Stronger Magnets - better filtration
- One Eye Industries uses the highest quality grade Rare Earth magnets in the world to create its Magnetic Filters. There are two types of Rare Earth magnets, Neodymium and Samarium-Cobalt. We use Neodymium Magnets, that have a maximum operating temperature of 300°F/150°C and a Curie Temperature of 644°F /340°C, meaning the point at which they magnets will lose their magnetic force.
- These high quality magnets, are then carefully installed in stainless steel rods, according to our patented method. This results in our Magnetic Filters possessing Magnetic strength 10x that of our competitors. This Magnetic technology also allows us to collect both ferrous and non-ferrous contaminants from fluids and rotating equipment. (See FAQ below for more information).
Magnets used in some filters can have a magnetic strength (flux density) as high as 28,000 gauss, while a fridge magnet is 60 gauss. The rule of thumb is, the higher the flux density, the higher the potential magnetic force acting on nearby particles.
- BUT, the only reliable method of identifying the magnetic strength of a magnetic filter, is to identify the holding strength and the contaminant holding capability. All OEI magnetic filters are tested and rated for a true understanding for the applications they are designed for.
Holding Capacity and Magnetic Strength
Magnetic Field Holding Strength Testing (Pull Force):
Magnetic Field Holding Strength is the force required to pull a round steel bar from a filter’s Magnetic Field.
One Eye Industries tests the Magnetic Holding Strength of all its Magnetic Filters by attaching a tray and a steel bar to the Magnetic Filter, which is equal in length and diameter to the Magnetic Filter. Then, weights are added to the tray until the tray is stronger than the holding strength, and pulls the steel bar away from the Magnetic Filter. This is an accurate test for the holding strength of the magnetic fields. The Magnetic Field Strength testing photos shown to the right, is data based on the diameter of the Magnetic Filter Rods.
Dirt Holding Capacity:
Dirt Holding Capacity is the amount of contaminants a filter can trap and hold, before reaching a maximum allowable pressure drop.
To measure Dirt Holding Capacity we do not use the ISO 16889 multi-pass test, as other companies do, because OEI measures the amount of contamination the Magnetic Fields holds in place. This is tested by weighing the rod first without any contaminants, then slowly saturating the rod with contamination in incremental amounts until the magnetic rod cannot hold anymore. This peak saturation point of the Magnetic filter is the dirt holding capacity of the filter.
OEI’s high Dirt Holding Capacity for micron sizes (<1 to over 100) exists because our powerful magnetic fields are able to hold much more than traditional media filters. Traditional filters’ dirt holding capacities are affected by pore size, pore density (number of pores in a section of the filter), filter depth and the type of filter media. OEI’s Magnetic Filter technology is not affected by these factors. The magnetic strength of the OEI’s patented technology far outperforms traditional media filter in capturing and holding dirt and contaminants.
The photos to the right demonstrate OEI’s superior Magnetic Strength and Dirt Holding Capacity.
1/2″ Diameter OEI Magnetic Rod- Dirt Holding Capacity: 820.55 grams or 1.81lbs per linear foot. Total Magnetic Field Holding Strength: 57lbs per linear foot.
3/4″ Diameter OEI Magnetic Rod- Dirt Holding Capacity: 1351.25 grams or 2.98lbs per linear foot. Total Magnetic Field Holding Strength: 123lbs per linear foot.
Rare Earth Magnets
This magnet has the strongest magnetic strength of all magnets on the planet. It is made up of the compound (NIB) Neodymium Iron Boron (Nd2Fe14B), which is one of the strongest know ferromagnetic materials on earth. Since its discovery in the ‘80s, the strength of this magnet has actually increased due to new developments and technology. Pictured above is an OEI Magnetic Plug.
SmCo (Samarium Cobalt)
Also one of the Rare Earth Magnets, Samarium-Cobalt magnets can produce magnetic strength near that of NdFeB. Its discovery came in the ’70s, but was rarely used commercially due its expensive nature, fragility and difficulty to manufacture.
Ferrite (Ceramic) magnets were developed in the ’60s as common magnets for consumer use. This type of magnet is cost-effective and resistant to corrosion, however it lacks permanent magnetic strength and has a low level magnetic field.
Alnico Magnets were one of the first magnets created for human use, and were extensively used in WWII. The magnet has a 90% lower strength rating than Neodymium Magnets are very sensitive to demagnetization if damaged. These magnets are primarily used in manufacturing as they are excellent for high temperature use.
What are Rare Earth Magnets?
Rare Earth magnets are extremely strong magnets created from the Rare Earth Elements. There are two types of Rare Earth Magnets: Neodymium and Samarium-Cobalt. These magnets were originally discovered in the ’80s, after General Motors, Sumitomo and the China Academy of Science after these companies wanted to find a cheaper alternative to the already existing Samarium-Cobalt magnets. In today’s world Neodymium magnets are now found in iPhones, headphones, electric and hybrid vehicles, wind turbines and more! Neodymium magnets are so popular because of their ability to produce significantly stronger magnetic fields than ferrite or alnico magnets. However, Rare Earth Magnets are very brittle so they are coated and placed in protective chambers to prevent breakage. For comparison the magnetic strength of a common Ferrite (ceramic) fridge magnet is 5000 Gauss, and the magnetic filed produced by Neodymium magnets is upwards of 14,000 Gauss.
How do OEI’s Magnetic Filters Attract both Ferrous and Non-Ferrous Contaminants?
Ferrous materials refer to particles that are made up of iron, nickel or cobalt, and are a conductor of a magnetic field. Our magnets harness the power of ferrous materials and attract them through their magnetic properties.
Non-ferrous material refers to materials that do not contain Iron and are not magnetic. This includes material such as: aluminum & aluminum alloys, gold, magnesium, potassium, manganese, copper, brass, lead, zinc, calcium, silica. However, One Eye Industries products do attract non-ferrous material through the principle of static adhesion. Molecules are typically neutral, meaning they contain the same number of electrons and protons. The adhesive molecular force holds materials together, but when molecules are pressed together and then pulled apart electrons and protons move onto the other material, creating unbalanced molecules that then in turn create static electricity. When ferrous and non-ferrous materials are pushed together and then pulled apart, (static adhesion) this is where OEI is able to capture non-ferrous materials from the creation of the static charge.