Magnetic gaskets and closures
Profile section, flexibility, closure force and temperature.
Flexible Magnets — Bendable, Cuttable, Cost-Efficient
Rubber-bonded ferrite magnets combine moderate magnetic properties with the flexibility of polymer. Cut with scissors, punch with dies, and laminate with adhesives or vinyl — the most versatile magnet format.
For Procurement
MOQ, lead time, packaging and commercial terms — go straight to a quotation.
Request a Quote →For Engineering
Grades, drawings, process data and design support for your DFM review.
Grade Datasheets & Technical Data →For Quality / SQE
Certificates, inspection planning, traceability and PPAP / FAI support per project.
Certificates & Documentation →Magnetic Performance at a Glance
Product Range
Flexible Magnets — Product Gallery
Representative product forms for reference. Final geometry, material and finish are agreed for each project.
Why Flexible Magnets?
When your application needs a magnet that conforms to a surface, cuts to shape on-site, or costs almost nothing per unit area.
- ✓Truly flexible — bends to radii down to 10mm without cracking — conforms to curved and uneven surfaces
- ✓Easy to process — cut with scissors, die-cut, slit, punched, or laminated — no special tools required
- ✓Low cost — isotropic sheet is the cheapest magnet product by area
- ✓Available with adhesive — pressure-sensitive acrylic adhesive on one face, with release liner
Applications
| Application | Typical Spec | Why This Material |
|---|---|---|
| Signage & Displays | Isotropic 0.5–0.85mm sheet | Printable, cuttable, replaceable — the standard for point-of-purchase |
| Door Gaskets & Seals | Extruded profile with PP insert | Refrigerator and shower door sealing with reliable closure |
| Reed Switch / Sensor Targets | Anisotropic 1.0–1.5mm | Magnetize into multi-pole patterns for proximity sensing |
| Toys & Educational | Isotropic sheet | Safe, inexpensive, colorful printable surface |
| Motors | Anisotropic rolled ring | Small BLDC motors using rolled flexible magnet rings |
Flexible Magnet Types
Flexible rubber magnet datasheet available for download.
| Type | Energy Product | Br (mT) | Thickness | Magnetization | Best For |
|---|---|---|---|---|---|
| Isotropic Sheet | 0.5–0.8 MGOe | 100–160 | 0.3–3.0 mm | Multi-pole on one face | Signage, general |
| Anisotropic Sheet | 1.2–1.7 MGOe | 200–240 | 0.5–2.0 mm | Through-thickness | Sensors, motors |
| Extruded Profile | 0.5–1.5 MGOe | 100–220 | Custom profile | Multi-pole or axial | Gaskets, seals |
| Magnetic Strip | 0.6–1.0 MGOe | 120–180 | 2–10 mm wide | One face | Labels, retail |
Isotropic vs Anisotropic Flexible
The magnetic orientation of the ferrite powder determines strength and cost:
- ✓Isotropic — random powder orientation — lower energy product but can be multi-pole magnetized and costs less; the standard for signage
- ✓Anisotropic — powder aligned during calendering — 2× stronger, must be magnetized through thickness; used in sensors and motors
- ✓Multi-pole patterns — 3, 5, 7 poles per inch standard for isotropic — strong holding force at short air gaps
Processing & Finishing
Flexible magnets ship in formats ready for your production line:
- ✓Standard formats — sheets 620×1000mm or rolls 10–60m × 100–620mm wide
- ✓Laminations — white or colored PVC, adhesive (acrylic PSA), or plain ferrite face
- ✓Die-cutting — we die-cut to your shape in volume, or supply sheet for your own cutting
- ✓Temperature limit — the polymer binder (not the ferrite) limits operation to 80–100°C — beyond that, use rigid ferrite
Complete Technical Data
Full reference tables for Flexible (Rubber-Bonded) Magnets — migrated from our production specification library. Click any row's PDF to download the grade datasheet.
