Clamshell vs. Printable CR80 Proximity Cards: Which Should You Buy?

When you order 125 kHz proximity cards, you usually have two choices: a thick clamshell access card or a thin, printable CR80 prox card (also called an ISO proximity card). Both carry the same kind of chip and antenna, and both can carry the same credential data if they are the same format. A 26-bit H10301 clamshell card and a 26-bit H10301 printable card read the same way on a compatible reader.

What differs is the card body: how thick it is, how it holds up, whether you can print on it, and how people carry it. This guide compares clamshell vs CR80 cards and ends with clear "choose X if" guidance, so you can order the right one the first time.

Free samples are available so you can test compatibility before you buy. Request a free clamshell or printable CR80 prox card to test on your reader

 

What Is a Clamshell Proximity Card?

A clamshell card is made from two molded plastic halves, usually ABS or a similar rigid material, sealed around the RFID chip and antenna coil. The name comes from the way the two halves close together like a shell.

Key traits:

• Thickness: typically about 0.070 in. (1.8 mm), more than twice as thick as a standard credit card
• Surface: often has a slightly textured or uneven face and is not made for printers
• Durability: a rigid shell that resists flexing, cracking and daily abuse
• Carry style: usually worn on a clip, lanyard or key ring, or kept in a pocket
• Classic equivalent: the thick card style often compared to the HID ProxCard II (1326)

Clamshell cards are the workhorse of door-only access. Nobody needs to see a name or photo on the card. It just has to read every time and survive years of use.

 

What Is a Printable CR80 Proximity Card?

A printable CR80 card is built from thin PVC or composite layers laminated around the chip and antenna. CR80 is the standard ID-1 card size: 3.375 x 2.125 in. (85.6 x 54 mm), the same as a credit card.

Key traits:

• Thickness: typically about 0.030 in. (0.76 mm), often called 30 mil, which is standard ISO card thickness
• Surface: a smooth, glossy white face made for a direct-to-card badge printer
• Printable: works with photo IDs, names, logos, department colors and barcodes
• Carry style: fits a wallet, standard badge holder or reel
• Classic equivalent: the thin card style often compared to the HID ISOProx II (1386)

These cards are often called direct-print prox cards or badge printable prox cards because they let one credential work as both a door key and a visual ID badge.

 

Clamshell vs. CR80: Side-by-Side Comparison

Does Thickness Affect Read Range or Compatibility?

Compatibility: no. Compatibility depends on frequency (125 kHz) and credential format (for example, 26-bit H10301), not on the card body. A thick vs thin prox card programmed with the same format and facility code reads the same on readers such as the ProxPoint Plus, MiniProx and Thinline II. These are the readers that also work with standard 1326 and 1386 style cards.

Read range: sometimes, a little. A thicker card body can hold a larger antenna coil, so clamshell cards may read from slightly farther away on some readers. In practice the difference is usually small, and reader model, mounting surface and nearby metal matter more. If read range is critical at a specific door, test both styles on that reader.

 

How to Choose: Clamshell or Printable CR80?

Choose a clamshell card if:

• The card is only a door key, with no visual ID required
• Users are in rough environments, like warehouses, job sites, parking gates or maintenance crews
• Cards will live on key rings, clips or lanyards rather than in wallets
• You want a rigid card that resists bending and cracking over years of use
• You're replacing existing thick cards and want users to carry the same thing

Shop 26-bit proximity clamshell cards

Choose a printable CR80 card if:

• You need photo ID badges for employees, students, contractors or volunteers
• Staff must visibly wear identification on site (common in healthcare, schools and offices)
• You want company branding, names, titles or color-coded access levels on the card
• Users want a card that fits in a wallet or phone case
• You already own, or plan to buy, a badge printer

Shop 26-bit proximity printable CR80 cards

Use both if:

Many facilities do. A common setup is printable CR80 photo badges for employees and clamshell cards for temporary workers, vendors, gate users or shared fleet keys. As long as both are ordered in the same format, and with the right facility code, they work on the same readers and panel.

 

Printing on CR80 Prox Cards: What You Need to Know

Printable proximity cards are made for direct-to-card badge printers, not desktop office printers.

• Inkjet printers will not work on standard CR80s. Standard inkjet and laser printers can't feed or bond to regular PVC cards correctly. If you are planning to use an Inkjet printer, shop our specially-designed 26-bit Inkjet printable CR80 cards.
• Use a dye-sublimation or retransfer card printer. Evolis badge printers and supplies are built for regular CR80 cards and handle photo IDs, logos and text.
• Prox cards have an embedded antenna and chip, so the surface may not be perfectly flat. For edge-to-edge photo quality on prox cards, many badge shops prefer a retransfer printer, which prints onto a film and then bonds it to the card.
• Never run a clamshell card through a badge printer. At about 0.070 in. it is far thicker than most printers accept and can jam or damage the print head.

Don't have a printer? Custom printing is available. Contact AuthorizID by phone or email for pricing and options on printed logos or artwork.

p: (970) 682-0765

e: support@authoriz-id.com

 

Durability and Carry: Badge Holders, Clips and Reels

How users carry the card effects how long it lasts.

• Printable CR80 cards fit standard badge holders, slot clips, lanyards and retractable reels. A clear holder also protects the printed face from scratches and fading.
• Clamshell cards are thicker than standard cards, so a regular-size badge holder may not fit. Use a clip or strap, or a holder made for thicker cards.
• Avoid bending either card. A sharp bend can break the antenna, and it's the most common cause of a "dead" card. Thin CR80 cards are more likely to be bent in back pockets.

Browse ID badge supplies for holders, clips, lanyards and reels that match either card style.

Facility Codes and Custom Ordering

Card style doesn't change how your system identifies a credential. In a 26-bit H10301 card, the data includes an 8-bit facility code (0–255) and a 16-bit card number (0–65,535). Your access control panel uses the facility code to accept or reject cards and the card number to identify the cardholder.

When adding cards to an existing system:

• Match the facility code used by your current cards, unless your panel accepts multiple facility codes
• Avoid duplicate card numbers with cards already enrolled
• Order custom facility code cards when your system needs a specific code. Both the clamshell and printable CR80 collections offer a custom option for this.

Not sure what facility code you use? Your panel software, your integrator or a card you already have can usually tell you. Still in doubt? Send us an email at support@authoriz-id.com, and one of our U.S.-based technical support agents will happily walk you through it. 

 

Clamshell and Printable Cards in Other Formats

This comparison focuses on 26-bit H10301, the most common prox format, but the thick vs. thin decision applies to other formats too. Systems from AWID, Keri, Kantech, DoorKing, Farpointe and others use their own proprietary formats, and those credentials are often offered in both clamshell and printable CR80 styles.

If your system doesn't use standard 26-bit, start with the proprietary formats collection to find your format and see which card styles are available.

 

Quick Summary: Which Should You Buy?

• Door-only access, rough use, keychain or clip carry: clamshell
• Photo ID, branding, wallet carry, badge printer on site: printable CR80
• Mixed users: both, ordered in the same format and facility code
• Not sure of your format: test a sample before you order in bulk

Either way, the card body is a practical choice. The credential format and facility code decide whether it works on your system.

 

Test Clamshell and CR80 Prox Cards Before You Order

The surest way to confirm a credential works with your system is to test one on your own reader. A sample card lets you check that your reader picks up the format, compare the read range of thick and thin cards at your door, and see how the printable face looks in your badge printer.

Get in touch to claim a free sample prox card for your system