NFC Anti-Metal Tags Explained: Materials, Chips and Applications

RFID Technologies
June 24, 2026

NFC tags are widely used for product identification, equipment management, digital product information, authentication and customer engagement. However, a standard NFC label usually performs poorly when it is attached directly to metal.

Metal changes the electromagnetic field around the tag antenna. This can detune the antenna, reduce energy transfer and, in some cases, make the tag completely unreadable. An NFC anti-metal tag solves this problem by adding a magnetic isolation layer between the antenna and the metal surface.

The finished tag may look like a normal PVC or PET NFC sticker, but its internal structure is different. Material selection, ferrite thickness, antenna design, adhesive and chip type all affect the final reading performance.

This guide explains:

How NFC anti-metal tags work
The typical structure of an on-metal NFC label
The differences between PVC and PET materials
When to choose NTAG215, NTAG216 or the NTAG 424 DNA chip
Common industrial and consumer applications
The specifications buyers should confirm before ordering

What Is an NFC Anti-Metal Tag?

An NFC anti-metal tag, also called an on-metal NFC tag, is an NFC transponder designed to operate when mounted on a metal or conductive surface.

Like a standard NFC tag, it normally contains:

An NFC chip
A loop antenna
A printable or protective surface material
An adhesive layer

The key difference is the addition of a ferrite or magnetic shielding layer behind the antenna.

This layer separates the NFC antenna from the metal substrate and redirects the magnetic field through the antenna. Without this barrier, the nearby metal can alter the antenna’s inductance and operating frequency, preventing reliable communication between the tag and an NFC-enabled smartphone or reader.

Most NFC anti-metal tags operate at 13.56 MHz. Depending on the selected chip, they may comply with NFC Forum Type 2 or Type 4 specifications and ISO/IEC 14443 Type A.

Why Standard NFC Tags Do Not Work Well on Metal

NFC communication relies on near-field magnetic coupling between the reader antenna and the tag antenna.

When a conventional NFC inlay is placed directly on metal, electrical currents are induced in the metal surface. These currents oppose the reader’s magnetic field and disrupt the antenna’s tuning.

The result may include:

Significantly reduced reading distance
Unstable smartphone detection
Different performance on different metal surfaces
Failed data reading or writing
Complete loss of NFC functionality

Adding a thicker adhesive or a normal plastic spacer may create a small physical gap, but it does not provide the same magnetic isolation as a properly selected ferrite layer.

For reliable production use, an NFC tag intended for metal should be designed and tuned as a complete on-metal construction.

The Typical Structure of an NFC Anti-Metal Tag

A flexible anti-metal NFC label usually contains several laminated layers.

1. Printable face material

The top layer provides the visible surface of the tag. It may be printed with:

A company logo
Product instructions
A QR code
A serial number
Asset information
Safety symbols
Branding graphics

PVC and PET are two common face materials.

2. Protective coating or overlaminate

A transparent coating or film may be added to improve resistance to:

Scratching
Moisture
Cleaning chemicals
UV exposure
Printed-image wear

The protection level depends on the exact film, coating, ink and lamination process.

3. NFC inlay

The inlay contains the NFC chip and antenna. The antenna is commonly produced from etched aluminum or copper.

The inlay dimensions and antenna geometry influence:

Reading performance
Final tag size
Compatibility with small metal objects
Sensitivity to mounting conditions
Smartphone user experience

4. Ferrite anti-metal layer

The ferrite layer is the functional component that allows the tag to operate on metal.

It acts as a magnetic barrier between the antenna and the conductive mounting surface. Ferrite thickness and magnetic properties must be matched to the antenna design.

A thinner ferrite layer can produce a lower-profile label, but it may provide less isolation. A thicker or higher-performance ferrite layer may improve performance but increase tag thickness and cost.

5. Pressure-sensitive adhesive

The adhesive fixes the tag to the metal surface.

Adhesive selection should consider:

Smooth or textured metal
Painted or powder-coated surfaces
Stainless steel or aluminum
Surface contamination
Oil and grease exposure
Indoor or outdoor use
Application temperature
Long-term operating temperature
Permanent or removable installation

A strong chip and antenna will not compensate for an adhesive that lifts from the equipment after several weeks.

6. Release liner

The release liner protects the adhesive before installation and is removed when the label is applied.

