Magnet Grades Explained: A Basic Knowledge Guide

The existence of multiple magnet types and their grades often confuse people about which one to select. Wrong selection can make a particular magnet worthless for the specific end application.

This article will curate information on magnet grades, their characteristics, and application suitability to ease your confusion. Sounds exciting? Keep exploring to uncover insights.

Magnet Grades

In most cases, the magnetic strength is an important factor when determining magnet grade. You can use the parameter to determine the magnets performance under various conditions.

Of course, you must evaluate the magnets based on some measurement units – Mega Gauss Oersteds (MGOe). In most cases, the MGOe determine the point at which the magnet is strongest in the demagnetization curve, which is also referred to as the B-H curve.

Wondering what magnetic grade types exist in the market. Get in-depth insights on each one right below:

1. Neodymium Magnet Grades

These magnets are permanent magnets which reflects their longevity. What contributes to the desirability of the Neodymium magnet is commercial applicability and strength.

At times, you may also refer to them as rare-earth magnets.

Key perks that make Neodymium Magnet standout are:

• The magnetic field strength is incredible. It also possesses higher magnetic energy density
• The cost of the Neodymium magnet is very low. It is affordable either in bigger or smaller sizes
• Neodymium magnets resist the phenomenon of demagnetization remarkably

Neodymium Magnet Composition

The principal material of all the Neodymium Magnet grades is Neodymium. Apart from this, they contain multiple materials. Each material in the specific neodymium grade influences the end characteristics. For instance, boron is the bonding agent, dysprosium enhances corrosion resistance etc.

The common ingredients of the Neodymium Magnet are as follows:

• Niobium
• Neodymium
• Boron
• Aluminum
• Dysprosium
• Iron
• Praseodymium
• Cobalt

Neodymium Magnet Grades

The standard grades of neodymium include N35, N40, N45, N50, and so on. You can also read these grades as 35 MGOe or 45MGOe, or 50 MGOe. The unit cost of higher grades is higher than lower grades. Common Neodymium magnets grades are:

1. N-30H Magnet

For high magnetic field at affordable cost, you can try the N-30H magnets. These magnets have 30 MGOe with varying intrinsic coercivity.  The working temperature for theN-30H grade is about 120 °C while the Curie temperature ranges from 320°C to 340 °C.

Additionally, there is the N-30SH with maximum working temperature is 150°C.

2. N-33 Magnets

Another class neodymium magnet grade is the N-33. Their strength is about 3% higher than the N-30 magnets. These magnets strength is about 33 MGOe.

Additionally, they come in vary many options with varying working temperature conditions as you will see in the magnets grades chart below:

Neodymium Magnet Information	Maximum Working Temperature (°C)
N-33M	100
N-33H	120
N-33SH	150
N-33UH	180
N-33EH	200
N-33AH	240

 

3. N-35 Magnets

With reasonable magnetic strength of about 35 MGOe, the N-35 magnet grade offers exceptional performance in many applications. They are available in many sides.

The magnet offers many options with varying temperature characteristics such as:

Neodymium Magnet Information	Maximum Working Temperature (°C)
N-35	80
N35M	100
N-35H	120
N-35SH	150
N-35UH	180
N-35EH	200
N-35AH	240

 

4. N-38 Magnets

Whether you want N38 neodymium disc magnet or grade N38 industrial magnets, these rare-earth magnets are available in varying temperature range. Their strength is rated at 38 MGOe.

Neodymium Magnet Information	Maximum Working Temperature (°C)
N-38	80
N-38H	120
N-38SH	150
N-38UH	180
N-38EH	200

 

5. N-40 Magnets

These magnets come as N40 neodymium block magnets, or N40 neodymium disc magnets available in various sizes depending on specific application requirements. Their strength is about 40 MGOe, with varying working temperature as indicate din the table below:

Neodymium Magnet Information	Maximum Working Temperature (°C)
N-40	80
N-40M	100
N-40H	120
N-40SH	150
N-40UH	180

 

6. N-42 Magnets

The Grade N42 features higher power and has wide adaptation, especially for industries. Main applications for this magnet grade include electric motors, and machinery, which require substantial power.

Their strength is about 42 MGOe with varying temperature condition as indicated in the table below:

Neodymium Magnet Information	Maximum Working Temperature (°C)
N-42	80
N-42M	100
N-42H	120
N-42SH	150
N-42UH	180

 

7. N-45 Magnets

As you can see in the magnets grade chart below, the N-45 magnets offer a range of temperature working conditions from 80 to 150 degrees Celsius. Their strength is 44 MGOe. They are relatively strong magnets available as N45 neodymium rod magnets, N45 disc neodymium magnets, N45 bock magnets, etc.

