Sintered large neodymium speaker magnet

Specifications Sintered large neodymium speaker magnet

1) high quality NdFeb materials

2) customized size & accurate tolerance

Sintered large neodymium speaker  magnet   Specification: Moto:Excellent quality,lowest price,best service,quickest leading time. Material:NdFeB (Neodymium Iron Roron) Grade: N33, N35, N38, N40, N42, N48, N50, N52 (M, H, SH, EH, UH,AH). Shape:Disc,Round,Ring,Block etc. Tolerance in size:+/-0.1mm(some +/-0.5mm available). Coating:Ni,Black Ni,Zn,Ni-Cu-Ni,Epoxy,Parylene etc. Application:Motors,Generators,NdFeB pot magnet,Speakers,Magnetic Chuck,Earphones and other musical instruments etc.  Detailed specification:

Description	Magnet
Material:	Neodymium magnet

Woking Temperature	Grade	Max.Operating Temperature
	N35-N52	80°c
	33M-48M	100°c
	33H-48H	120°c
	30SH-45SH	150°c
	30UH-40UH	180°c
	28EH-38EH	200°c
	28AH-35AH	220°c

Properties of Selected Magnetics Materials
This chart presents some of the magnetic properties of a subset of magnetic materials:

	Maxium Energy Product Bhmax(MGOe)	Residual FluxDensity Br(G)	Coercive Force Hc(Koe)	Working Temperature  °c
Ceramic 5	3.4	3950	2400	400
Sintered Alnico5	3.9	10900	620	540
Cast Alnico 8	5.3	8200	1650	540
Samarium Cobalt 20(1.5)	20	9000	8000	260
Samarium Cobalt 28 (2,17)	28	10500	9500	350
Neodymium N45	45	13500	10800	80
Neodymium 33UH	33	11500	10700	180

    Warnings: Neodymium magnets attract each other with almost twice the force that they use to attract steel objects.They also attract each other through very large distances, even small magnets will attract each other through the thickness of your finger!    About NdFeB magnet:   Neodymium iron boron ( NdFeB) is a type of rare earth magnetic material. 
NdFeB is the most advanced commercialized permanent magnet material available today. This material has similar properties as the samarium cobalt except that it is more easily oxidized and generally doesn't have the same temperature resistance.
However, NdFeB magnets have the highest energy products approaching 52MGOe and are mechanically stronger than samarium cobalt magents. NdFeB material is more costly by weight than ceramic or alnico but produces the highest amount of flux per unit of volume or mass amking it very economical for many applicantions. Their high energy products lend themselves to comnpact designs that result in innovative applications and lower manufacturing costs.
Unprotected NdFeB magnets are subject to corronsion. Surface treatments has ben developed that allow them to be used in most applications. These treatments include copper, silver,, gold, nickel, zinc and tin plating and epoxy resin coating.
Beneficial characteristics of NdFeB magnets include their very high energy product, very high coercive force, and moderate temperature stability. Drawbacks include lower mechanical strength, and low corrosion resistance when not properly coated or plated. Magnetic Grades and Temperature:   The Grade of a magent directly refers to the Maximum Energy Product of the material that composes the magnet. It in no way refers to the physical properties of the magnet. Grade is generally used to describe how "strong" a permanent magnet material is. The energy products is specified in the unites Gauss Oersted. One MGOe is 1,000,000 Gauss Obersted. A grade forty (N40) would have a Maximum Energy Product of 40 MGOe.The higher the grade the "stronger" the magnet.  Magnetic materials have a wide range of working temperatures. The following chart the various materials and their maximum working temperature. NdFeB material
comes in many different heat tolerances but as the heat tolerance increases the maximum available fulx density decreases:       CONTACT US: Please do no hesitate to contact with us if you have any questions or requests on magnet.
You can inquiry either by email/fax or instant message
We are pleased to offer your service and respond within 12 hours Sales department:  Ms.Alice Skype:uskymag05 Tel:+86 574 88229326
Relevant  Shipping Advantage:
1) Appointed forwarder is welcome
2) We can ship by express, air & sea
3)  We have big discount on our won forwarder, and mainly world-wide express such as : DHL, UPS, Fedex