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In Focus: Exploring Magnetic Filter Bars and Rods

The Meaning of Magnetic Filter Bars

Magnetic filter bars, also known as magnetic rods or magnetic tubes, are widely used to remove ferrous contaminants from liquids, powders, granules, and other materials during various industrial processes. They are very important components of the magnetic separator, such as grate magnets and magnetic drawers.

Magnetic Filter Bars

Magnetic Filter Bars
Usually, magnetic filter bars are composed of neodymium magnets to form a high-density magnetic field circuit. It is sealed in a 304 stainless steel tube by welding, which ensures it is leak-free and waterproof. It can remove the ferromagnetic substances in mud and powder. With magnetic intensity surpassing 12000 Gauss, magnetic filter bars can even capture particles at the nano-level.


                          Photo Credit: GTEK


Food Grade Grate tymagnets.com 1

Grate Magnets
Grate magnets, also known as magnetic grates or magnetic grids, consist of a series of magnetic tubes or rods arranged in a grid-like pattern. These tubes are typically encased within a stainless steel housing, creating a sturdy and durable structure. The magnetic tubes’ arrangement allows maximum exposure to the material flow, optimizing the capture of ferrous contaminants.



                          Photo Credit: GTEK


Easy Clean Drawer tymagnets.com

Magnetic drawers
Magnetic drawers feature a drawer-like housing containing magnetic tubes. These magnetic tubes are strategically positioned to facilitate maximum exposure to the material flow, thereby optimizing the capture of ferrous contaminants and letting non-ferrous materials pass through unhindered.





                      Photo Credit: GTEK

Magnetic Field Distribution of Magnetic Filter Bars

The graphic below illustrates the magnetic field distribution of the magnetic filter bars, with the highest magnetic fields highlighted in red.

magnetic filter bar strongwaterproof 25 x 150 2 x m6in n 1

Photo Credit: Enesmagnets

Specifications of Magnetic Filter Bars & Rods

The most common sizes are 10mm, 25mm, and 50mm in diameter, but custom sizes are also available. The common shapes of magnetic filter bars include round, square, and rectangular. Magnetic filter bars with different specifications could be made to meet the diverse application requirements.


Photo Credit: Magfine

How to choose magnetic filter bars? The main parameters of the magnetic filter bar

  • Max. Surface Gauss: This refers to the level of magnetic force on the surface of the filter bar. Higher magnetic strength ensures better particle capture even in high-flow applications.
  • Length and Diameter: Larger and longer bars provide more contact area, allowing for greater particle retention.
  • Shape and Configuration: Various shapes are available, such as round, square, or rectangular. The shape and arrangement can impact the flow dynamics and particle capture efficiency.
  • Construction Material: Filter bars are typically constructed using stainless steel tubes and strong permanent magnets. The choice of materials affects their durability and compatibility with different substances.
  • Tube Wall Thickness: The thickness of the stainless steel tube housing the magnets is very important. Thicker walls provide more robust protection against wear and tear.
  • Mounting Options: According to the installation requirements, filter bars can be designed with various mounting options, such as threaded ends, flanges, or mounting brackets. 
  • Cleaning Mechanism: Some magnetic filter bars are designed for self-cleaning in some special applications.
  • Working Temperature and Environment: The working environment and temperature play a significant role in the selection of filter bars. Some applications require filter bars that can withstand high temperatures or aggressive chemicals.
  • Flow Rate: The flow rate of the material passing through the filter bars impacts the contact time between the contaminants and the magnetic field. Proper sizing of filter bars ensures effective particle capture within the given flow rate.
  • Certifications: Depending on the industry and application, certain certifications (such as food-grade or sanitary certifications) might be required for the filter bars.


Cleaning Magnetic Filter Bars

With a simple manual cleaning, ferrous debris can be easily removed from the magnetic filter bars. The cleaned bars will continue to collect ferrous particles, saving the maintenance cost
Nowadays, self-cleaning magnetic filter bars are also available, keeping downtime to an absolute minimum.

zdjecie z opilkami 2 800x600 2

Photo Credit: Enesmagnets

Applications of Magnetic Filter Bars

Magnetic filter bars, also known as magnetic filter rods or magnetic bars, are versatile magnetic separators widely used across various industries to remove ferrous contaminants from liquids and dry materials.

  • Food and Beverage Industry
    Magnetic filter bars play a crucial role in removing magnetic and paramagnetic particles such as iron fragments, rust, and stainless steel particles from raw materials, ingredients, and finished products. They are commonly used in processes such as raw material inspection, liquid processing, and chocolate and confectionery production.
  • Chemical Industry
    The chemical industry employs magnetic filter bars to purify liquids and protect equipment from the damaging effects of metal contamination. Applications include:
    Solvent Filtration: Magnetic bars are used to filter solvents and chemicals, ensuring that particles do not interfere with chemical reactions or contaminate the final products.
    Paints and Coatings: They are used to prevent metallic contamination in paint and coating formulations.
  • Water Treatment
    Cooling Towers: These filters help prevent scale buildup and clogging in cooling systems, reducing maintenance requirements.
    Wastewater Treatment: Magnetic bars aid in removing metallic particles from wastewater, enhancing the efficiency of downstream treatment processes.


Photo Credit: MPCO

Need a Magnetic Filtration Solution?

While customers may have a basic understanding of magnets, specialists can guide them toward more appropriate and effective solutions. At Tengye, we’re thrilled to be early participants in your new projects. Our passion for magnets extends from material selection and design optimization to providing magnetic solutions. We hope to bring our knowledge and experience to the forefront by actively engaging in your upcoming projects. Get the right magnet solution with our expert assistance.

Fill out the form and work with experts for the best filtration methods for your process!

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Jonah Jin

Jonah Jin
Managing Director

Every customer deserves to be treated professionally and responsively.