Magnet Knowledge – Sinoneo Magnets

What are the key considerations for shipping magnets by air?

alloymagnets — Mon, 19 Aug 2024 09:21:37 +0000

When shipping magnets by air, there are several key considerations to keep in mind to ensure safe and compliant transportation. Some important factors include:

Magnetic Field Strength Limits:

According to IATA Dangerous Goods Regulations (DGR), the magnetic field strength of the packaged magnets must be less than 0.00525 gauss (5.25 milligauss) at a distance of 15 feet (4.6 meters) from the package. If the magnetic field exceeds this limit, the package must be labeled as “MAGNETIZED MATERIAL” and follow additional dangerous goods shipping requirements.

Packaging and Shielding:

Magnets must be packaged in a way that reduces the magnetic field strength to the required levels. This often involves using shielding materials like iron sheets or boxes to contain the magnetic field. The packaging must also protect the magnets from damage during transit.

Labeling:

If the magnetic field strength exceeds 0.002 gauss (2 milligauss) at 7 feet (2.1 meters) from the package, the package must be labeled as “MAGNETIZED MATERIAL” . This alerts handlers to the presence of the magnetic materials.

Inspection and Certification:

The magnetic field strength of the packaged magnets must be measured and certified to meet the air shipping requirements. This is typically done by a dangerous goods specialist who will issue an Identification and Classification Report.

Restrictions on Quantity and Size:

There may be restrictions on the total quantity or size of magnets that can be shipped by air. These limits are set by the IATA DGR and should be checked before shipping.

Demagnetization:

In some cases, it may be necessary to demagnetize the magnets to reduce the magnetic field strength to acceptable levels for air transport.

By paying attention to these considerations, shippers can navigate the complexities of shipping magnets by air while prioritizing safety and regulatory compliance. If you’d like more details, feel free to ask!

Overview of Alnico Magnets

alloymagnets — Tue, 23 Feb 2021 09:21:28 +0000

What are Alnico Magnets?

Alnico magnets are permanent magnets fabricated from aluminum, nickel, and cobalt. They are available in isotropic, non-directional, or anisotropic, mono-directional form. Once magnetized, they have 5 to 17 times the magnetic attraction of magnetite or lodestone magnets.

Alnico magnets have a high-temperature coefficient and can be calibrated for prime residual induction to be used in applications with temperatures up to 930°F or 500°C. They’re used where corrosion resistance is critical and for sensors.

Shapes and kinds of Alnico Magnets

Alnico magnets are available in a wide variety of shapes and sizes to fit several applications. They can be found in:

Small toys
Electric guitars
In factories
Industrial applications

The shapes of alnico magnets are produced by sintering or casting with casting being the most common method.

Cylinder:

Cylinder, or rod, magnets are used for seals, sensors, coin collection machines, and guitar pickups.

The concentration of alnico magnets makes them ideal for use in amplifiers, actuators, and motors. Cylinder alnico magnets are used for medical applications due to their strength and ability to be adjusted.

Pot:

Pot, holding, or mounting alnico magnets are used for holding applications and are an alternative to fixture and fastening methods. As mounting magnets, they can be easily removed, unlike permanent fasteners.

Bar:

Bar or block magnets are used in schools for learning activities, like demonstrating a flux. They are the weakest shape due to the little area of the poles but are the most common shape and are used in automation, separation, and holding applications.

Ring:

Ring alnico magnets are circular with a hole in the middle and are sometimes referred to as donut magnets. The placement of their north and south poles depends on how they are polarized. One-half the magnet is the north pole, while the opposite half is the south. They can also be polarized into quarters or eighths.

Ring magnets are used for science experiments and medical applications for people with implanted cardioverter defibrillators, or ICDs, which automatically gives a shock to a patient’s heart when its rhythm becomes irregular. When the ICD malfunctions, it gives a shock to the patient unnecessarily, which results in an irregular rhythm. Placing a ring magnet in a patients’ chest, over the ICD, disables the device when the rhythm is irregular.

Horseshoe:

Horseshoe magnets are bar magnets that are formed into the shape of a U, which makes them stronger because the poles are pointed in the same direction. They can lift metal objects of any size depending on the strength of the magnet.

Alnico Magnet Coatings

Alnico magnets are highly resistant to oxidation and corrosion and do not need a protective coating, plating, or surface protection. They are unaffected by exposure to grease, solvents, gasoline, or alcohol.

Their vulnerability alnico magnets is their iron content. When exposed to water for an extended period of time, they develop surface corrosion. This same weakness can occur if they’re exposed to alkali solutions and inorganic acids.