Neodymium Magnet Information	Maximum Working Temperature (°C)
N-45	80
N-45M	100
N-45H	120
N-45SH	150

 

8. N-48 Magnets

The N-48 magnets are another strong rare-earth magnets with 48 MGOe. Their working temperature varies from 80 to 120 degrees Celsius depending on the grade. They are suitable for many applications including the N48 industrial magnets, N48 cylinder magnets, or N48 disc magnets.

Neodymium Magnet Information	Maximum Working Temperature (°C)
N-48	80
N-48M	100
N-48H	120

 

9. N-50 Magnets

The strength is approximately 50 MGOe. The magnets are available as N50 neodymium disc, grade N50 industrial magnets, and N50 block magnets, just to mention a few.

10. N-52 Magnets

This magnet caters to the highest-strength magnetic fields. The key application areas of this particular magnet grade are generators and electric motors. This rare-earth magnet grade strength is approximately 52 MGOe.

11. N-55 Magnets

Among the available neodymium magnet grades, the N55 is the strongest with 52 MGOe. The N55 magnets are available as discs. They are known as some of the powerful industrial N55 neodymium magnets.

They are popular high grades of rare earth magnets know for high performance applications.

Summary of Margents Grades Chart for Neodymium

 

Sr. No.	Neodymium Grade	Remanence (Br)			Coercive Force			Intrinsic Coercive Force			Maximum Energy Product
		kG	T	kOe		kA/m	kOe		kA/m	MGOe		kJ/m3
Maximum Operating Temperature 80°C / 176°F
1	N33	11.8 – 12.3	1.18 – 1.23	10.9		868	12		955	33 -36		263 – 287
2	N35	12.3 – 12.6	1.23 – 1.26	11.3		899	12		955	35 -39		287 – 311
3	N38	12.6 – 12.9	1.26 – 1.29	11.4		907	12		955	38 -41		302 – 327
4	N40	12.9 – 13.3	1.29 – 1.33	11.5		915	12		955	40 -43		318 – 342
5	N42	13.3 – 13.7	1.33 – 1.37	11		876	12		955	43 -46		342 – 366
6	N45	13.7 – 14.1	1.37 – 1.41	10.5		836	12		955	45 -49		358 – 390
7	N48	14,0 – 14.5	1.40 – 1.45	10.5		836	11		876	47 -51		374 – 406
8	N50	14.4 – 14.8	1.44 – 1.48	10.5		836	11		876	49 53		390 – 422
9	N52	14.5 – 15.2	1.45 – 1.52	12.2		971	13		1,035	52 -56		414 – 446

 

Sr. No.	Neodymium Grade	Remanance (Br)			Coercive Force			Intrinsic Coercive Force			Maximum Energy Product
		kG	T	kOe		kA/m	kOe		kA/m	MGOe		kJ/m3
Maximum Operating Temperature 100°C / 212°F
1	N33M	11.3 – 11.8	1.13 – 1.18	10.5		836	14		1,114	31 34		247 – 271
2	N35M	11.8 – 12.3	1.18 – 1.23	10.9		868	14		1,114	34 36		263 – 287
3	N38M	12.3 – 12.6	1.23 – 1.26	11.3		899	14		1,114	36 39		287 – 311
4	N40M	12.6 – 12.9	1.26 – 1.29	11.6		923	14		1,114	38 41		302 – 327
5	N42M	12.9 – 13.3	1.29 – 1.33	12		955	14		1,114	40 43		318 – 342
6	N45M	13.3 – 13.7	1.33 – 1.37	12.5		995	14		1,114	43 46		342 – 366
7	N48M	13.7 – 14.1	1.37 – 1.41	12.9		1,027	14		1,114	45 49		358 – 390

 

Sr. No.	Neodymium Grade	Remanance (Br)			Coercive Force			Intrinsic Coercive Force			Maximum Energy Product
		kG	T	kOe		kA/m	kOe		kA/m	MGOe		kJ/m3
Maximum Operating Temperature 120°C / 248°F
1	N30H	10.8 – 11.3	1.08 – 1.13	10		796	17		1,353	28 31		223 – 247
2	N33H	11.3 – 11.8	1.13 – 1.18	10.5		836	17		1,353	31 34		247 – 271
3	N35H	11.8 – 12.3	1.18 – 1.23	10.9		868	17		1,353	34 36		263 – 287
4	N38H	12.3 – 12.6	1.23 – 1.26	11.3		899	17		1,353	36 39		287 – 311
5	N40H	12.6 – 12.9	1.26 – 1.29	11.6		923	17		1,353	38 41		302 – 327
6	N42H	12.9 – 13.3	1.29 – 1.33	12		955	17		1,353	40 43		318 – 342
7	N45H	13.3 – 13.7	1.3 – 1.37	12.3		979	17		1,353	43 46		342-366
8	N48H	13.7 – 14.1	1.37 – 1.41	12.5		995	17		1,353	45 49		358-390

