RFID tags need radio waves for utmost functionality. A good UHF tag works well on materials like cardboard, plastic, or wood. However, metal surfaces interfere with the RF signal, reducing its strength, and so we require specially designed RFID tags for metal surfaces.
Selecting the right RFID tag for both metal and non-metal surfaces is an important task for any business looking to deploy RFID technology. RFID metal tags are designed for metal surfaces and have a protected layer to keep the antenna separate from the metal surface. RFID tags for non-metal items are thinner and cheaper because they don’t require an additional layer of material to protect them from metal interference. When the correct tag is used for the appropriate surface, items can be tracked reliably without multiple scans.
Let’s explore how to select the best RFID tag for metal and non-metal surfaces, to ensure better RFID reading and accuracy in data capture.
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When the Wrong RFID Tag Meets the Wrong Surface
Initially, RFID deployment goes well, and you might not notice any difference. Workers tag easy items like boxes or plastic bins and scan them, and the whole system works as expected. The counts are right. The whole process is visible.
The problem starts when a worker needs to tag different surface items like metal shelves, metal cages, tools, or equipment. Now the problem arises: some items don’t get read when you scan a group. Some tags only work when you scan them up close. Workers have to scan again and again, change how they hold the scanner, and try again. Over time, people start to trust the automated system less.
Metals and liquids interfere with radio signals emitted by the tag’s antennas, absorb them, and make it more difficult for the scanner to detect them. This means the range of tag detection is decreased, and they may not be detected consistently.
How to Choose the Right RFID Tag for Various Surfaces
1. For Metal Surfaces: Use Tags Designed for Metal
Metal interference with radio frequency signals, and a normal paper tag placed directly on the metal does not stand a chance. The signal strength became weaker, and the read became unreliable. That’s exactly why the metal tag comes into the picture. They built with a special isolation layer that is present between the tag and the surface, blocking the interference that is created by the metal surface. Here are a couple that get the job done:
a. EDGE-11025 RFID UHF: Suitable for machinery, metal racks, and factory tools. These tags typically fall in the price range of INR 30-35.
b. EXO600 UHF RFID: Commonly used for IT equipment and metal cabinets. These tags typically fall in the price range of INR 25-30.
You can find them at competitive industrial pricing on EnCstore, a trusted supplier for RFID tags and tracking solutions.
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2. For Non-Metal Surfaces, Choose RAIN RFID Labels
Cartons, plastic bins, apparel, and packaged goods typically require standard UHF RFID labels. In these cases, the priority is high-volume tagging with consistent read performance and cost efficiency.
For Example:
a. UHF RFID Self-Adhesive Polyester Labels/Tags– Ideal for apparel and carton-level tagging.
b. UHF RFID Inventory Label, 4 x 4 inch, Alien Higgs 3– Widely used for warehouse case tracking.
c. UHF RFID Pallet & Container Tracking Tags– Suitable for reusable plastic crates.
These non-metal-mount RFID labels, paper, and polyester labels typically fall in the price range of INR 3-6, depending on specifications and order quantity. However, RFID hard tags for non-metal surfaces like wooden pallets, crates, etc., cost around INR 15-18.
3. In Mixed Environments: Choose Based on the Read Zone
Many facilities combine metal shelving with carton flow or plastic bins in the same operational area. In these situations, tag selection should depend on how and where the reading happens.
Key factors to evaluate include:
a. Whether reading is done via fixed portals or handheld devices
b. Required read distance
c. Mounting method (adhesive, screw, or tie)
d. Orientation flexibility
4. For Harsh or Outdoor Conditions: Prioritise Durability, Choose Hard Tags
Outdoor yards, cold storage facilities, and high-activity manufacturing floors require rugged tags that can withstand environmental stress.
For example:
a. UHF RFID ABS On-Metal Hard tags: Suitable for heavy outdoor assets.
b. Exo 800 ABS– Designed for shipping containers and transport equipment.
These Hard RFID tags typically fall in the price range of INR 25-28, depending on specifications and order quantity.
