Self-adhesive printer label Brady M21-375-423, polyester, 6.4 mm x 9.525 mm, white

Brady M21-375-423 is a self-adhesive printer label made from durable polyester with a glossy white finish. Each label measures 6.4 mm wide by 9.525 mm high and is supplied in a cartridge format that combines label material and matching thermal transfer ribbon. The polyester construction and permanent acrylic adhesive make these labels suitable for thermal/transfer and compatible label printers and for applications requiring a narrow, high-strength identification tag.

Advantages

The polyester face material provides strong chemical and abrasion resistance while retaining print clarity. Permanent acrylic adhesive guarantees long-term attachment to cables, wires and components. The glossy white surface offers good contrast for thermal transfer printing, enabling clear bar codes and alphanumeric text. The all-in-one cartridge simplifies media loading and reduces downtime.

Suitable for

• Cable and wire identification in electrical panels
• PCB and small electronic component marking
• Bar code and serial number labels for tight spaces
• Rating plates and small durable asset tags

Key specifications

• Material: polyester face with permanent acrylic adhesive
• Color: glossy white
• Label dimensions: 6.4 mm (width) × 9.525 mm (height)
• Printable by thermal transfer printers with compatible ribbon
• Environmental characteristics: halogen-free per relevant standards; chemical and abrasion resistant
• Approvals: UL recognized and CSA accepted; conforms to RoHS requirements

How to use

Install the cartridge into a compatible Brady/M-series or compatible thermal transfer label printer following the printer manufacturer’s cartridge-loading instructions. Design labels in your printing software to match the 6.4 mm × 9.525 mm dimensions, select appropriate print speed and heat settings for polyester media, and perform a test print to verify legibility. Apply printed labels to clean, dry surfaces and press firmly to ensure full adhesion. For wires or cables, position the label where it will not be subjected to repeated flexing at the attachment point.

Usage recommendations

For best durability, use thermal transfer ribbons specified for polyester materials, avoid applying labels to oily or heavily textured surfaces, and allow adhesive to set for several hours before exposing to harsh environments. When labeling PCBs or small components, ensure the surface temperature is within printer and label specifications and avoid direct soldering contact with printed areas.