 

Sr. No.	Neodymium Grade	Remanance (Br)			Coercive Force			Intrinsic Coercive Force			Maximum Energy Product
		kG	T	kOe		kA/m	kOe		kA/m	MGOe		kJ/m3
Maximum Operating Temperature 150°C / 302°F
1	N30SH	10.8 – 11.4	1.08 – 1.14	10.1		804	20		1,592	28 31		223 – 247
2	N33SH	11.4 – 11.8	1.14 – 1.18	10.6		844	20		1,592	31 34		247 – 271
3	N35SH	11.8 – 12.3	1.18 – 1.23	11		876	20		1,592	33 36		263 – 287
4	N38SH	12.3 – 12.6	1.23 – 1.26	11.4		907	20		1,592	36 39		287 – 311
5	N40SH	12.6 – 12.9	1.26 – 1.29	11.6		939	20		1,592	38 41		302 – 326
6	N42SH	12.9 – 13.3	1.29 – 1.33	12.4		987	20		1,592	40 43		318 – 342
7	N45SH	13.3 – 13.7	1.33 – 1.37	13		1,003	20		1,592	42 – 46		334 – 366

 

Sr. No.	Neodymium Grade	Remanance (Br)			Coercive Force			Intrinsic Coercive Force			Maximum Energy Product
		kG	T	kOe		kA/m	kOe		kA/m	MGOe		kJ/m3
Maximum Operating Temperature 180°C / 356°F
1	N33UH	11.4 – 11.8	1.14 – 1.18	10.7		852	25		1,989	31 34		247 – 271
2	N35UH	11.8 – 12.3	1.18 – 1.23	10.8		860	25		1,989	33 36		263 – 287
3	N38UH	12.3 – 12.6	1.23 – 1.26	11.3		899	25		1,989	36 39		287 311
4	N40UH	12.5 – 12.9	1.25 – 1.29	11.4		907	25		1,989	38 41		302 – 326
5	N42UH	12.8 – 13.3	1.28 – 1.33	11.6		923	25		1,989	40 43		318 – 342
Maximum Operating Temperature 200°C / 392°F
1	N33EH	11.4 – 11.8	1.14 – 1.18	10.3		820	30		2,388	31 34		247 – 271
2	N35EH	11.7 – 12.3	1.17 – 1.23	10.5		836	30		2,388	33 36		263 – 287
3	N38EH	12.2- 12.6	1.22 – 1.26	11.3		899	30		2,388	35 39		278 – 311
Maximum Operating Temperature 230°C / 446°F
1	N33AH	11.3 – 11.8	1.13 – 1.18	10.3		820	33		2,625	31 34		247 – 271
2	N35AH	11.7 – 12.3	1.17 – 1.23	10.5		836	33		2,625	33 36		263 – 287

 

Which One Are Strongest Neodymium Grades?

Among the strongest Neodymium grades, there lies N55. The main reason they are the strongest is their high Br, which lies in the range of 14.4 up to 14.6. The cost of N55 is far more than the other grades. This grade is mainly suitable for applications where power has more weight than the price.

 

Applications of Neodymium Magnets

Some of the key applications for your reference are:

• As magnetic closures in various home accessories
• Magnetic Resonance Imaging (MRI) machines
• Magnetic Therapy
• Cell Phones
• Dentures
• Space Technology
• Hard Drives
• Sound Equipment
• Clothing Industry and Clothing accessories

More Resources:

• Neodymium Magnets – Source: BeMagnet
• NdFeB Magnets – Source: Wikipedia
• Rare-earth Magnets – Source: Magnet Source

2. Samarium Cobalt Magnet Grades

Samarium Cobalt Magnets are those that lie in the rare earth magnets category. It contains two principal elements in its composition cobalt and samarium. These magnets are popular for their excellent magnetic characteristics and refer to strong permanent magnets.

Some unique features include

• Capable of coping with a wider range of temperatures. You can work with these magnets at a temperature of up to 500⁰C
• Unmatchable resistance to corrosion as well as oxidation
• These magnets highly resist loss of magnetization

Common Composition of Samarium Cobalt Magnet

The key ingredients that play a major role in the composition of the Samarium Cobalt Magnet are:

• Samarium
• Iron
• Copper
• Hafnium
• Zirconium
• Cobalt

You can add any percentage of the particular material from the above list in the specific magnet grade. This helps induce the properties of that specific material in the end magnet grade.