For automatic labeling, the liner, tag pitch and roll direction must also be compatible with the application equipment.

PVC NFC Anti-Metal Tags

PVC, or polyvinyl chloride, is commonly used as the visible surface or protective body of flexible NFC tags.

PVC anti-metal tags can be produced as:

Thin adhesive stickers
Printed round discs
Flexible labels
Laminated cards
Epoxy-covered tags
Custom-shaped promotional tags

Advantages of PVC Material

Flexibility

Flexible PVC can conform to mildly curved surfaces more easily than a rigid label construction.

This makes it suitable for:

Metal bottles
Cylindrical equipment
Appliances
Curved machine housings
Promotional products

The permitted bending radius still depends on the antenna and ferrite layer. Excessive bending can crack the antenna or change its tuning.

Good printability

PVC offers a smooth surface for logos, graphics, numbers and QR codes. It can support several printing and finishing processes depending on the tag construction.

Cost-effective customization

PVC is often selected for customized anti-metal tags that require a branded appearance without an industrial hard-tag enclosure.

Available in different finishes

Possible surface finishes include:

Glossy white
Matte white
Transparent
Colored PVC
Printed PVC
Epoxy-coated PVC

Limitations of PVC Anti-Metal Tags

PVC is not automatically suitable for every industrial environment.

The exact formulation can affect:

Temperature resistance
UV stability
Chemical resistance
Flexibility
Dimensional stability
Long-term outdoor durability

Plasticizers used in some flexible PVC formulations may also influence aging and adhesive interaction. Buyers should therefore evaluate the complete finished tag rather than approving the product based only on the word “PVC.”

Typical Applications for PVC Anti-Metal NFC Tags

PVC constructions are commonly used for:

Smart promotional products
Metal business cards and displays
Consumer electronics
Home appliances
Interactive metal signage
Digital menus mounted on metal
NFC social media tags
Smart product information
Indoor equipment identification
Branded customer-engagement tags

PVC is often appropriate when appearance, flexibility and economical custom printing are more important than extreme industrial durability.

PET NFC Anti-Metal Tags

PET stands for polyethylene terephthalate. In the label industry, PET is often referred to as polyester.

PET is widely used for durable identification labels because it can provide a thin, strong and dimensionally stable surface. Specific PET label constructions can also offer strong resistance to moisture, abrasion, weathering and chemicals.

Advantages of PET Material

Thin profile

PET film can provide a durable printed surface without making the finished tag unnecessarily thick.

The ferrite layer will still make an anti-metal tag thicker than a standard NFC label, but a PET face can help maintain a relatively low-profile construction.

Dimensional stability

PET generally retains its shape better than highly flexible vinyl materials. This can be useful when the tag must remain flat and properly aligned over time.

Resistance to tearing and abrasion

A suitable PET face or PET overlaminate can improve resistance to:

Edge damage
Scuffing
Surface wear
Handling
Cleaning
Printed-information loss

Moisture and chemical resistance

Industrial polyester label materials are available for environments involving water, humidity, cleaning agents and limited chemical contact.

However, chemical resistance should never be assumed from the material name alone. The ink, top coating, adhesive and ferrite layer must also survive the same environment.

Industrial appearance

White, silver and transparent PET materials are commonly used for:

Equipment labels
Electronics labels
Rating plates
Asset identification
Maintenance labels
Durable product markings

Limitations of PET Anti-Metal Tags

PET is generally less conformable than soft PVC. A PET label may not be the best choice for a very tight curve or irregular mounting surface.

It may also cost more than a basic PVC construction, particularly when combined with:

High-performance adhesive
Chemical-resistant printing
UV-resistant overlaminate
Thick ferrite
Serialized data
Security chips

Typical Applications for PET Anti-Metal NFC Tags

PET anti-metal tags are commonly suitable for:

IT asset tracking
Servers and network equipment
Industrial machinery
Electrical cabinets
Laboratory equipment
Metal tools
Maintenance records
Appliance identification
Automotive components
Reusable metal containers
Industrial product authentication

PET is usually the stronger choice when buyers need a thin, professional and durable label for equipment or product identification.

PVC vs PET for NFC Anti-Metal Tags

The material should be selected according to the mounting surface and operating environment rather than price alone.

