When do you use a rubber protective cap with a magnet?
A self-adhesive rubber protective disc is placed between a magnet and a surface. The disc protects delicate surfaces from scratches and increases the grip of pot magnets on smooth materials such as glass, paint, and plastic. Below, you can read when this is useful, how to choose the right size, and what to look out for.
What do you use a protective disc for?
- Preventing scratches: A metal magnet can scratch a smooth or painted surface. The rubber disc sits between them.
- More grip: On smooth materials like glass, paint, and plastic, a magnet slides away more easily. Rubber provides more grip.
Which size should you choose?
You should choose a disc with approximately the same diameter as your magnet. Our discs are available in Ø20, Ø25, Ø30, Ø40, and Ø50 mm. They are made of rubber, are self-adhesive, and resistant up to 80 °C. Check beforehand if the disc fits your magnet.
| Disc diameter | Fits magnets of approximately |
|---|---|
| Ø20 mm | Ø20 mm |
| Ø25 mm | Ø25 mm |
| Ø30 mm | Ø30 mm |
| Ø40 mm | Ø40 mm |
| Ø50 mm | Ø50 mm |
Looking for the right magnet? View our guides on disc magnets, ring magnets, and pot magnets.
Pay attention to the holding power
An extra layer between the magnet and the surface increases the distance between the two. This can limit the holding power. Therefore, always test if the combination is strong enough for your application. Also, read how the holding power of a magnet is determined.
Protective disc or rubber-coated magnet?
If the magnet already has a rubber coating, a separate disc is usually not necessary. You can read about the differences between NiCuNi, epoxy, plastic, and rubber in our guide which coating or finish should you choose?
Frequently asked questions
Is the disc self-adhesive?
Yes, the rubber protective discs are self-adhesive.
What temperature is the disc resistant to?
Up to 80 °C.
Which sizes are available?
Ø20, Ø25, Ø30, Ø40, and Ø50 mm. View all self-adhesive rubber protective discs.
Are you unsure which disc fits your magnet? Ask the Magnet Specialist via our magnet advisor or via contact.