Common Samarium Magnetic Grades

 

There are two main types of samarium cobalt magnet exists. One refers to the SmCo 1:5, and the other is SmCo 2:17. The SmCo 1:5 allow you to create intricate and complex shapes. While the SmCo 2:17 allow you to create bigger shapes. As this is highly brittle and not good at intricate shapes formation. Find out more about these types in the following sections:

1. SmCo 1:5

The SmCo 1:5 magnets refer to the magnets that contain one samarium atom and five cobalt atoms. This type is an older variation of the samarium cobalt magnets. These magnets are comparatively weaker than SmCo 2:17 type. But these magnets are not brittle and offer easy machining into complex and smaller components. SmCo 1:5 because of no iron content features high rust resistance. You can work with these magnets up to a temperature of 250⁰C.

2. SmCo 2:17

SmCo 2:17 lies among the latest variation among samarium cobalt magnets. The composition of these magnets contains two samarium atoms and 17 cobalt atoms. You can work with these magnets in temperatures up to 3500C. Higher temperature support means they are suitable for ovens, engines, and machinery components. These magnets do not feature easy loss in demagnetization. Rather it highly resists demagnetization.

Other Grades and Their Characteristics

Sr. No.	Samarium Cobalt 1:5	Remanance (Br)		Coercive Force		Intrinsic Coercive Force		Maximum Energy Product
		kG	T	kOe	kA/m	kG	T	kOe	kA/m
Maximum Operating Temperature 250°C / 482°F
1	SC – 1615	7.7 – 8.6	0.77 – 0.86	7.7 8.3	613 – 664	15	1,194	15 18	120 – 143
2	SC – 1819	8.3 8.9	0.83 – 0.89	8.0 8.6	640 688	19	1,520	17 19	136 – 152
3	SC – 2019	8.7 9.3	0.87 – 0.93	8.3 8.9	664 712	19	1,520	19 21	136 – 168
4	SC – 2219	9.2 9.8	0.92 – 0.98	8.6 9.4	688 755	16	1,280	21 23	168 – 184
5	SC – 2416	9,7 – 10.3	0.97 – 1.03	9.1 9.9	728 – 792	16	1,280	23 25	184 – 200

 

Sr. No.	Samarium Cobalt 2:17	Remanance (Br)		Coercive Force		Intrinsic Coercive Force		Maximum Energy Product
		kG	T	kOe	kA/m	kG	T	kOe	kA/m
Maximum Operating Temperature 300°C / 572°F
1	SC – 2228	9.4 10.0	0.94 – 1.0	9.0 9.8	720 784	28	2,240	21 23	168 – 184
2	SC – 2428	10.0 – 10.6	1.0 – 1.06	9.2 – 10.0	736 – 800	28	2,240	23 25	192 – 208

 

Sr. No.	Samarium Cobalt 2:17	Remanance (Br)		Coercive Force		Intrinsic Coercive Force		Maximum Energy Product
		kG	T	kOe	kA/m	kG	T	kOe	kA/m
Maximum Operating Temperature 350°C / 662°F
1	SC – 2618	10.5 – 10.9	1.03 – 1.09	9.3 10.3	744 824	18	1,440	25 27	200 – 216
2	SC – 2826	10.7 – 11.3	1,07 – 1.13	9.4 10.6	752 848	26	2,080	27 29	216 – 232
3	SC – 3018	11.0 – 11.6	1.10 – 1.16	8.9 10.1	712 808	18	1,440	29 31	232 – 248
4	SC – 3215	11.2 – 11.8	1.12 – 1.18	8.9 10.1	712 – 808	15	1,200	30 32	248 – 256

 

Which One is Strongest Samarium Cobalt Magnet Grades?

The most common and effective grade among samarium cobalt magnet grades is SmCo 2:17. These magnets feature higher magnetism and higher coercivity. Apart from this, because of their lower iron content possession, they feature excellent corrosion resistance. With a nickel coating, you can even eliminate this phenomenon.

Applications of Samarium Cobalt Magnets

Several applications’ suitability adds up to the worth of Samarium Cobalt Magnets. Some of the key applications for your consideration are:

• Machinery Pumps
• High-Performance Motors
• Magnetic Couplings
• Medical Devices
• Magnetic Separators
• Sensors
• Turbo Machinery
• Actuators
• Generators
• Traveling Wave tubes
• Robotics
• Gyroscopes
• Accelerometers

Apart from the above application, you can also find the wide adaptability of samarium cobalt magnets in the aerospace, military, and automotive industries.

