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NAME:Sintered NdFeB Magnets

TOPMAG magnets are primarily made of iron, boron, and rare earth elements (principally neodymium), are the worlds strongest and highest-performance magnets.TOPMAG has made possible smaller and more advanced electronic devices than ever before.

TOPMAG was a pioneer in the field of magnetic technology. and has continuously met industry's needs for advanced magnets and technology, including reliable surface processing techniques. With TOPMAG, we created a new class of mass-produced magnet, and the N55 series has been successful in development and can be produced in small batches.

product overview
specification sheets and downloads

NdFeB Magnet have corrosion potential and are easily oxidized in the normal temperature. In order to overcome this weakness while maximize magnetisiom of NdFeB sintered magnet.there is a great need of plating film with high corrosion resistance environmentally.Moreover, the magnet's reliability has been improved considerably due to the application of surface treatment technologies such as aluminum and nickel coating. When it comes to surface treatment, greater importance is now attached not only to corrosion-resistance performance but also to such factors as adhesive durability andinsulation quality, the requirements for magnets used in motors. These products are used by customers with confidence.

In order to increase the corosion resistance of the magnets and to meet the designated surface demands,we have developed its own plating solutions and apply them different magnet related products and provided magnets with the following coating layers.

Surface Treatment		Coating Thickness (µm)	Moisture Resistance	Salt water Resistance	Bonding Durability	Nsulation Proof	Dimensional Accuracy
Aluminum	Pure Aluminum Coating	5～30	〇		〇		〇
Aluminum	aluminized barrier coating	8～25	●	●	〇		〇
Nickel Coating		8～30	〇	●
Gold Coating		10～25	●	●	〇		〇
Modified epoxy		5～25	●	●		〇
Electro-Deposition Coating		—	●			〇
Hybrid Parylene		5～100	●	●		〇	〇
Phosphorization		2-50					〇

● Excellent 〇good

The coating thickness shown above is a standard value and the optimum coating thickness varies depending on service conditions and other factors.

Our surface treatment technology is in compliance with international environmental standards, such as the RoHS directive and the ELV directive.

If you need surface treatment, please let us know before hand because we have to choose appropriate treatment processes and product types according to applications, the specific usage environment and required characteristics.