Though a coating isn’t needed, manufacturers will paint alnico magnets to improve their appearance and hide their natural dark grey color. In the majority of cases, red is the color of choice, but they can be coated with chrome or nickel.

Grades of Alnico Magnets

Alnico magnets are available in several variations with different amounts of aluminum, nickel, and cobalt. The varying percentage of the base metals alters the strength of the magnet, which creates a variation in the magnetic field.

There are 29 grades of alnico magnets with 17 being cast, 10 sintered, and a couple bonded. The grading system is predicated on the magnet’s chemical composition, residual induction, coercive force, maximum energy, the percent of cobalt, and operating temperature. As the operating temperature rises, so does the grade of the magnet.

The majority of alnico magnets are anisotropic, which have the highest power. Below could be a discussion of a view of the alnico grades and their use.

Uses of Alnico Magnets

Alnico magnets are used for applications with high operating temperatures and where a robust static magnet is required, such as electric motors, guitar pickups, microphones, sensors, loudspeakers, and cow magnets.

The high density, magnetic force, and affordable price of alnico magnets makes them the first choice for several applications. They have the lowest temperature coefficient of any form of the magnet at 0.02% per degree of centigrade, which creates temperature stability.

What is Magnetic Tubes?

alloymagnets — Sat, 20 Jun 2020 03:27:37 +0000

What is Magnetic Tubes?

Strong Magnetic tubes, Magnetic tubes filter, Magnetic Rods, Magnetic Bars

Magnetic Tubes are named just because they are made from the strong Neodymium Magnets or SmCo magnets, Ferrite Magnets are in stainless steel tubes by fully or non-fully welding. Because of the appearance of stainless steel rod or bar with well polishing, many customers also call them magnetic rods, magnetic bars, magnetic filter bars, or magnet bar.

They are the most efficient permanent magnetic unit for catching, removing ferrous metals from various materials in different fields. According to a different condition, they can be assembled into grate magnets, magnetic drawer or magnetic trap with other stainless steel parts. There are square, round shape magnetic tubes.

Application of magnetic tubes filter:

Magnetic tubes, magnetic tubes filter may apply in medicines, sanitation, textile, machinery, and foodstuffs. The filer will attract iron/steel substances away from liquids, from among grains or powders.

What about our Magnetic tubes?

Our stainless magnetic tubes are made by the cold rolling stretch process through tools, they are high density, no crack with uniform wall thickness. The magnetic rod or magnetic bar made from these stainless steel tube is well waterproof.

The secondary pollution to materials can be stopped by preventing any liquid or super powder or gas from going to the interior after the tube sides are fully welded and well polished.

On the contrary, the magnetic rods made from welding stainless magnetic tubes may easily fail to prevent secondary pollution because it is more easily crack at the welding joint.

How to order Magnetic tubes?

1. Confirm Shap and dimension of magnetic tubes:

Our standard bars are 25mm. (1 inch) in diameter and any length per customers’ request up to 2500mm…
2. Confirm the magnetic force of magnetic tubes: 2500Gs, or 8000Gs or 10000Gs or 12000Gs or 13000Gs;
3. Confirm the Max working temp:

6 series is available for the customer to choose from

N series up to 80 degrees C
M series up to 100 degrees C
H series up to 120 degrees C
SH series up to 150 degrees C
UH series up to 180 degrees C
EH series up to 200 degrees C

4. Confirm the material is abrasive or not ;
5. Confirm the cover of the magnetic tubes:316L or 304 stainless steel.
6.Confirm the threaded Hole of magnetic tubes:
1), Tapped threaded holes at each end for easy installation.
2), Tapped one threaded hole at one end, and the other end is plain welded.
3), Both ends are plain welded.

7. Confirm the quantity of magnetic tubes: Different quantity different prices, more quantity lower price.

MAGNETIC TUBE,MAGNETIC FILTER TUBE

MAGNTIC RODS,MAGNETIC FILTER RODS

HIGH PERFORMANCE FILTER ROD MAGNET 12000 GAUSS

MAGNETIC BOILER FILTER BAR

FOOD INDUSTRY GRADE STAINLESS STEEL MAGNETIC FILTER ROD

PERMANENT MAGNETIC FILTER BARS

What you should know when purchasing magnetic filters rod/bar/tube？

alloymagnets — Wed, 05 Jun 2019 07:53:27 +0000

How magnetic filter rod/bar/tube works?

The magnetic filter rod/bar/tube made of a 304 or 316 stainless steel tube, polar plates,end-plugs, and permanent magnets. The higher the surface gauss of the tube, the higher the price. As the permanent magnets being the most expensive parts, we will tell you how unscrupulous companies reduce costs of manufacturing magnetic tubes with high surface gauss.