More resources:

• Samarium Cobalt Magnet – Source: Magnet Shop
• SmCo Magnets – Source: Wikipedia
• SmCo Magnet Type – Source: Be Magnet

Alnico Magnet Grades

Alnico magnets mainly come from a combination of aluminum, nickel, and cobalt as principal materials. Different Alnico magnets contain fewer other elements depending on the specific grade. Alnico magnets mainly come in two forms one is isotropic, non-directional, and the second is anisotropic, mono-directional. Some of the notable benefits of the Alnico magnets are:

• You can get remarkable temperature stability when it comes to Alnico magnet grades. Alnico magnets work effectively even at 1000⁰
• Alnico magnets are not going to rust
• You can draw complex and smaller shapes from Alnico magnets
• Alnico magnets feature higher residual induction

Alnico Magnet Composition

 

Each Alnico magnet grade utilizes specific composition of elements in its manufacturing. The property of that specific element influences the overall properties of the Alnico magnet grade. The common ingredients of the Alnico magnet are:

• Aluminum
• Nickle
• Cobalt
• Copper
• Titanium
• Niobium
• Iron

Common Alnico Magnetic Grades

As mentioned above, there are two forms of the Alnico magnets exist. One refers to the isotropic Alnico magnets. The feature of this type is that you can magnetize it in the way or direction you want. On the other hand, anisotropic alnico magnets do not allow you to magnetize them in any direction. Rather they feature magnetization in a single direction.

Sintered Alnico Magnets

The sintered Alnico has a lower level of magnetism than the cast Alnico magnets. They allow you to develop more complex and intricate shapes from them. The cost of sintered Alnico magnets is comparatively lower. So, these magnets are the best fit for low-budget projects. Sintered Alnico can work remarkably over higher temperatures such as 450⁰C or 840⁰F.

Cast Alnico Magnets

Cast Alnico magnets, as the name reflects, form due to the casting technique. They follow multiple heat treatment processes to end magnet formation. The cast alnico magnets’ magnetic field is far stronger than the sintered alnico magnets. When you compare the cost of the two, the sintered alnico is a clear winner. These magnets can withstand temperatures of around 525⁰C up to 977⁰F.

1. Alnico 2

Alnico 2 Magnets are sintered or cast magnets available in different shapes and designs. For example, you can choose Alnico 2 cast bar magnet for your guitar pick up.

Their working temperature is about 450°C. Of course, this applies to both cast and sintered Alnico magnets.

2. Alnico 3

Just like the Alnico 2, the working temperature of Alnico 3 Magnets is 450°C. Usually, this is common with the cast Alnico 3 magnets.

3. Alnico 5

Alnico 5 magnets are stronger than both Alnico 2 magnets and Alnico 3 magnets. When used as guitar pick up, it produces edgy tone which is also more aggressive.

Like the first three magnets, their maximum operating temperature is 450°C, especially for the sintered Alnico 5 magnets.

On the other hand, cast Alnico 5 magnets have a maximum temperature of 525°C, just like the alnico 5DG.

4. Alnico 6

In most case, both sintered and cast Alnico 6 magnets have maximum working temperature of 525°C.

5. Alnico 8

For both cast and sintered Alnico 8 magnets, the working temperature is 555°C. It is the highest working temperature for Alnico magnets.

6. Alnico 9

Like Alnico 8, both cast and sintered Alnico 9 magnets have the highest operating temperature, which is 555°C.

For a more detailed specifications, check the magnet grade chart below:

Other Grades and Their Characteristics

 

Sr. No.	Sintered Alnico Magnet Grades	Residual Induction Br		Coercive Force Hc		Intrinsic Coercive Force Hci		Maximum Energy Product (BH)max		Max. Operating Temp.*
		Nominal		Nominal		Minimum		Nominal		Nominal
		k-Gauss	Tesla	Oersted	kA/m	Oersted	kA/m	MGOe	kJ/m3	°C	°F
Maximum Operating Temperature 450°C / 840°F
1	Alnico 2	7.0	0.7	500	40	540	43	1.5	12	450°C	840°F
2	Alnico 5	11.0	1.1	600	48	600	48	4.25	34	450°C	840°F
3	Alnico 8	8.8	0.88	1,530	121	1.600	127	5.25	42	450°C	840°F

 