Beyond the Surface: How an RFID Tag is Optimized to Function Effectively on the Floor
To ensure that your RFID technology deployment goes well, there are simple steps you can take to optimize your RFID infrastructure. Some steps to ensure that RFID tags work well in any environment are as follows:
1. Align Tag Capability with Real-World Read Distance
A tag that performs well in controlled testing may struggle when pallets move quickly through a dock door portal. Fixed reader zones, conveyor speed, and environmental interference all influence how effectively a tag responds.
2. Standardize Tag Placement for Consistent Reads
Even the correct tag can underperform if applied inconsistently. Placement too close to metal edges, liquid-filled products, or carton folds can weaken the signal. Establishing a defined placement position and orientation across all assets ensures more organised bulk reads and faster manual audits. Consistency at this level directly impacts inventory accuracy.
3. Manage Tag Density in High-SKU Environments
High-SKU facilities introduce signal congestion. When hundreds of tags respond simultaneously, weak anti-collision handling slows down scans and creates read inconsistencies. Selecting tags that remain stable in dense environments improves read reliability, shortens audit duration, and supports accurate stock visibility.
4. Match Tag Durability to Asset Lifecycle
A disposable carton does not require an industrial-grade tag. However, a reusable metal cage circulating through operations for years demands long-term durability. Aligning tag construction with the asset’s lifecycle prevents repeated re-tagging costs and eliminates long-term visibility gaps.
Operational Alignment Drives Reliability
When read distance, placement consistency, tag density handling, and lifecycle durability are aligned with surface type, RFID performance becomes predictable. The system operates dependably, audits move faster, and dispatch accuracy improves, allowing RFID to function as a stable operational infrastructure rather than a recurring troubleshooting concern.
The process itself is straightforward:
a.Connect the tag to the surface.
b.Coordinate it with the actual reading distance.
c. Normalise positioning.
d. Select durability based on the expected lifespan of the asset.
You can find them at the best competitive industrial pricing on EnCstore, a trusted supplier for RFID tags and tracking solutions.
In summary, when the tag is selected accurately, everything feels different and perfect. Metal surface items were scanned consistently. Cartons pass through gateways without rework. High-SKU shelves read clearly. Cycle counts are completed more quickly. The system stabilises instead of remaining reactive. Choosing the right RFID tags for metal and non-metal surfaces thus becomes crucial, and so does optimizing the RFID infrastructure, from RFID readers to antennas and middleware.
EnCstore, as a market-leading firm in AIDC sales, offers you consultation as well as premium RFID hardware to get started with your RFID deployments. Get in touch with our RFID experts today! Contact us: www.encstore.com/contact-us.
Frequently Asked Questions
● Can I use the same RFID tag for metal and non-metal items?
No. Metal and non-metal surfaces require different tags to ensure consistent reads and avoid signal interference. However, one can use a mount on-metal tag on non-metallic asset surfaces without any issue. It just would be costlier than using simple RAIN RFID tags/labels.
● Why do some items still not scan even with RFID tags?
Incorrect tag placement, surface mismatch, or high tag density can reduce read reliability. Interfernece and collision issues between tags, readers and readers, etc. also affect reading efficiency of an RFID system.
● How do I know which RFID tag is right for my assets?
Match the tag to the surface type, operational read distance, and asset durability requirements for best results. Choose specially design tags for particular application, say anti-metal tags for metal assets, hard tags for outdoor use and laundry tags and taffeta tags for linens.
● How does an RFID tag get damaged?
An RFID tag gets damaged if the antenna lines are broken, the antenna is detuned (near metals), or the RFID chip on the tag is destroyed. The RFID tag is damaged due to excessive heat, snow, or water. Bending and crushing the tag will also destroy it.
● How to prevent RFID tag damage?
To prevent an RFID tag from getting damaged, ensure that the antenna and chip are intact and that the tag is not put under extreme load, heat, etc. Antenna detuning or passing electricity to the tag IC can also damage the tag; to prevent that as well. Use RFID anti-metal tags for metal assets and Flag tags for liquid assets such as vaccines, blood test tubes, etc.
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