1,Reducing the volume of magnets

Disadvantage: Uneven tube surface leading to easy fracturing.
Reduced the diameter of magnets as shown in the diagram below：

Magnetic flux density of magnetic filter rods/bars/tubes consist of smaller magnets will not decrease by increasing the diameter of the polar plates, due to magnetic flux density tests being conducted around the circumference of the plates.

However, due to lack of support from the magnets within the tube, the wall of the tube will collapse in time.

Furthermore, as stress can not be distributed evenly and focused only the plates, the tube fractures easily around the plates, rendering the entire tube unusable and in more severe cases, contaminating the materials as well.

2,Using Chipped And Fractured Magnets

Disadvantage: Uneven surface gauss causing loss of effectiveness easily.
Chipped and fractured magnets are rejects.

However, some unscrupulous companies will seal them in tubes regardless, as these defects are indistinguishable from the external appearance and difficult to detect as well.

3,Using “Second Grade Magnets”

Disadvantage : Tubes with uneven magnetic fields and poor consistency .

The so-called ” second grade magnets ” are magnets made by top-tier manufacturers for top-tier buyers . These products are , however , discarded rejects due to various factors . Due to being high performance products still,some unscrupulous companies will purchase them at discounted prices .

However , these ” second grade magnets ” are mostly thin pieces between 3-10mm thick . When observed with a magnetic polar viewer , these defects will present itself as shown in the following diagram :

Furthermore, these “second grade magnets” have inconsistent sources. As such, there is no guarantee of the performance of the next batch purchased, resulting in poor consistency between batches.

4,Reducing the thickness of the stainless steel tube

Disadvantage: Reduced lifespan of magnetic tubes.
SS304 and SS316 stainless steels are commonly used materials used for manufacturing magnetic filter rods/bars/tubes. In the market, the thinnest SS304 tubes are between 0.45-0.50mm. If the tubes get any thinner, the lifespan of the said tubes will be drastically reduced.

Due to having fewer applications and of less comprehensive specifications, the thinnest SS316 tubes are found to be between 0.75-0.80mm. This is also why magneticfilter rods/bars/tubes made of SS316 have lower surface gauss compared to tubes made of SS304.

Companies are permitted to manufacture 0.5mm thick SS316 tubes (MOQ at 500kg) when there is a demand of stability in batches manufactured. However, some unscrupulous companies will manufacture magnetic tubes with only 0.3mm thick tubes, allowing for higher surface gauss using weaker magnets.

The above mentioned methods are how costs of magnetic separations are reduced unscrupulously. Please exercise caution when purchasing magnetic filter rod/bar/tube products.

How to Design the Size of Magnetic Tube/Magnetic Bar/Magnetic Rod?

alloymagnets — Wed, 08 May 2019 06:27:34 +0000

1. Magnetic filter bar,Magnetic Rods,Magnetic tube(Magnetic Separator) is extremely efficient at removing fine iron contamination from free flowing products such as sugar, grain, tea, flour, Plastic, liquid, granulate and any other type of powder with a low moisture content. As a result, your equipment and facilities will be safe and sound, and your products will be safe for consumption. This item can be supplied with any shape frame or studded end for easy of installation.

2. Magnetic filter bar are particularly useful for those engineers who wish to build their own separator units or have severe room restrictions and are not able to accommodate a conventional unit. All product contact parts are manufactured using stainless steel.

3. The magnetic filter bar with special welding at the both ends without leak forever. Welding energy concentrate on welding line and do not hurt the magnet, maximal protect magnetic filed. The available magnetic area can be expanded to the limited of rod surface and without add any extra magnet. Once welded the rods are finish machined and highly polished.

1. Diameter: Diameters are in a series. The relationship between the diameter and max. gauss value is as below:

	6000Gs	7000Gs	8000Gs	10000Gs	11000Gs	12000Gs
Ø16
Ø19
Ø22
Ø25
Ø28
Ø32
Ø38
Ø50
Ø63
Ø100

* recommended diameter is Ø25mm(1″)

2. Length: Custom and made to any length

How to Calculate Magnetic Field Of Magnetic Filter Bar?

alloymagnets — Mon, 29 Apr 2019 06:00:35 +0000

How to Calculate Magnetic Field Of Magnetic Filter Bar?