Sr. No.	Cast Alnico Magnet Grades	Residual Induction Br		Coercive Force Hc		Intrinsic Coercive Force Hci		Maximum Energy Product (BH)max		Max. Operating Temp.*
		Nominal		Nominal		Minimum		Nominal		Nominal
		k-Gauss	Tesla	Oersted	kA/m	Oersted	kA/m	MGOe	kJ/m3	°C	°F
Maximum Operating Temperature 500°C / 932°F
1	Alnico 5	12.2	1.22	600	48	630	50	5.0	40	500°C	930°F
2	Alnico 5B	12.2	1.22	650	52	660	53	5.5	44	500°C	930°F
3	Alnico 5 DG	12.5	1.25	690	55	700	56	6.5	52	500°C	930°F
Maximum Operating Temperature 525°C / 977°F
4	Alnico 5-7	13.0	1.3	700	56	740	59	7.5	60	525°C	980°F
5	Alnico 8-HC	7.0	0.7	1,750	139	1,750	139	4.5	36	525°C	980°F
6	Alnico 8	8.2	0.82	1,500	119	1,600	127	5.0	40	525°C	980°F
7	Alnico 8B	8.8	0.88	1,500	119	1,650	131	5.5	44	525°C	980°F
8	Alnico 8C	9.0	0.9	1,380	110	1,440	115	7.5	60	525°C	980°F
9	Alnico 9	10.5	1.05	1,410	112	1,440	139	9.0	72	525°C	980°F

 

Which One is Strongest Alnico Magnet Grades?

The strongest Alnico magnet grade lies among the cast Alnico magnets. It refers to the anisotropic cast alnico 9 with a Br of around 9.0. The only drawback of this Alnico Magnet Grade is the higher cost association. But the thing that makes it strongest among other alnico magnet grades is the magnetization power.

Applications of Alnico Magnet

Because of the higher temperature compatibility, Alnico magnets have wide adaptability in many applications. Some of the key applications are:

• Guitar pickups
• Sensors
• Bearings
• Heat treatment jigs
• Military Applications
• Traveling wave tubes
• Aerospace applications
• Engineering sector applications
• Microphones
• Electric motors

More resources:

• Alnico Magnets – Source: Be Magnet
• What are Alnico Magnets – Source: IQS Directory
• Alnico – Source: Wikipedia

4. Ferrite Magnet Grades

 

Another name for ferrite magnets is ceramic magnets. A Ferrite magnet is a magnet that results in mixing iron oxide as a principal material. It also utilizes other element proportions in smaller quantities and then subjects them to firing.

When you need an effective permanent magnet specifically at a lower cost, the Ferrite magnet is your choice. You can carry out hassle-free mass production utilizing these magnets. A few benefits that you need to consider regarding ferrite magnets are:

• Incredible oxidation resistance, you don’t need to put extra coating or subject it to surface treatment for longevity
• The cost of this magnet is comparatively cheaper than the other magnet grades
• Features higher stability when it comes to the magnetization of the ferrite magnets
• You can use ferrite magnets outdoors as they resist heat/moisture actively

Key Elements in Ferrite Magnet

There are multiple ingredients exist in making up a ferrite magnet. Some of the key ingredients that add up to the overall worth of a ferrite magnet include:

• Iron Oxide
• Strontium
• Barium
• Manganese
• Zinc
• Nickle

Common Magnetic Grades

The grades of ferrite magnets start from the lower level such as Y8T, and go higher up to Y40. The most common ferrite magnet grade among all is the Y30. Get insights on this ferrite magnet grade in the following section:

1. Y30

There are multiple reasons which contribute to the popularity of the ferrite magnet. Some key reasons are lower cost, high-level magnetism, and better coercivity.

When classifying different magnet grades, you can also refer to this magnet as:

• C5 magnet
• Feroba 2 magnet
• HF26/18
• Fer2

Usually, this magnet is suitable for most general applications.

2. Y30H-1

These types of ceramic magnet grades are also called:

• C8/C8A
• Feroba 3

Unlike the C5, Y30H-1 has higher Hc and Hci. It is common for most sound systems such as loudspeakers. Alternatively, you may use the Y30H-1 in motors.

Additionally, these ferrite magnet grades can resist demagnetization.

3. Y10T

These magnet grades are also called the C1 or Y8T. In most cases, these ceramic magnet grades have small size. However, they are known to be very weak magnets.

The Y10T magnets are suitable for speaker and motor applications besides. Additionally, they can withstand high temperature applications.

4. Y8T

Y8T ceramic magnet is made mainly from strontium carbonate combined with iron dioxide. These ceramic grade magnets feature a combination of high energy yet low cost options. Additionally, they also resist demagnetization.

5. Y20

Ceramic permanent magnet Y20 is combination of ceramic, barium ferrite and strontium ferrite. This magnet plays an important role in many applications such as electronic and automotive industry. The magnet is available in both isotropic and anisotropic versions.

6. Y22H

Y22H ferrite magnets are high energy and low cost magnets suitable for manufacturing electronic equipment such as speakers, motors, etc. Additionally, they are also resistant to demagnetization.

