What demagnetize key cards?

The Enemy of Key Cards: Magnetic Fields and Demagnetization

Key cards, those convenient little plastic rectangles that grant access to our homes, offices, and even hotel rooms, rely on magnetic strips to function. But these strips are surprisingly vulnerable to a silent threat: magnetic fields.

While it might seem surprising, everyday objects can emit magnetic fields strong enough to disrupt the delicate magnetic patterns on a key card, rendering it useless. So what are the culprits?

1. The Suspects:

• Credit Cards and Cell Phones: While not as powerful as dedicated magnets, the magnetic fields generated by these devices can still affect key cards, especially if kept in close proximity for extended periods.
• Security Scanners: These devices, commonly found at airports or retail stores, are designed to detect magnetic fields and can inadvertently demagnetize key cards.
• Magnetic Closures: Bags, wallets, and even some clothing use magnetic closures for convenience. These magnets, although weak, can still disrupt the magnetic information on a key card over time.
• MRI Machines: The powerful magnetic fields used in Magnetic Resonance Imaging (MRI) machines can easily demagnetize key cards. If you’re undergoing an MRI, it’s best to leave your key card at home.
• Clothing Tags: Some clothing tags utilize magnetic strips for security purposes, and these can demagnetize key cards if kept in close contact.

2. Prevention is Key:

• Keep Distance: Avoid storing key cards near strong magnetic sources like cell phones, credit cards, or security scanners.
• Proper Storage: Use a dedicated key card holder or wallet that doesn’t contain magnets.
• Protect from Direct Contact: Avoid keeping key cards in pockets with strong magnetic closures, especially when carrying them in backpacks or purses.

3. When Disaster Strikes:

If your key card is demagnetized, don’t despair! Most key cards can be re-magnetized by a locksmith or security professional. However, some cards, especially older ones, may be permanently damaged.

4. Moving Forward:

While magnetic fields can be troublesome, they are a fact of modern life. By understanding the potential threats and taking simple precautions, you can ensure your key cards continue to serve their purpose, granting access to your world.