Requirement	PVC	PET
Flexibility	Generally better	Moderate
Tight curved surfaces	Often more suitable	Requires testing
Dimensional stability	Moderate	Generally better
Thin industrial labels	Suitable	Often preferred
Abrasion resistance	Depends on coating	Typically strong with suitable construction
Moisture resistance	Available	Typically strong
Chemical resistance	Product-specific	Industrial-grade options widely available
Custom color printing	Good	Good
Promotional use	Common	Suitable
Industrial asset labels	Suitable for light-duty use	Often preferred
Outdoor use	Requires qualified construction	Requires qualified construction
Cost	Often lower	Often higher

This table represents common material tendencies, not guaranteed performance values. A finished NFC label is a multi-layer product, and the weakest layer may determine its service life.

Choosing the NFC Chip

The face material determines the physical characteristics of the tag. The chip determines memory, communication features and security capabilities.

PVC and PET anti-metal tags can be manufactured with different NFC chips. There is no rule that a particular chip must be paired with a particular face material.

For example:

A PVC anti-metal tag can use NTAG215, NTAG216 or NTAG 424 DNA.
A PET anti-metal label can also use any of these chips.
Chip selection should be based on data and security requirements.
Material selection should be based on physical and environmental requirements.

NTAG215 for General-Purpose NFC Anti-Metal Tags

NTAG215 is part of NXP’s NTAG21x family. It operates at 13.56 MHz and is compliant with NFC Forum Type 2 Tag and ISO/IEC 14443 Type A specifications.

NTAG215 provides 504 bytes of user memory.

It also supports features such as:

A manufacturer-programmed unique identifier
NDEF data storage
Configurable password protection
Read-only locking
NFC counter functions
UID mirroring
ECC-based originality signature
Fast-read commands

NTAG215 provides more memory than NTAG213 while remaining appropriate for mainstream NFC applications.

Some buyers incorrectly write the model as “NATG215.” The correct NXP product name is NTAG215.

When to Choose NTAG215

NTAG215 is suitable when the tag needs to store:

A standard or moderately long URL
A product identification record
Contact details
A small text record
Application-launch information
Device-pairing data
A serialized NDEF message

Common NTAG215 anti-metal applications include:

Metal equipment identification
Interactive product displays
Consumer electronics
Gaming accessories
Smart toys
Maintenance information
Digital manuals
Promotional products
Product registration

NTAG215 offers password-based access control, but it should not be treated as a cryptographic anti-counterfeiting chip. Password protection and static identifiers do not provide the same security model as NTAG 424 DNA.

NTAG216 for Larger NDEF Records

NTAG216 is also an NFC Forum Type 2 Tag IC from the NTAG21x family.

Its main advantage is its larger memory. NTAG216 provides 888 bytes of user memory, compared with 504 bytes for NTAG215.

NTAG216 supports the same general family features, including:

Unique identifier
NDEF compatibility
Password protection
Locking functions
NFC counter
UID and counter mirroring
ECC-based originality signature
Fast reading

When to Choose NTAG216

NTAG216 is useful when the application requires a larger NDEF message, such as:

A longer URL with tracking parameters
A more detailed digital business card
Multiple small NDEF records
Extended product information
Device configuration data
A multilingual text record
Larger offline data storage

Typical NTAG216 anti-metal applications include:

Machinery information labels
Smart equipment manuals
Metal display stands
Electronic product registration
Building maintenance points
Industrial asset records
Larger contact or configuration records

In many modern deployments, the tag only needs to store a short URL. The web server then provides the detailed content. In those cases, the extra memory of NTAG216 may not be necessary.

Choosing the largest memory by default can increase cost without improving user experience.

NTAG 424 DNA for Secure Authentication

NTAG 424 DNA is designed for applications requiring stronger security, privacy and product authentication.

Unlike NTAG215 and NTAG216, which are NFC Forum Type 2 tags, NTAG 424 DNA is an NFC Forum Type 4 Tag.

NXP specifies 416 bytes of memory organized as:

32-byte capability container
256-byte NDEF file
128-byte protected data file

The main value of NTAG 424 DNA is not large storage capacity. Its value comes from its cryptographic security architecture.

