DPP Data Carriers: QR, NFC, RFID or Watermark?

The data carrier is the part of a Digital Product Passport everyone pictures first, and it should be decided close to last. It carries no data of its own — it encodes an identifier that resolves to the record. Get identity right and the carrier becomes a swappable detail; get it wrong and no carrier saves you.

That said, the choice is not arbitrary. A printed code on a workwear label that will be industrially laundered two hundred times is a decision with a predictable ending.

What does a carrier actually have to do?

Three requirements matter, and they pull in different directions.

• Readable by the audiences who need it. A consumer has a phone. A recycler may have a phone, or an industrial scanner, or gloves and poor lighting.
• Durable for the product lifetime. The passport matters most at end-of-life, which is precisely when a printed label has had the longest to degrade.
• Economic at your volume. A cent per unit is nothing on a battery module and prohibitive on a garment care label.

How do the options compare?

The row that surprises people is the last column of the QR row. It is the default not because it is technically superior but because it removes a dependency: nobody needs to own anything to read it. For a passport whose whole point is to still work for a stranger in fifteen years, that property outweighs most technical advantages.

When is a QR code not enough?

Four situations genuinely justify the cost of something else.

The surface will not survive

Industrial laundering, abrasive environments, prolonged UV, grease and solvents all destroy printed codes. Workwear, tools and automotive components frequently fall here. An NFC tag sealed inside the product outlives the surface.

There is no line of sight

A battery module inside a sealed pack cannot present a visible code. NFC and RFID read through most non-metallic materials, which is why they dominate where the item is enclosed by design.

Counterfeiting is a real threat

A QR code is trivially copyable — that is inherent to a printed pattern. It authenticates nothing on its own. Where authentication matters, a cryptographically capable NFC tag that can prove it holds a secret is a materially different control.

Reading happens at industrial scale

A sorting facility processing thousands of items an hour cannot photograph each one. RFID reads in bulk without orientation, which is why waste and logistics operations favour it despite the reader infrastructure cost.

What should the carrier actually encode?

A resolvable URI, not a raw identifier and not a proprietary code. The standard here is GS1 Digital Link, which expresses a product identifier as a web address.

The practical consequence is that a phone camera resolves it with no special software, while a supply chain system can parse the same string for its GTIN and serial. One encoding, two entirely different consumers, no translation layer.

Choosing for your product group

The abstract comparison only gets you so far. These are the patterns that hold across the product groups currently heading for delegated acts.

Two of these deserve comment. Steel is the clearest case where a label is simply not an option — the material is cut, welded and coated, so identity has to be marked into the metal or carried in accompanying data rather than on the surface. Textiles are the case where the durability question is most often underestimated, because a care label that survives twenty domestic washes may not survive two hundred industrial ones.

Placement and durability

The ESPR permits the carrier on the product, its packaging or its documentation. For circularity purposes the product itself is almost always the right answer, because packaging and documentation are discarded long before the product reaches end-of-life — which is exactly when the passport is needed.

Test durability against the actual product life, not a laboratory abrasion cycle. If the item is expected to last fifteen years outdoors, the honest question is whether the code will be readable in year fourteen by someone deciding whether to repair or discard it.