Powerful NdFeB Magnetic Filter Bar, Magnet Filters Rods are made from permanent magnets, stainless steel tubes, and metal frames and is used to remove ferrous parts and tramp iron in the field of medicines, textiles, foods, grains, plastics, water, heating solution, etc. The magnets bars can be strong Neodymium magnets, Alnico magnets, and ferrite magnets, etc. There are various outline shapes and handling capacity for your choice.

How to Calculate Magnetic Field of Magnetic Filter bar?

Finite element models can calculate the strength of a magnetic field. It is quite difficult, but practical we use the value below:

Dry Powder	7000-8000 Gauss
Wet Slurry	9000-10000 Gauss
Nanometer Particles	over 12000 Gauss

MAGNETIC TUBE,MAGNETIC FILTER TUBE

MAGNTIC RODS,MAGNETIC FILTER RODS

HIGH PERFORMANCE FILTER ROD MAGNET 12000 GAUSS

MAGNETIC BOILER FILTER BAR

FOOD INDUSTRY GRADE STAINLESS STEEL MAGNETIC FILTER ROD

PERMANENT MAGNETIC FILTER BARS

What is the Magnet Strength of Magnetic Filter Bar?

alloymagnets — Fri, 26 Apr 2019 05:59:35 +0000

Magnetic filter bar,Magnetic Rods,Magnetic Filter tube(Magnetic Separator) is extremely efficient at removing fine iron contamination from free flowing products such as sugar, grain, tea, flour, Plastic, liquid, granulate and any other type of powder with a low moisture content. As a result, your equipment and facilities will be safe and sound, and your products will be safe for consumption. This item can be supplied with any shape frame or studded end for easy of installation.

Per customers’ requirement. The highest is up to 12, 000GS (1.2T).
Following is the relationship between diameter, magnetic strength and Maximum Operation Temperature for reference:

	0.25T	0.5T	0.7T	0.9T	1T	1.1T	1.2T
Φ 19 (0.75″ )	√ EH	√ EH	√ EH	√ H	√ M	–	–
Φ 22 (0.85″ )	√ EH	√ EH	√ EH	√ H	√ M	√ N	–
Φ 25 (1.00″ )	√ EH	√ EH	√ EH	√ SH	√ H	√ M	√ N
Φ 32 (1.25″ )	√ EH	√ EH	√ EH	√ SH	√ H	√ M	√ N
Φ 38 (1.50″ )	√ EH	√ EH	√ EH	√ UH	√ SH	√ H	√ M
Φ 50 (1.75″ )	√ EH	√ EH	√ EH	√ UH	√ SH	√ H	√ M
Φ 76 (3.00″ )	√ EH	√ EH	√ EH	√ UH	√ UH	√ SH	√ H
Φ 100(4.00″ )	√ EH	√ EH	√ EH	√ UH	√ UH	√ SH	√ H

Remarks:
(1).”√”means it can be manufactured on the condition of the diameters listed in the table.”- “means can not be manufactured.

(2). The related Max working temperature from different series.
H series: <=120
SH series: <=150
UH series: <=180
EH series: <=250

(3).Round and square are both available

(4). 304 and 316L stainless steel type are available

(5). Magnetic bar length can be custom made .Max length of is 2500mm when diamteter is 25mm.

(6). Various end design are available ,such as Nail head ,thread hole ,double screw bolt ,etc .

Why the price of the magnets is so big difference on the market?

alloymagnets — Thu, 25 Apr 2019 01:51:13 +0000

When you are need magnets will choose a lot of magnet manufacturers to compare the price. Since there are many comparisons, the price will be different. At this time, you will have questions: Why the price of the the magnets is so big different forthe same specification ? Why is this? Sinoneo magnets tell you the reason.

First, non-manufacturers

It is possible that you are looking for a middleman, not a direct manufacturer. The price is naturally much higher than the price of the direct manufacturer you are looking for. At present, there is a lot of magnet trade. You can ask for a visit and see if the other party is active. Welcome or find reasons to refuse.

Second, the actual requirement is not clear

Some customers are not sure what material they want for their magnets, causing some salesmen to misplace the material and report the wrong price.

Third, the quality of after sales

The quality of the after-sales will also greatly affect the price of the magnet.

Fourth, the cost is different

We know that the common performance of ordinary NdFeB is also commonly used N35, but at present there are many manufacturers using N33, N28 to impersonate, the price will naturally be much cheaper. Sinoneo magnets want to say that each product is quoted for its reasons, if a company wants to survive, it is impossible to survive the cheap and good quality magnet products.