Key features include:

AES-128 cryptography
Secure Dynamic Messaging
Secure Unique NFC authentication
Three-pass mutual authentication
Protected data access
Encrypted communication options
Random ID and encrypted UID functions
NXP originality checks
Dynamic URL construction
Common Criteria EAL4 certification

How Secure Dynamic Messaging Works

With a basic NTAG215 or NTAG216 implementation, the phone normally reads static NDEF content. If the tag contains a URL, the same URL is generally returned at every tap unless the tag is rewritten.

NTAG 424 DNA can generate changing authentication data during an ordinary NFC read.

Depending on the configuration, the URL can include mirrored data such as:

Tag identification information
A tap counter
A unique message authentication code
Encrypted dynamic data

A backend server receives the dynamic URL parameters and verifies whether the cryptographic response is valid.

This makes copied static tag data much less useful. A counterfeit label may reproduce the printed design and static URL, but it cannot correctly generate the required cryptographic response without the original secure chip and keys.

Applications for NTAG 424 DNA Anti-Metal Tags

Combining NTAG 424 DNA with an anti-metal construction is useful when a secure NFC tag must be attached to a metal product, component or package.

Typical applications include:

Luxury goods authentication
Premium cosmetics in metal packaging
High-value electronics
Industrial spare parts
Medical devices
Pharmaceutical packaging components
Automotive parts
Secure maintenance records
Brand protection
Warranty activation
Controlled digital content
Loyalty programs
Supply-chain traceability
Reusable metal containers
Secure equipment identification

NTAG 424 DNA is especially relevant when the business needs to distinguish an authentic product from a copied label.

However, the chip is only one part of a secure system. A complete implementation also requires:

Secure key management
Proper chip personalization
A verification backend
Access-control design
Event monitoring
Rules for suspicious tap behavior
Secure manufacturing and data handling

Using an NTAG 424 DNA chip without correctly configuring its security functions may not provide the expected protection.

NTAG215 vs NTAG216 vs NTAG 424 DNA

Feature	NTAG215	NTAG216	NTAG 424 DNA
NFC Forum type	Type 2	Type 2	Type 4
User or application memory	504 bytes	888 bytes	416 bytes structured memory
Main advantage	Balanced memory and cost	Larger NDEF capacity	Cryptographic authentication
Password protection	Yes	Yes	Advanced AES-based access control
Dynamic secure authentication	No	No	Yes
Suitable for static URLs	Yes	Yes	Yes
Suitable for secure anti-counterfeiting	Limited	Limited	Yes, with a complete backend
Typical cost level	Standard	Standard to moderate	Higher
Best use	General NFC interaction	Larger data records	Authentication and secure experiences

The correct chip depends on the business requirement:

Choose NTAG215 for general NFC interaction with moderate memory.
Choose NTAG216 when the NDEF message genuinely needs more storage.
Choose NTAG 424 DNA when secure authentication is more important than memory size.

Common NFC Anti-Metal Tag Applications

Industrial Equipment Management

A PET anti-metal NFC label can be placed on a machine, motor, control cabinet or production tool.

A technician can tap the tag to access:

Equipment identification
Operating instructions
Maintenance history
Inspection forms
Spare-parts lists
Safety documents
Service videos

The NFC chip usually stores a URL or equipment identifier rather than the entire maintenance record.

IT Asset Identification

Anti-metal NFC tags can be attached to:

Servers
Desktop computers
Network switches
Storage devices
Metal laptop housings
Data-center racks

The tag can connect the physical asset to an asset-management system, service record or support page.

PET is commonly selected for this application because a thin and durable equipment label is often preferred.

Tool Tracking and Inspection

NFC anti-metal tags can identify tools and inspection points where operators interact with each item individually.

The user can tap the tag to:

Confirm an inspection
Open a checklist
Record maintenance
Report damage
View calibration status
Identify the assigned department

NFC is useful for intentional close-range interaction. For automatic bulk inventory counting, UHF RFID may be more suitable.

Consumer Electronics

Manufacturers can integrate NFC anti-metal tags into or onto electronic products for:

Product registration
Warranty activation
User manuals
App downloads
Wi-Fi or Bluetooth pairing support
Customer service
Authenticity verification

The tag must be tested in its final position because batteries, shielding, housings and internal metal components can influence NFC performance.

Metal Packaging

Metal tins, cosmetic containers, beverage-related promotional packages and premium gift boxes can interfere with normal NFC labels.

