Carbon Conductive Snaps

Two mainstream conductive connecting snaps with strict testing standards:

Metal Ag/AgCl snap: ±0.03mm dimensional tolerance, uniform silver plating, pass salt spray anti-corrosion test;

Carbon composite snap: evenly dispersed conductive carbon, no internal injection voids to prevent package piercing.

1.5 Sterile Paper-Plastic Packaging Film

Medical composite packaging needs dual properties: EO gas permeability and low water vapor barrier, blocking external moisture to protect hydrogel activity during shelf life.

1.6 Auxiliary Production Materials

Including conductive silver paste, non-toxic printing ink and plastic snap protective caps, all materials must meet medical grade safety standards.

2 Standard Warehouse Storage Management Specifications

2.1 Warehouse Constant Temperature & Humidity Environment

Storage environment standard: 15℃-25℃, relative humidity 40%-60%. Keep away from direct sunlight, water seepage and large temperature fluctuation.

2.2 Classified Storage Rules For Different Raw Materials

• Liquid hydrogel & adhesive: sealed and shaded storage; avoid freezing, FIFO management, shelf life within 6 months;

• Foam, non-woven, aluminum foil rolls: horizontal rack storage, off ground;

• Metal & carbon snaps: sealed moisture-proof separate storage boxes;

• Packaging film: prevent scratch by sharp objects.

2.3 Stacking, Handling & Batch Marking Rules

All raw materials must be placed on plastic pallets to avoid ground damp. Mark batch, incoming date and expiration date for traceability.

2.4 Regular Inspection & Expired Material Disposal

Daily temperature & humidity log; monthly sampling test for hydrogel viscosity & impedance. Expired raw materials isolated and scrapped.

2.5 Warehouse Safety & Hygiene Supplementary Requirements

Dust-proof access, operators wear clean gloves, fire equipment placed around chemical storage area, no open flame.

3 Raw Material & Storage Affect Finished Electrode Quality

High-quality raw materials will fail under improper storage. High humidity causes metal snap oxidation and hydrogel dehydration. Scientific raw material matching + standardized warehouse management can lower reject rate and guarantee stable clinical monitoring performance.