How are RFID tag comparisons structured?

Each comparison provides a side-by-side analysis of two RFID tag ICs or technologies, covering memory capacity, read sensitivity, read range, protocol features, pricing, and recommended applications. A summary recommendation helps you quickly decide which option fits your requirements.

What is a cross-technology comparison?

Cross-technology comparisons evaluate RFID against other identification technologies such as barcodes, QR codes, NFC, BLE beacons, and GPS. These help you decide whether RFID is the right technology for your use case or if a combination approach would be more effective.

Wet Inlay vs Dry Inlay — So sánh RFID

Wet Inlay vs Dry Inlay: Understanding RFID Tag Construction

The distinction between wet and dry inlays is the first specification decision when procuring raw RFID tag components. It affects the conversion process, equipment compatibility, label construction, and per-unit cost at every stage of the supply chain.

Overview

An RFID inlay is the core component of a passive UHF or HF tag: a microchip bonded to a printed antenna on a flexible PET or polyimide substrate. The inlay converts RF energy from a reader into chip power and modulates a backscatter response.

A dry inlay is the antenna-chip substrate alone — no adhesive, no release liner. Dry inlays are sold as individual pieces or on a roll and must be converted (laminated into a label or embedded into a card) by a downstream converter. They are the input material for label manufacturers.

A wet inlay is a dry inlay with a pressure-sensitive adhesive (PSA) applied to the back and a silicone-coated release liner protecting the adhesive. Wet inlays are ready to be applied directly to a product or laminated into a finished label without additional adhesive application equipment.

Key Differences

Adhesive: Dry inlays have no adhesive — they require a separate lamination step. Wet inlays have factory-applied PSA and are ready to apply directly or laminate.
Conversion requirement: Dry inlays require a converter with laminating equipment to produce finished labels. Wet inlays can be used as-is or with simpler lamination (face stock added to the liner side).
Per-unit cost: Dry inlays are cheaper per unit because no adhesive or liner material is added. Wet inlays carry a small premium ($0.01–$0.03) for the PSA and liner.
Storage: Dry inlays are stored flat and do not require refrigeration or special humidity control. Wet inlays with aggressive PSA require controlled storage to prevent premature tack.
Application flexibility: Dry inlays can be encapsulated in cards, embedded in packaging during manufacture, or laminated with a wide variety of face stocks. Wet inlays are optimised for adhesive label applications.
Printer-encoder compatibility: Printer-encoder production lines (Zebra, Honeywell) that print-and-encode finished RFID labels typically use web-converted labels made from wet inlays, not raw dry inlays.

Technical Comparison

Attribute	Dry Inlay	Wet Inlay
Adhesive	None	Pressure-sensitive (factory-applied)
Release liner	None	Yes (silicone-coated paper or PET)
Conversion required	Yes (lamination needed)	Optional (ready to use)
Per-unit cost	Lower	Higher (adhesive + liner)
Typical cost difference	Baseline	+$0.01–$0.03
Storage requirements	Standard	Controlled (PSA sensitivity)
Primary buyer	Label converters	Retailers, brand owners, DC operators
End-use application	Cards, embedded packaging, custom labels	Adhesive labels, printer-encoder rolls
Form factor options	Sheet, roll, die-cut	Roll (label format)
Printer-encoder compatible	No (requires conversion first)	Yes (converted to label format)

Use Cases

Dry inlays are specified when: - You are a label converter producing finished RFID labels and need maximum design flexibility in face stock and adhesive selection - Inlays will be embedded in card laminate (hotel keys, ID cards, transit cards) where adhesive would interfere with lamination - Inlays will be moulded into hard tag housings where no adhesive is needed - Cost optimisation at very high volumes justifies the additional conversion infrastructure

Wet inlays are specified when: - You are applying inlays directly to products without additional conversion equipment - You are a label converter using a simpler lamination process (adding a face stock without re-applying adhesive) - The end application is a standard adhesive label applied to shipping cases, retail items, or pharmaceutical packaging - Printer-encoder roll format labels will be produced using these inlays as the base

When to Choose Each

Choose dry inlays if your organisation operates label-converting equipment and wants maximum flexibility in adhesive formulation, face stock selection, and label construction — or if inlays will be embedded in card or hard-tag form factors.

Choose wet inlays if your organisation needs ready-to-apply or easy-to-laminate inlays without adhesive application equipment. Most retail and logistics RFID programmes that source pre-converted labels from label vendors are ultimately using wet inlays at the converter level.

Conclusion

Wet vs dry is an upstream specification decision that affects the conversion and labelling supply chain, not the RFID performance. Both deliver identical RF performance — the antenna and chip are identical; only the adhesive and liner differ. The correct choice depends on your position in the supply chain: dry inlays for converters with full lamination capability, wet inlays for converters with simpler lamination workflows or for direct application.