An anti-metal tag allows a brand to add:

Product stories
Authentication
Loyalty programs
Reorder links
Usage instructions
Campaign content
Supply-chain information

NTAG215 or NTAG216 may be adequate for general engagement. NTAG 424 DNA is more appropriate when authentication or controlled content is required.

Automotive Components

NFC anti-metal tags can be used on suitable automotive parts for:

Part identification
Installation instructions
Service history
Warranty registration
Component authentication
Digital product documentation

Automotive environments require careful validation for heat, fluids, abrasion, vibration and long-term adhesion.

Facility and Maintenance Points

An NFC anti-metal tag can be installed on:

Fire equipment cabinets
Electrical panels
HVAC systems
Elevators
Pumps
Valves
Metal doors
Safety stations

Employees can tap the tag to open a site-specific checklist or record an inspection.

Factors That Affect Reading Performance

Tag Size

A larger antenna usually offers more design flexibility and potentially better coupling with a smartphone.

Very small anti-metal tags may have a shorter or less consistent read range. They should be tested with the intended phone models and mounting object.

Ferrite Thickness

The ferrite layer must provide enough isolation from the metal.

A thin ferrite layer can reduce total thickness, but performance may become more sensitive to:

Metal type
Antenna dimensions
Smartphone position
Surface curvature
Adhesive thickness

Metal Type and Object Geometry

A tag may perform differently on:

Stainless steel
Aluminum
Painted steel
Curved pipe
Flat cabinet
Small metal tool
Large metal panel

Testing on a generic metal sheet does not fully reproduce every final application.

Tag Orientation

The user must place the phone’s NFC antenna close to the tag. The location of the phone antenna varies by model.

A clear NFC symbol or “Tap Here” instruction can improve user experience.

Adhesive and Mounting Gap

Adhesive thickness changes the physical spacing between the antenna, ferrite and metal surface. Changing the adhesive can therefore affect both bonding and RF performance.

Printing and Lamination

Metallic inks, foil layers and conductive decorative materials placed near the antenna can interfere with performance.

Printed graphics should be evaluated as part of the complete tag construction.

How to Specify an NFC Anti-Metal Tag

A clear request for quotation should include the following information.

Mounting surface

Specify:

Metal type
Painted or unpainted surface
Flat or curved shape
Surface texture
Available mounting area

Tag dimensions

Provide the maximum:

Length
Width
Diameter
Thickness

Face material

State whether the application requires:

PVC
PET
White surface
Transparent surface
Silver finish
Matte finish
Gloss finish

Chip

Select according to the application:

NTAG215
NTAG216
NTAG 424 DNA
Another NFC chip where technically appropriate

Data requirements

Explain whether the tag will store:

A URL
Product ID
Contact details
Device settings
Authentication data
Multiple NDEF records

Security requirements

Clarify whether the application needs:

Read-only locking
Password protection
Unique serialization
Tap counting
Dynamic URL authentication
Anti-counterfeiting
Tamper evidence
Backend verification

Environmental conditions

Provide expected exposure to:

Water
Cleaning chemicals
Oil
UV light
Heat
Cold
Abrasion
Outdoor weather
Repeated handling

Printing and encoding

Confirm whether the supplier must provide:

Logo printing
QR codes
Variable serial numbers
UID printing
NDEF encoding
URL encoding
Database association
NTAG 424 DNA personalization

Testing Before Mass Production

An NFC anti-metal tag should be tested on the actual product before mass production.

The test should include:

Apply the tag to the final metal surface.
Allow the adhesive to reach its specified bond strength.
Test multiple NFC-enabled Android phones and iPhones.
Test different tapping positions and orientations.
Verify data reading and website redirection.
Test tags before and after environmental exposure.
Check printing, edge lifting and surface wear.
Confirm serialized data and database matching.
Validate NTAG 424 DNA authentication with the production backend.
Repeat testing on several production samples.

The approved sample should define the complete construction, including chip, antenna, ferrite, face material, adhesive, printing and encoding.

Changing only one component may affect the final result.

Common Purchasing Mistakes

Selecting the chip only by memory size

More memory does not automatically mean a better tag.

A short URL may fit easily in NTAG215. NTAG216 is useful only when the application requires the additional capacity. NTAG 424 DNA should be selected for security rather than storage size.