Data table 1
| Flexible Magnet Product Forms & Dimensions | |||||
|---|---|---|---|---|---|
| Product Form | Magnetic Grade | Printable / Top Surface | Total Thickness | Max Width | Typical Roll Length |
| Magnetic Sheet (Plain) | Isotropic / Semi / Anisotropic | UV coating; ready for lamination | 0.2 – 10 mm | 1,524 mm (60") | 15 / 20 / 30 m |
| Print-Mag Laminate | Isotropic / Semi / Anisotropic | White/colored PVC, PET, PP, paper, photo paper | 0.3 – 2.0 mm | 1,524 mm (60") | 15 / 20 / 30 m |
| Inkjet Media | Standard or high-performance | PVC waterproof matte / glossy | 0.35 – 1.0 mm | 600 mm – 1.52 m | Rolls |
| Car Magnet | High-performance | Printed PVC or PET + PP backing film | 0.35 – 1.0 mm | 1,000 mm | Sheets / rolls |
| Press-Printed Sheet | Standard or high-performance | High-quality synthetic paper | 0.25 – 0.5 mm | Sheets | Sheets / rolls |
| Desktop / Craft Sheet | Isotropic | Plain, printable, or adhesive | 0.4 – 1.0 mm | A4 / Letter / custom | Pads / sheets |
| All dimensions are representative. Custom widths, slit rolls, die-cut shapes, and adhesive lamination are available on request. Contact a Ningbo Empire representative to match the right grade and thickness to your converting process. | |||||
Data table 2
| Typical Magnetic Properties of Flexible Ferrite Sheet | |||||
|---|---|---|---|---|---|
| Grade Type | Br kG / mT | Hc kOe / kA/m | Hci kOe / kA/m | (BH)max MGOe / kJ/m³ | Max Operating Temp. |
| Isotropic | 1.4 – 1.7 (140 – 170) | 1.0 – 1.3 (80 – 104) | 1.3 – 1.7 (104 – 136) | 0.5 – 0.8 (4.0 – 6.4) | 80 – 100 °C |
| Semi-Anisotropic | 1.8 – 2.1 (180 – 210) | 1.4 – 1.7 (112 – 136) | 1.8 – 2.2 (144 – 176) | 0.8 – 1.1 (6.4 – 8.8) | 80 – 100 °C |
| Anisotropic | 2.2 – 2.5 (220 – 250) | 1.8 – 2.2 (144 – 176) | 2.4 – 3.0 (192 – 240) | 1.1 – 1.4 (8.8 – 11.2) | 100 – 120 °C |
| Values are typical ranges for bonded ferrite-rubber calendered sheet. Actual values depend on ferrite loading, binder system, calendering direction, and magnetization pattern. Samples should be tested before final specification. | |||||
Application Engineering
Where flexible magnets Fit
Typical component uses and the requirements to discuss before quotation. Suitability depends on your design and validation criteria.
Warehouse labels and identification
Holding force, print or adhesive compatibility and surface condition.
Compact motors and encoders
Pole pitch, magnetic orientation and speed-dependent sensing requirements.
Removable displays and signage
Sheet thickness, printable finish and holding force on the intended surface.
Frequently Asked Questions
How strong are flexible magnets?
Isotropic flexible sheet has about 10% of ferrite's energy product and 1% of NdFeB's. For holding force: a 0.75mm isotropic multi-pole sheet holds roughly 20–40 g/cm² against steel. It's strong enough for signage and light holding, but not for structural or mechanical applications.
Can flexible magnets be printed on?
Yes — laminate white PVC or printable vinyl on the magnet face, then print with UV, screen, or digital methods. We supply laminated sheet in white matte or gloss finishes ready for printing.
What adhesive backing do you offer?
Standard acrylic pressure-sensitive adhesive (3M-type equivalent) with release liner. For high-temp (up to 80°C continuous), we offer a high-tack acrylic variant. We can also laminate double-sided adhesive foam for mounting to uneven surfaces.
Can flexible magnets work at high temperature?
The limiting factor is the polymer binder. Standard PVC binder handles 80°C continuous, 100°C intermittent. For higher temperatures, use rigid ferrite magnets which handle 250°C.
Formats & Conversion
Bonded ferrite in polymer matrix — supplied in the format your production line needs:
- ✓Sheet — 0.3–3 mm thick, up to 620 mm wide, rolls or sheets
- ✓Strip & extruded profiles — fridge-door style extrusions, custom sections
- ✓Die-cut parts — kiss-cut on roll or sheet for automated assembly
- ✓Laminated — PVC / adhesive / steel backing on request
- ✓Printed — litho or screen printing for promotional and labeling use
Dimensional Tolerances
Flexible magnet tolerances depend on the conversion process:
| Process | Typical Tolerance | Notes |
|---|---|---|
| Die-cut | ±0.3 mm | Most economical for shapes |
| Profile / laser cut | ±0.1 mm | Tighter shapes on request |
| Thickness | ±0.05 mm | Calendered sheet |
| Extruded profile | ±0.2 mm | Cross-section dependent |
Test & Quality Documentation
What ships with your parts — scoped per project during quotation.
Magnetic Properties
Certificate of Analysis with measured Br / Hcb / Hcj / (BH)max against the specified grade of your flexible magnet parts, from our demagnetization-curve test equipment.
Dimensional Inspection
Dimensional reports by gauge or CMM as agreed in the inspection plan; critical dimensions identified together during DFM review.
Compliance & Project Docs
RoHS / REACH declarations on request, and FAI / PPAP documentation per project requirements.
Production & Supply Planning
Flexible Magnets: A Defined Route to Repeat Orders
Agree the process, acceptance criteria and shipment plan before production starts. The quotation identifies the producing site and the controls required for your part.
Confirm the manufacturing route
Review compound, sheet or profile forming, surface lamination, cutting and magnetization pattern.
Approve the inspection plan
Specify thickness, profile dimensions, pole pitch and holding force under the intended conditions.
Qualify before repeat supply
Define sample approval, drawing revision and lot identification. Agree how material, process or site changes will be reviewed before implementation.
Plan releases and delivery
Confirm order quantities, capacity allocation, packaging and shipping terms against your forecast. Delivery dates and any buffer-stock arrangement belong in the agreed supply plan.
Have a Drawing or Specification?
Send it to our team for engineering review and quotation — grade recommendation included.