7. Y25

Y25 ferrite magnet is suitable for high temperature applications. It combines the desirable features of low cost, high energy and light weight. In fact, it shares most properties with the Y26H which is popular for Hall Effect devices manufacturing.

8. Y33

Another name for these Ferritic magnet grade is the C7 or Y26-2. Their composition is manly iron oxide and strontium ferrite.

9. Y33H

You can also refer to this ceramic magnet grade as the C10 magnet.

10. Y34

The Y34 ferrite magnet grade is also called C11. They are common in low frequency driver systems.

11. Y35

Y35 described by the SJ285-77. These magnets are lightweight and available as rings, bars, etc.

For more information, you will find the information in ferrite magnet grade chart below:

Other Grades and Their Characteristics

 

Sr. No.

Ferrite Magnet Grades

Remanance (Br)

Coercive Force

Intrinsic Coercive Force

Maximum Energy Product

kG

T

kOe

kA/m

kOe

kA/m

MGOe

kJ/m3

Maximum Operating Temperature 100°C / 212°F

1

Y8T

2.0 – 2.35

0.20 – 0.235

1.57 – 2.01

125 – 160

2.64 – 3.52

210 – 280

0.8 – 1.2

6.5 – 9.5

2

Y10T

2.0 – 2.35

0.20 – 0.235

1.61 – 2.01

128 – 160

2.64 – 3.52

210 – 280

0.8 – 1.2

6.4 – 9.6

3

Y20

3.2 – 3.8

0.32 – 0.38

1.70 – 2.39

135 – 190

1.76 – 2.45

140 – 195

2.3 – 2.8

18 – 22

4

Y22H

3.1 – 3.6

0.31 – 0.36

2.76 – 3.14

220 – 250

3.52 – 4.02

280 – 320

2.5 – 3.0

20 – 24

5

Y23

3.2 – 3.7

0.32 – 0.37

2.14 – 2.39

170 – 190

2.39 – 2.89

190 230

2.5 – 3.2

20 – 25

6

Y25

3.6 – 4.0

0.36 – 0.40

1.70 – 2.14

135 – 170

1.76 – 2.51

140 – 200

2.8 – 3.5

22.5 – 28

7

Y26H

3.6 – 3.9

0.36 – 0.39

2.76 – 3.14

220 – 250

2.83 – 3.20

225 – 255

2.9 – 3.5

23 – 28

8

Y26H-1

3.6 – 3.9

0.36 – 0.39

2.51 – 3.14

200 – 250

2.83 – 3.20

255 – 255

2.9 – 3.5

23 – 28

9

Y26H-2

3.6 – 3.8

0.36 – 0.38

3.30 – 3.62

263 – 288

4.0 – 4.40

318 – 350

3.0 – 3.5

24 – 28

10

Y27H

3.7 – 4.0

0.37 – 0.40

2.58 – 3.14

205 250

2.64 – 3.20

210 – 255

3.1 – 3.6

25 – 29

11

Y28

3.7 – 4.0

0.37 – 0.40

2.20 – 2.64

175 210

2.26 – 2.76

180 – 220

3.3 – 3.8

26 – 30

12

Y28H-1

3.8 – 4.0

0.38 – 0.40

3.02 – 3.27

240 260

3.14 – 3.52

250 – 280

3.4 – 3.8

27 – 30

13

Y28H-2

3.3 – 3.8

0.33 – 0.38

3.41 – 3.71

271 295

4.80 – 5.09

382 – 405

3.3 – 3.8

26 – 30

14

Y30

3.7 – 4.0

0.37 – 0.40

2.20 – 2.64

175 210

2.26 – 2.76

180 – 220

3.3 – 3.8

26 – 30

15

Y30BH

3.8 – 3.9

0.38 – 0.39

2.80 – 2.95

223 235

2.90 – 3.08

231 – 245

3.4 – 3.8

27 – s30

 

Sr. No.

Ferrite Magnet Grades

Remanance (Br)

