NingBo BeiLun Meank Magnetics Co.,Ltd.
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Technique Support

1. Magnetization Orientation Of Permanent Magnets



Magnetization Orientation Of Permanent Magnets


2. Surface Treatment Of Neodymium Magnet And The Features


Surface

Coating

Thickness (Microns)

Color

Resistance

Passivation


1

Silver Grey

Temporary Protection

Nickel

Ni+Ni

10-20

Bright Silver

Excellent Against Humidity


Ni+Cu+Ni




Zinc

Zn

8-20

Bright Blue

Good Against Salt Spray


C-Zn


Shinny Color

Excellent Against Salt Spray

Tin

Ni+Cu+Sn

15-20

Silver

Superior Against Humidity

Silver

Ni+Cu+Ag

10-20

Silver

Superior Against Humidity

Gold

Ni+Cu+Au

10-20

Gold

Superior Against Humidity

Copper

Ni+Cu

10-20

Gold

Temporary Protection

Epoxy

Epoxy

15-25

Black,Red,Grey

Excellent Against Humidity&Salt Spray


Ni+Cu+Epoxy





Zn+Epoxy




Parylene

Parylene

5-20

Grey

Excellent Against Humidity,Salt Spray,Superior Against Solvents,Gases, Fungi and Bacteria,FDA Approved

Chemical

Ni

10-20

Silver Grey

Excellent Against Humidity


3. Physical Properties Of Sintered Neodymium Magnet


Parameter

International Unit

Standard Data

Curie Temperature(Tc)

310-380

Maximum Operating Temperature(Tw)

80-230

Hardness

Hv

620

Electrical Resistivity (ᵨ)

Ω.cm

1.8x10⁻⁴  ~2.0x10⁻⁴

Density(D)

g/m³

7.45~-7.65

Recoil Permeability(µ rec)


1.05

Magnetization Field Strength(Hs)

kA/m

≧2400


kOe

≧30

Bending Strength

Mpa

295-345

Temp. Coefficient of Br

%℃

-0.11~-0.12

Temp.Coefficient of Hcj

%℃

-0.5~-0.7


4. Expressions Of Common Shaped Magnets


Expressions Of Common Shaped Magnets

Aug 13
2026
Aug 13
2026
Neodymium bar magnets are compact rectangular permanent magnets known for delivering exceptionally strong magnetic force relative to their size. Manufactured from neodymium, iron, and boron (NdFeB), t...
Neodymium Bar Magnets: High-Strength Magnetic Solutions for Industrial and OEM Applications
Aug 13
2026
Aug 13
2026
Magnets used outdoors or around water face challenges that standard bare magnets are not designed to handle. Moisture, rain, salt spray, impact, vibration, and repeated contact with painted or finishe...
Rubber Coated Waterproof Magnets: A Durable Magnetic Solution for Outdoor and Wet Environments