Assuming every “waterproof” tag has the same durability

Water resistance depends on the finished construction, sealing, adhesive and test method.

A waterproof PVC face does not guarantee that the antenna edges or adhesive will survive long-term outdoor exposure.

Using a standard NFC sticker with extra adhesive foam

A simple spacer may produce acceptable results in a prototype, but it is less predictable than a tuned ferrite anti-metal construction.

Ignoring the final metal object

Performance on a flat steel test plate may not match performance on a small curved component or electronic enclosure.

Treating password protection as anti-counterfeiting

The password functions in NTAG215 and NTAG216 can restrict certain memory operations, but they are not equivalent to the AES-based dynamic authentication of NTAG 424 DNA.

Failing to build the verification backend

A secure chip does not independently decide whether a product is authentic. The server must validate the cryptographic response and apply appropriate business rules.

Final Recommendations

For a flexible, printable and economical on-metal NFC tag, a PVC construction may be appropriate, particularly for indoor promotional and consumer-facing applications.

For a thin, dimensionally stable and durable industrial label, PET is often the better starting point.

For chip selection:

Use NTAG215 for standard URLs, identification and general interactive applications.
Use NTAG216 when additional NDEF storage is genuinely required.
Use NTAG 424 DNA for secure authentication, anti-counterfeiting and protected digital experiences.

The final product should not be selected by face material or chip name alone.

Reliable NFC anti-metal performance depends on the complete system:

Correctly tuned antenna
Suitable ferrite layer
Appropriate PVC or PET face material
Compatible adhesive
Protected printing
Proper data encoding
Realistic testing on the final metal object

Frequently Asked Questions

What material is used in an NFC anti-metal tag?

A typical anti-metal NFC label contains a PVC or PET face, an NFC chip and antenna, a ferrite isolation layer, pressure-sensitive adhesive and a release liner. Additional coatings or overlaminates may be added for protection.

Is PVC or PET better for an NFC tag?

PVC is generally preferred for flexibility, conformability and economical custom printing. PET is often preferred for thin industrial labels requiring better dimensional stability, abrasion resistance and environmental durability.

Neither material is universally better. The correct choice depends on the application.

What is the difference between NTAG215 and NTAG216?

NTAG215 provides 504 bytes of user memory, while NTAG216 provides 888 bytes. Their general communication and security features are similar. NTAG216 is mainly selected when a larger NDEF record is required.

Is NATG215 a real NFC chip?

“NATG215” is normally a spelling error. The correct NXP chip name is NTAG215.

Is NTAG 424 DNA better than NTAG216?

They serve different purposes.

NTAG216 provides a larger general-purpose user memory area. NTAG 424 DNA provides advanced AES-based security and dynamic authentication.

For a normal URL or digital business card, NTAG216 may be sufficient. For secure product authentication, NTAG 424 DNA is the more appropriate choice.

Can NTAG215 be used for anti-counterfeiting?

NTAG215 includes a unique identifier, originality signature and password-related features, but it does not provide the same dynamic cryptographic authentication as NTAG 424 DNA.

It may support basic identification, but it should not be treated as a high-security anti-counterfeiting solution.

Can NFC anti-metal tags work on stainless steel?

Yes, provided the tag has a suitable ferrite layer and antenna design. The finished tag should still be tested on the actual stainless-steel component.

Can an anti-metal NFC tag also work on plastic?

Many on-metal NFC tags can also be read when applied to plastic, glass or other non-metal surfaces. However, performance may differ because the antenna was tuned for an anti-metal construction.

What is the reading distance of an NFC anti-metal tag?

The practical reading distance depends on antenna size, ferrite, metal surface, phone model and tag orientation. NFC is a short-range technology, and smartphone interaction normally requires the device to be placed close to the tag.

Does NTAG 424 DNA work with smartphones?

NTAG 424 DNA is designed for NFC-enabled devices and supports standard NDEF reading. The user experience and authentication workflow still depend on correct tag configuration, phone compatibility and backend implementation.

Can an NFC anti-metal tag be printed with a QR code?

Yes. A QR code, serial number, logo and NFC tap symbol can be printed on the PVC or PET face. The QR code can provide an alternative access method for users who do not activate NFC.