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NdFeB magnet is mainly made from neodymium, iron and boron. With excellent magnetic property、abundant raw material and reasonable prices, NdFeB Magnet is used as an ideal magnet in mini-motor, magnetic resonance imaging, sound device, magnetic suspension system, magnetic transmission machine and iatrical apparatus and etc. For NdFeB, if left it exposed, the iron in the magnet will rust. To protect the magnet from corrosion, it is usually preferable for the magnet to be coated. There are a variety of options for coatings, but nickel is the most common and usually preferred. Some other options for coating are zinc and epoxy.

NdFeB Magnet Magnetic Properties

Grade	Remanence		Coercivity	Intrinsic Coercivity		Max. Energy Products		Working Temp. °C
	Br(T)		H cb	H cj		(BH) max (kJ/m3)
	Max	Min	KA/m	KOe	KA/m	Max	min
N35	1.25	1.18	≧ 860	≧12	≧960	295	263	≦ 80
N38	1.30	1.23	≧ 860	≧12	≧960	320	287	≦ 80
N40	1.32	1.27	≧ 876	≧12	≧960	335	302	≦ 80
N42	1.35	1.30	≧ 876	≧12	≧960	350	318	≦ 80
N45	1.38	1.33	≧ 756	≧12	≧960	366	335	≦ 80
N33M	1.22	1.14	≧ 851	≧14	≧1100	279	247	≦ 100
N35M	1.25	1.18	≧ 860	≧14	≧1100	295	263	≦ 100
N38M	1.30	1.23	≧ 876	≧14	≧1100	320	287	≦ 100
N40M	1.32	1.27	≧ 910	≧14	≧1100	335	302	≦ 100
N30H	1.17	1.08	≧ 812	≧17	≧1350	255	223	≦ 120
N33H	1.22	1.14	≧ 844	≧17	≧1350	279	247	≦ 120
N35H	1.25	1.18	≧ 876	≧17	≧1350	295	263	≦ 120
N38H	1.30	1.23	≧ 890	≧17	≧1350	318	287	≦ 120
N40H	1.32	1.27	≧ 939	≧17	≧1353	335	302	≦ 120
N30SH	1.17	1.08	≧ 796	≧20	≧1600	255	223	≦ 150
N33SH	1.22	1.14	≧ 836	≧20	≧1600	279	247	≦ 150
N35SH	1.25	1.18	≧ 876	≧20	≧1600	295	263	≦ 150
N28UH	1.13	1.05	≧ 756	≧25	≧2000	239	207	≦ 180
N30UH	1.17	1.08	≧ 756	≧25	≧2000	255	223	≦ 180
N33UH	1.22	1.14	≧ 756	≧25	≧2000	279	247	≦ 180

Note：
1.The above data are given at temperature 23°C +/-3°C .
2.Max working temperature is changeable due to the length-diameter ratio and environmental facts.
3.According to P.R China standard GB/T 13560-2000

NdFeB Magnet Magnetic Properties

Grade	Remanence		Coercivity	Intrinsic Coercivity		Max. Energy Products		Working Temp. °C
	Br(T)		H cb	H cj		kJ/m3
	Max	Min	KA/m	KOe	KA/m	Max	min
N48	1.42	1.38	≧ 11.5	≧12	≧800	398	366	≦ 80
N42M	1.35	1.30	≧ 12.0	≧14	≧1100	350	318	≦ 100
N45M	1.38	1.33	≧ 12.2	≧14	≧1100	366	334	≦ 100
N48M	1.42	1.38	≧ 12.8	≧14	≧1100	398	366	≦ 100
N42H	1.35	1.30	≧ 12.0	≧17	≧1350	350	318	≦ 120
N45H	1.38	1.33	≧ 12.2	≧17	≧1350	366	334	≦ 120
N48H	1.42	1.38	≧ 12.8	≧17	≧1350	398	366	≦ 120
N38SH	1.30	1.23	≧ 11.6	≧20	≧1600	318	287	≦ 150
N40SH	1.32	1.27	≧ 11.8	≧20	≧1600	335	302	≦ 150
N42SH	1.35	1.30	≧ 12.0	≧20	≧1600	350	318	≦ 150
N35UH	1.25	1.18	≧ 11.0	≧25	≧2000	295	263	≦ 180
N28EH	1.13	1.05	≧ 9.8	≧30	≧2400	239	207	≦ 200
N30EH	1.17	1.08	≧ 10.1	≧30	≧2400	255	223	≦ 200
N33EH	1.22	1.14	≧ 10.2	≧30	≧2400	279	247	≦ 200

Note:
• The above data are given at temperature 23 °C +/ -3 °C .
• Max working temperature is changeable due to the length-diameter ratio and environmental facts.
• According to P.R China standard GB/T 13560-2000

NdFebB Physical Properites:
Temp.Coeff.Of Br: -0.11%/°C
Density: 7.4g/cm3
Vickers Hardness: 600Hv
Tensile Strength: 8.0kg/mm2
Specific Heat: 0.12k Cak(kg°C)
Young's Modulus: 1.6x1011N/m2
Poisson's Ratio: 0.24
Curie Temperature: 310-340°C
Electrical Resistivity: 144Ω.cm
Flexural Strength: 25kg/mm2
Coeff.of Thermal Expansion: 4x10-6/°C
Thermal conductivity: 7.7cal/m.h.°C
Rigidity: 0.64N/m2
Compressibility: 9.8x10-12m2/N
Temp.Coeff.Of iHc: -0.60%/°C