Salt Bridge

Salt Bridge Series

For Reference Electrode Isolation, Low-Contamination Measurements & High-Precision Electrochemistry High Borosilicate Glass Construction | Fully Customizable

Salt bridges are essential in electrochemical systems requiring physical separation between the reference electrode and the test electrolyte, while ensuring ionic conductivity and minimizing contamination. FrankLab provides a full range of high-performance salt bridges engineered with high borosilicate glass, precision porous junctions, and customizable geometries for advanced scientific research.

Why FrankLab Salt Bridges?

High Borosilicate Glass

Each salt bridge is made from laboratory-grade high borosilicate glass, offering:

•Excellent chemical corrosion resistance

•High thermal shock stability

•Smooth interior for easy cleaning

•Durable structure for repeated long-term use

• Low-Leakage Porous Junctions

Available materials:

• Porous glass

• Ceramic

• PTFE junctions

Providing:

• Stable ionic conduction

• Minimal electrolyte crossover

• Low noise in CV/EIS/LSV

• Excellent long-term measurement stability

• Fully Customizable

FrankLab supports full customization across all salt bridge types, including:

• Length / Outer diameter

• Junction material & porosity

• Bent, straight, U-shaped, or specialty geometry

• Internal electrolyte (KCl, KNO₃, Na₂SO₄)

• Adapters for reference electrodes

• Custom shapes for PEC cells, H-type cells, flow reactors

1. Straight-Type Porous Glass Salt Bridge

Classic design for general-purpose electrochemical setups

A versatile straight salt bridge compatible with standard three-electrode glass cells, H-type reactors, and jacketed vessels.

Key Features

• Straight high borosilicate glass tube

• Porous glass or ceramic junction

• Ideal for reference electrode isolation

• Widely used in CO₂RR, ORR, HER/OER, corrosion studies

Recommended Applications

• Standard beakers and reactors

• Thin-layer experiments

• Cells requiring precise, vertical insertion

2. Bent Porous Glass Salt Bridge

Optimized for confined spaces & angled positioning

The bent design allows the junction to be positioned closer to the working electrode while avoiding mechanical interference with other electrodes.

Key Features

• 30°–120° bending options

• Perfect for small-volume reactors or angled electrode placement

• Reduces IR drop by positioning junction closer to WE

Recommended Applications

• Compact PEC cells

• H-type cells with limited vertical clearance

• Custom small-volume electrochemical cells

3. Luggin Capillary

High-precision IR-drop minimization

A Luggin capillary is used to direct the reference electrode’s sensing point very close to the working electrode, providing:

• Reduced solution resistance (IR drop)

• More accurate potential control

• Essential for kinetic studies requiring high precision

Features

• High borosilicate glass micro-capillary

• Fine-tip design for proximity placement

• Compatible with most reference electrodes

Applications

• Fast electron-transfer studies

• Tafel analysis

• Microelectrode systems

4. U-Shaped Salt Bridge

Maximized physical separation between electrolytes

The U-shaped geometry provides:

• Large physical displacement

• Strong isolation between internal/reference electrolyte and test electrolyte

• Reduced contamination and improved stability

Perfect for:

• Highly sensitive chloride-free systems

• Hg/Hg₂SO₄ and Hg/HgO reference electrodes

• CO₂RR experiments with strict contamination control

• Multi-phase electrolytes

 Technical Specifications (Applies to All Salt Bridge Types)

Customization Available (Fully Customizable by FrankLab)

FrankLab specializes in custom salt bridge fabrication for advanced electrochemical research.

Customizable Options

• Straight / Bent / L-type / U-type

• Custom bending angle（30°–120°）

• Outer diameter & length

• Junction type & porosity

• Micro-tip or extended-tip geometry

• Electrolyte compatibility modules

• Reference electrode adapters

• Flow cell or PEC-cell-specific salt bridge designs

Your tailored design + quotation arrives within 24 hours.