Magnetic and Physical Properties

Grade	Residual Induction (Br)		Coercive Force (Hcb)		Intrinsic Coercive Force (Hcj)		Max. Energy Product (BH)max		Max.Operating TEMP
Grade	Mt	KGs	KA/m	Koe	KA/m	Koe	KJ/m	MGOe	℃
N27	1030-1080	10.3-10.8	≥ 796	≥ 10.0	≥ 955	≥ 12	199-231	25-29	80 ℃
N30	1080-1130	10.8-11.3	≥ 796	≥ 10.0	≥ 955	≥ 12	223-247	28-31	80 ℃
N33	1130-1170	11.3-11.7	≥ 836	≥ 10.5	≥ 955	≥ 12	247-271	31-34	80 ℃
N35	1170-1220	11.7-12.2	≥ 868	≥ 10.9	≥ 955	≥ 12	263-287	33-36	80 ℃
N38	1220-1250	12.2-12.5	≥ 899	≥ 11.3	≥ 955	≥ 12	287-310	36-39	80 ℃
N40	1250-1280	12.5-12.8	≥ 907	≥ 11.4	≥ 955	≥ 12	302-326	38-41	80 ℃
N42	1280-1320	12.8-13.2	≥ 915	≥ 11.5	≥ 955	≥ 12	318-342	40-43	80 ℃
N45	1320-1380	13.2-13.8	≥ 923	≥ 11.6	≥ 955	≥ 12	342-366	43-46	80 ℃
N48	1380-1420	13.8-14.2	≥ 923	≥ 11.6	≥ 876	≥ 12	366-390	46-49	80 ℃
N50	1400-1450	14.0-14.5	≥ 796	≥ 10.0	≥ 876	≥ 11	382-406	48-51	60 ℃
N52	1430-1480	14.3-14.8	≥ 796	≥ 10.0	≥ 876	≥ 11	398-422	50-53	60 ℃
30M	1080-1130	10.8-11.3	≥ 796	≥ 10.0	≥ 1114	≥ 14	223-247	28-31	100 ℃
33M	1130-1170	11.3-11.7	≥ 836	≥ 10.5	≥ 1114	≥ 14	247-263	31-33	100 ℃
35M	1170-1220	11.7-12.2	≥ 868	≥ 10.9	≥ 1114	≥ 14	263-287	33-36	100 ℃
38M	1220-1250	12.2-12.5	≥ 899	≥ 11.3	≥ 1114	≥ 14	287-310	36-39	100 ℃
40M	1250-1280	12.5-12.8	≥ 923	≥ 11.6	≥ 1114	≥ 14	302-326	38-41	100 ℃
42M	1280-1320	12.8-13.2	≥ 955	≥ 12.0	≥ 1114	≥ 14	318-342	40-43	100 ℃
45M	1320-1380	13.2-13.8	≥ 995	≥ 12.5	≥ 1114	≥ 14	342-366	43-46	100 ℃
48M	1360-1430	13.6-14.3	≥ 1027	≥ 12.9	≥ 1114	≥ 14	366-390	46-49	100 ℃
50M	1400-1450	14.0-14.5	≥ 1033	≥ 13.0	≥ 1114	≥ 14	382-406	48-51	100 ℃
30H	1080-1130	10.8-11.3	≥ 796	≥ 10.0	≥ 1353	≥ 17	223-247	28-31	120 ℃
33H	1130-1170	11.3-11.7	≥ 836	≥ 10.5	≥ 1353	≥ 17	247-271	31-34	120 ℃
35H	1170-1220	11.7-12.2	≥ 868	≥ 10.9	≥ 1353	≥ 17	263-287	33-36	120 ℃
38H	1220-1250	12.2-12.5	≥ 899	≥ 11.3	≥ 1353	≥ 17	287-310	36-39	120 ℃
40H	1250-1280	12.5-12.8	≥ 923	≥ 11.6	≥ 1353	≥ 17	302-326	38-41	120 ℃
42H	1280-1320	12.8-13.2	≥ 955	≥ 12.0	≥ 1353	≥ 17	318-342	40-43	120 ℃
45H	1300-1360	13-13.6	≥ 963	≥ 12.1	≥ 1353	≥ 17	326-358	43-46	120 ℃
48H	1370-1430	13.7-14.3	≥ 995	≥ 12.5	≥ 1353	≥ 17	366-390	46-49	120 ℃
30SH	1080-1130	10.8-11.3	≥ 804	≥ 10.1	≥ 1592	≥ 20	223-247	28-31	150 ℃
33SH	1130-1170	11.3-11.7	≥ 844	≥ 10.6	≥ 1592	≥ 20	247-271	31-34	150 ℃
35SH	1170-1220	11.7-12.2	≥ 876	≥ 11.0	≥ 1592	≥ 20	263-287	33-36	150 ℃
38SH	1220-1250	12.2-12.5	≥ 907	≥ 11.4	≥ 1592	≥ 20	287-310	36-39	150 ℃
40SH	1240-1280	12.5-12.8	≥ 939	≥ 11.8	≥ 1592	≥ 20	302-326	38-41	150 ℃
42SH	1280-1320	12.8-13.2	≥ 987	≥ 12.4	≥ 1592	≥ 20	318-342	40-43	150 ℃
45SH	1320-1380	13.2-13.8	≥ 1003	≥ 12.6	≥ 1592	≥ 20	342-366	43-46	150 ℃
28UH	1020-1080	10.2-10.8	≥ 764	≥ 9.6	≥ 1990	≥ 25	207-231	26-29	180 ℃
30UH	1080-1130	10.8-11.3	≥ 812	≥ 10.2	≥ 1990	≥ 25	223-247	28-31	180 ℃
33UH	1130-1170	11.3-11.7	≥ 852	≥ 10.7	≥ 1990	≥ 25	247-271	31-34	180 ℃
35UH	1180-1220	11.8-12.2	≥ 860	≥ 10.8	≥ 1990	≥ 25	263-287	33-36	180 ℃
38UH	1220-1250	12.2-12.5	≥ 876	≥ 11.0	≥ 1990	≥ 25	287-310	36-39	180 ℃
40UH	1240-1280	12.5-12.8	≥ 899	≥ 11.3	≥ 1990	≥ 25	302-326	38-41	180 ℃
28EH	1040-1090	10.4-10.9	≥ 780	≥ 9.8	≥ 2388	≥ 30	207-231	26-29	200 ℃
30EH	1080-1130	10.8-11.3	≥ 812	≥ 10.2	≥ 2388	≥ 30	223-247	28-31	200 ℃
33EH	1130-1170	11.3-11.7	≥ 836	≥ 10.5	≥ 2388	≥ 30	247-271	31-34	200 ℃
35EH	1170-1220	11.7-12.2	≥ 876	≥ 11.0	≥ 2388	≥ 30	263-287	33-36	200 ℃
38EH	1220-1250	12.2-12.5	≥ 899	≥ 11.3	≥ 2388	≥ 30	287-310	36-39	200 ℃
28AH	1040-1090	10.4-10.9	≥ 787	≥ 9.9	≥ 2624	≥ 33	207-231	26-29	230 ℃
30AH	1080-1130	10.8-11.3	≥ 819	≥ 10.3	≥ 2624	≥ 33	223-247	28-31	230 ℃
33AH	1130-1170	11.3-11.7	≥ 843	≥ 10.6	≥ 2624	≥ 33	247-271	31-34	230 ℃