Polymer-bonded magnets · Drawing review
Review the powder, binder and pole pattern together
Bonded magnets combine magnetic powder with a polymer binder. For a custom part, Magnetstek reviews the forming method, finished geometry, magnetic output and operating conditions before confirming the proposed specification and quotation.
Send a drawing and describe the useful field or torque in the assembly. Material availability, tooling, quantity, price and lead time are confirmed for the individual request.
For a ring, specify the bore, outside diameter, height and pole faces. For a block, disc or shaped part, identify the surfaces that locate it and the gap where magnetic output is needed.
Process selection
A bonded magnet is a composite. Its behavior depends on the magnetic powder, binder and forming process as well as the finished geometry.
In compression bonding, a powder-and-binder compound is compacted in a die and the binder is cured. Review the geometry and magnetic requirements before selecting the compound.
Rings and other die-formed parts need a review of wall thickness, height, edge details and tooling. Requested dimensions and tolerances remain subject to confirmation.
Discuss a compression-bonded part →Injection molding forms a magnetic compound in a mold. The powder and polymer combination affects magnetic and physical properties.
Discuss any inserts, locating features, molding direction and assembly interfaces. Confirm the proposed material and process for the complete drawing.
Review injection-molded magnet requirements →What to specify
Include the drawing revision, tolerances, critical fits, bore, wall thickness and mating parts. Mark dimensions that can be discussed.
Give the requested powder, binder or grade if known. If these are open, describe the performance and environment so options can be reviewed.
Specify pole count, pole faces, orientation and reference features. A ring shape alone does not establish a radial or diametric pattern.
Define the field, flux or torque target, measurement location, working gap, fixture and allowed range.
State temperature, cycling, humidity, chemicals, assembly loads and any coating, adhesive or housing requirements.
Provide sample and production quantities, tooling constraints and required documentation. Confirm commercial terms in the quote.
Geometry concepts
These AI-generated illustrations show ring and shaped-part concepts. They do not establish dimensions, grade, pole count, inventory or inspection results. Send your drawing to review the actual specification.
Technical reference
These topics collect the useful design questions from the previous page. Numerical grade limits need the proposed material’s documentation rather than an unverified general table.
Magnetic particles are held in a binder matrix and formed into a part. Bonded NdFeB refers to the magnetic powder family; it does not identify one universal polymer, process or finished-part specification.
Polymer bonding is different from gluing an already formed magnet to a component. If the inquiry concerns an adhesive joint, identify both substrates, surface condition, loads and environment.
Bonded compounds may use NdFeB, ferrite or SmCo powder. The compound’s magnetic and physical properties depend on both constituents and their proportions. A binder choice also needs a review of temperature, moisture, chemicals and assembly requirements.
Use the proposed compound’s datasheet for numerical limits. Do not transfer the performance of a sintered magnet or a powder alone to the finished bonded composite.
Isotropic and anisotropic materials have different orientation requirements. Confirm the proposed material and how its orientation relates to the magnetization pattern and forming process.
State whether a grade is mandatory or whether alternatives can be reviewed. A family label alone does not determine the possible pole arrangement.
Mark the pole count, active inner or outer surface, pole sequence, angular reference and any relationship to a key or locating feature. Include the sensor position or working gap where relevant.
Specify how pole polarity, field amplitude and any waveform requirement will be checked. Confirm the magnetization fixture and the acceptance method for the proposed dimensions.
Magnetization direction reference →Temperature suitability depends on the magnetic material, binder and assembly conditions. Review continuous operation, peaks and cycling with the proposed compound’s data.
Include opposing fields and the working point in the magnetic review. Also review changes in fit, environmental exposure and the other assembly materials. A generic maximum temperature is not a guaranteed finished-part limit.
Identify critical dimensions and define the conditions under which they are measured. Discuss shrinkage, conditioning and the intended operating environment with the proposed material and process.
Specify moisture, chemical contact, handling wear and any protective finish or housing. A polymer binder does not establish waterproofing or universal corrosion resistance.
Compare the complete part in its magnetic circuit: required output, available space, pole pattern, geometry, temperature, assembly steps and quantity. Neither route is automatically the best choice for every design.
A sintered material’s published magnetic values cannot be used as a bonded-part specification. Review the proposed grade and compound separately, then agree the finished-part acceptance test.
Review custom sintered NdFeB requirements →Agree the drawing revision, dimensional checks, pole pattern, surface condition and magnetic test arrangement. Identify the sample size and which records are needed for material properties and finished-part acceptance.
For a motor, sensor, medical device or other regulated or safety-critical assembly, provide the applicable system requirements. A generic application example does not establish device qualification.
First article inspection checklist →From drawing to quotation
Step 1
Describe the magnetic function, interfaces, working conditions and estimated quantity.
Step 2
Discuss powder, binder, forming method, geometry, pole pattern and any tooling needs.
Step 3
Confirm the drawing revision, checks, samples and records required for the part.
Step 4
Review available specifications, tooling terms, quantities, price and delivery before ordering.
Existing video reference
The existing Magnetstek magnetization equipment video is retained as process context. Its contents do not replace the drawing, material datasheet or inspection requirements agreed for your part.
Documents & related options
List any required compound datasheet, temperature-dependent magnetic curves, environmental test or inspection record in the inquiry. Confirm which records apply to the proposed material and can be supplied with the order.
Prepare the geometry, magnetic function and acceptance conditions.
RFQ guide →Review molded geometry, inserts and material requirements.
Molded magnets →Define the mating parts, retention and required output.
Assembly requirements →Compare a different material against the same design requirements.
Custom NdFeB →Technical context: Arnold’s permanent magnet material and binder/process reference, Arnold’s injection-molded material explanation and Magnequench’s bonded powder explanation. These explain material and process principles; their product specifications and capabilities are not Magnetstek supply claims.