Coercive Force

Intrinsic Coercive Force

Maximum Energy Product

kG

T

kOe

kA/m

kOe

kA/m

MGOe

kJ/m3

Maximum Operating Temperature 100°C / 212°F

1

Y30H-1

3.8 – 4.0

0.38 – 0.40

2.89 – 3.46

230 – 275

2.95 – 3.64

235 – 290

3.4 – 4.0

27 – 32

2

H30H-2

3.95 – 4.15

0.395 – 0.415

3.46 – 3.77

275 – 300

3.90 – 4.21

310 – 335

3.4 – 4.1

31 – 34

3

Y32

4.0 – 4.2

0.40 – 0.42

2.01 – 2.39

160 – 190

2.07 – 2.45

165 – 195

3.8 – 4.2

30 – 33.5

4

Y32H-1

4.0 – 4.2

0.40 – 0.42

2.39 – 2.89

190 – 230

2.89 – 3.14

230 – 250

4.0 – 4.4

31.5 – 35

5

Y32H-2

4.0 – 4.4

0.40 – 0.44

2.81 – 3.02

224 – 240

2.89 – 3.14

230 – 250

3.9 – 4.3

31 – 34

6

Y33

4.1 – 4.3

0.41 – 0.43

2.76 – 3.14

220 – 250

2.83 – 3.20

225 – 255

4.0 – 4.4

31.5 – 35

7

Y33H

4.1 – 4.3

0.41 – 0.43

3.14 – 3.39

250 – 270

3.14 – 3.46

250 – 275

4.0 – 4.4

31.5 – 35

8

Y34

4.2 – 4.4

0.42 – 0.44

2.51 – 2.89

200 – 230

2.58 – 2.95

205 – 235

4.1 – 4.5

32.5 – 36

9

Y35

4.3 – 4.5

0.43 – 0.45

2.70 – 3.00

215 – 239

2.74 – 3.03

217 – 241

4.2 – 4.8

33.1 – 38.2

10

Y36

4.3 – 4.5

0.43 – 0.45

3.10 – 3.41

247 – 271

3.14 – 3.44

250 – 274

4.4 – 4.8

35.1 – 38.3

11

Y38

4.4 – 4.6

0.44 – 0.46

3.58 – 3.83

285 – 305

3.69 – 3.90

294 – 310

4.6 – 5.1

36.6 – 40.6

12

Y40

4.4 – 4.6

0.44 – 0.46

4.15 – 4.45

330 – 354

4.27 – 4.52

350 – 360

3.7 – 5.3

37.5 – 41.8

 

Which One is Strongest Ferrite Magnet Grades?

The strongest ferrite magnet grade is Y40. This is because it has a maximum Br among all other grades, which is 4.6.

Ferrite Magnet Uses

• Loudspeakers
• Pot magnets
• Generators, Motors, Alternators
• Facelift Magnets
• Fridge magnets
• Security systems
• Sea searcher devices
• Eddy current devices
• Sweeper Magnets
• Lifting Magnets
• Ferrous contamination removal large-scale magnets

More Resources:

Ferrite Magnets – Source: Be Magnet

Ceramic Magnets – Source: Magnet Shop

What are Ferrite Magnets – Source: First 4 Magnets

What are Ceramic Magnet – Source: IQS Directory

How are Magnets Graded

Learning how to choose a magnet is a critical aspect.

Multiple things need your attention while finalizing the selection of a specific magnet grade selection. Some of the key things that need your attention are:

Maximum Operating Temperature

The operating temperature is a key aspect that needs your attention at first. Determining the temperature range in which you will operate your magnet is essential. This is because the magnets possess higher sensitivity toward temperature fluctuations.

Please note that all magnet grades are not suitable for all temperature ranges. Considering the operating temperature of particular magnet grade before finalizing your selection is essential.

Required Holding Force

The holding force also refers to the magnetic field density. Don’t choose a higher holding force. The optimum force will serve best in this regard. A higher holding force will allow you to experience higher costs and lead to improper operation. If you need 35MGOe, then why choose 40MGOe?

Demagnetizing Resistance

Another thing that you should consider while choosing the specific magnet grade is demagnetizing resistance. Demagnetization results from multiple things, such as high heat, magnetic field, and operating temperature. Negligible or no demagnetization can lead you to an effective and longer operation. Choose the magnet that offers higher resistance to demagnetization. Please note that demagnetization is irreparable.

Adsorptive Power

You can refer to this force as a force that a magnet experiences after attachment to the iron plate. Then experience a strong pull in the magnetization direction. These pulls refer to 1 kilogram-force, equal to the 9.80 Newton. Consider this factor before selecting your particular magnet grade.

Size and Shape

The shapes of the magnet affect the direction of magnetic field lines, and size affect the overall magnetic field strength. Consider the installation place and choose the shape accordingly. Various shapes, such as round, square, segmented, rings etc., exist in magnets. You can also choose the desired level of thickness when it comes to various magnetic grades.

Review Magnet Grade Chart

As you can see in the previous sections, there are many variables determining the grading system. For instance, you will review:

• Magnet strength where you can evaluate magnet materials alongside magnet strength. Generally, neodymium make the strongest magnets on earth. Of course, their strengths also vary as we have illustrated above.

Conclusion

The right size and type of magnet are crucial to ensure the effectiveness and efficiency of the operation. Now you know every magnet type, benefit, application, grade, and characteristic. This will ease your selection process.

For all you magnet grades from China, contact us now.