How to choose strong magnetic rods for the food industry?

alloymagnets — Tue, 23 Apr 2019 06:11:10 +0000

Strong magnetic bar is a production equipment that guarantees the safety and quality of products. The ceramic industry and the food industry have been widely used and become one of the production equipments. The strong magnetic rod used in the pharmaceutical and food industries is a permanent magnet magnetic rod that does not require a power source.
The basic principle is that when the iron-containing substance passes, it is attracted by strong magnetic force, and the iron-containing substance is firmly adsorbed on the pipe wall to ensure the integrity of the equipment and the safety of the product.

Divided from the structure, there are two kinds of strong magnetic rods, one is the process equipment connected with other production equipment, such as pipe iron remover, mixed iron remover, etc., the structure is relatively simple; one is the whole machine, such as rotary iron remover, Light powder iron remover. In addition, complete machines with composite functions, such as granulation and iron removal machines, screening and iron removal machines, etc., have appeared on the market.

From the technical function, the magnetic bar has a high, medium and low grade. The magnetic rod iron remover for assembling the magnetic rod with the ferrite magnetic material has the function of removing the ferromagnetic metal foreign matter, and the price is low, which is a low grade.

The magnetic rod is made of rare earth magnetic material, namely neodymium iron boron. NdFeB is divided into different series and grades according to its function. Mid-range iron remover generally uses N48 below NdFeB magnetic material, its field peak is 7000 to 10000 Gauss; Gaussian strong magnetic rod uses N48H, N50 or more magnetic material, the peak value of the table is as high as 12000 Gauss.

Magnetic bars are different from metal detectors. The strong magnetic rod is superior to the latter in that it can remove metal foreign matter in the production process, and the removal method is superior. In order to ensure the safety and quality of products, many large-scale enterprises use both products at the same time.

The selection of strong magnetic rods should be based on the actual and applicable cost requirements. First, it is necessary to determine whether to select process equipment or the whole machine according to the actual conditions of production;

Second, you should choose the grade of the magnetic rod according to the functional requirements. Functional requirements include two aspects – magnetic field strength and removal rate. Export products (such as APIs, food additives) generally require 12000 Gaussian field strength, and the removal rate is related to the number of strong magnetic bars or magnetic plates. The more layers, the higher the removal rate. If you only remove iron debris, you can choose a low-grade iron remover.

Third, According to the shape and fluidity of the material, the magnetic field structure of the iron remover is selected, mainly the magnetic rod and magnetic plate spacing. If the material is very fluid, use a rotating or vibrating magnetic rod.

Fourth, the material flux of the iron remover should be selected according to the production volume.

Fifth, Determine the three-dimensional size of the strong magnetic bar according to the on-site space where the iron remover is installed. Six also consider how the iron separator is connected to other production equipment.

How to Solve The Iron Slag Troubles For You?

alloymagnets — Wed, 03 Apr 2019 06:03:29 +0000

The material will be mixed with a lot of iron impurities, which has become a headache for the manufacturers. To solve the problem of iron filings, Sinoneo magnetic bar providing reliable iron slag solutions and tailoring various strong magnetic bars.

The headache of the manufacturer is that the material is not clean and the product can not pass the quality inspection. This is a common problem.

This is the pain point of the manufacturers mentioned at the beginning of this article. Every time the iron products removed from the purchase can not filter the iron slag, the product can not pass the quality inspection, how to change the situation,so that It can reduce the production cost and quickly solve the problem.

It is necessary to mention the key points, how to find a good magnetic filter bar manufacturer!

Purchasing a strong magnetic bar not only depends on the price, but also on the quality! The low-priced strong magnetic bar, the magnet with the refurbished magnetic material or the magnetic core is not the same size, the strong NdFeB magnet is replaced by the ferrite magnet, which leads to the price of magnetic bar is different on the market.

How do you know the difference between good and bad magnetic bars?

Sinoneo Magnets magnetic bar manufacturers master to give you some suggestions:

First, starting from the appearance, how to weld the two ends of the magnetic bar, whether there is strict welding, can not enter the water, if found to be able to enter the water phenomenon, which means that this magnetic bar is not a good magnetic bar, can not be used.

Second, starting from the magnetic line, holding the magnetic rod to roll a few times in the ground, the magnetic line will come out, then you can use the Gauss meter to measure the magnetic force, confirm if you can meet your requirements.

Third, starting from the size of the specifications, using a special tool to measure the diameter of the strong magnetic bar has not reached the size of the order at the time, the deviation is not serious, these all indicate the strength of the manufacturer and the attitude of doing things.

Once you know this, go and tell your company’s purchasing staff, you have the ideas to reduce production costs and make the materials more pure.

Strong magnetic rod manufacturers: Sinoneo magnets focus on providing filter iron slag solutions, let us help you!