The reason NFC tags does not work on metal is that the metal surface behind the tag acts as a ground and reduces the performance of the tag's antenna, effectively stopping it creating the current needed to power the chip. 

In reality, you can often get the tags to work with just a small gap (0.5-1cm) and we know of many clients who just use thick foam type sticker to create a gap .However, to do the job properly, you should use on-metal tag which have a ferrite foil barrier between the tag and the adhesive layer.

 

How the difference between normal nfc sticker and anti-metal nfc sticker 

Because NFC tags or sticker work by electromagnetic induction, metal can easily interfere with their operation, NFC Tags can never work behind metal and if placed directly onto metal, then you need to use special anti-metal tags or ferrite tag for application.

 

 

1: Chip Type: NXP Ultralight,  NXP Ultralight C,  NXP Ntag 213 , Topaz 512

2: Memory:   512 bits, 192 bytes, 168 bytes, 512 bytes 

3: Technology: NFC Type 2 and ISO 14443A protocol

4: Frequency:  13.56mhz 

5: R/W:  the writing endurance will 100000 times

6: Date Transmission: 106 k bit/s 

 

Feature

 Surface: PVC, Paper or PET material

 Backside: adhesive or requested 3M adhesive

 Middle: anti-metal layer or ferrite material 
 Size: 25mm Dia, 35*35mm, 43*26mm, 50*50mm, 86*54mm, or as request
 Thickness: 0.55~0.8 mm
 Store temperature: -25 ℃ ~50 ℃
 Working temperature: -40 ℃~ 65 ℃

Can work on metal or battery environment 

 

Application 

For use in NFC forum tag. smart-poster

connection handover /one-touch set-up

smart nfc enable mobile phone, e-wallet, e-ticket, etc.