How to Label Cables and Wires in Dielectric Fluid

In immersion cooling systems, identification still underpins safe, efficient work. The difference is the environment. In a single phase dielectric cooling fluid, labels for cables and wires are fully immersed for long periods, and every material you introduce must respect both performance and fluid integrity.

That changes how you design your cable identification scheme, which materials you select for cable and wire markers, and which printers and printing technology you use for those labels.

At first glance, labeling inside an immersion tank looks simple: you want a clear cable label or tag on each cable or harness, a reliable way to attach it, and a format that matches your documentation and cable labeling software. In dielectric fluid, two additional risks appear.

So the real question is not just how to label a cable or wire, but how to label it in a way that protects both long-term readability and the integrity of the dielectric fluid.

Silver Fox® has addressed this challenge directly. Legend™ tie-on labels have been tested for resistance to Castrol ON single phase dielectric cooling fluids. This means they can be specified for use in immersion cooling systems that use Castrol ON, regardless of who manufactured the tank itself.

Because Legend™ is a tie-on format, it behaves like a small, robust cable tag. You secure it with a cable tie around the cable or harness, which gives you:

For operators, that means labeling is no longer the weak link when adopting advanced dielectric cooling technology with Castrol ON™.

Legend™ tie-on labels are available in two main variants. Both have been shown to be resistant to Castrol ON dielectric cooling fluid. The choice depends on how you want to print your cable labels and cable wire markers.

Legend™ Laser tie-on labels

Printable using a standard office laser printer, supplied in sheet format so you can print many labels at once. Ideal when you want to use existing printer hardware while still working from structured data.

Legend™ Thermal tie-on labels

Printable using the Fox-in-a-Box® thermal transfer printer system, with very sharp, durable print fully integrated with Labacus Innovator® industrial label printing software.

Together, Fox-in-a-Box® and Labacus Innovator® form a complete identification printer platform. The same system can act as:

• A cable label maker for inside and outside the immersion tank.
• A thermal transfer label printer for wrap around cable labels and self laminating cable labels.
• A cable labeling machine for printable cable labels, cable tag labels and heat shrink cable labels across the wider facility.

Free remote training and free remote support help your team get up to speed, and you benefit from free lifetime feature updates for Labacus Innovator® so your industrial label printing software keeps pace with your needs.

When you plan labels for cables and wires in an immersion cooling tank that uses Castrol ON fluid, a simple workflow helps keep everything under control.

1. 1

   Define your identification scheme

   Decide what each label needs to show – for example system or tank identifier, rack or position reference, circuit or cable ID, and destination or function. Align this with the cable labels on patch panels, labels for Ethernet cables, and other labels for cables and wires elsewhere in the system so IDs remain consistent end-to-end.

2. 2

   Build your data set

   Use Labacus Innovator® as your cable label software to build the data set that will drive your labels. Import IDs from CSV, XLS or XLSX files, generate structured sequences for cable wire labels, and reuse the same IDs across multiple label types from tie-on labels to wrap around cable labels.

3. 3

   Choose your Legend™ tie-on format

   Pick the Legend™ variant that fits your workflow: Legend Laser tie-on if you want to print on a standard laser printer, or Legend Thermal tie-on if you prefer a dedicated thermal transfer label printer in a Fox-in-a-Box® system. Both are suitable for immersion cooling systems that use Castrol ON dielectric fluid.

4. 4

   Print the labels

   For Legend Laser tie-on labels, load sheets into your laser printer, select the correct template in Labacus Innovator® and print a test sheet to confirm alignment and readability. For Legend Thermal tie-on labels, load the material into Fox-in-a-Box®, select the required layout and data and print using the thermal transfer printer for high contrast, durable text.

5. 5

   Attach labels to cables and harnesses

   Before the tank is filled or refilled, use suitable cable ties to secure each Legend™ tie-on label to the correct cable or harness. Position labels where they will be readable once everything is installed and tighten cable ties enough to hold the label securely without damaging the cable jacket.

6. 6

   Verify readability and consistency

   Carry out a simple check before introducing the fluid. Confirm each required cable has a label, check that the information matches your design documents, and ensure text is legible, consistent and not cramped. If helpful, capture photos at this stage to support future maintenance and audits.

The cables in the immersion tank are only part of your infrastructure. Around the tank you still have patch panels and network racks, fibre trays and distribution frames, and power and control panels that support the cooling system and IT load.

Using Fox-in-a-Box® and Labacus Innovator®, you can extend the same identification scheme to:

This gives you a single, consistent approach to labels for cables and wires across immersion tanks, racks and supporting systems, all driven by one data set in your cable labeling software.

Castrol ON™ immersion cooling fluids are part of a broader effort to reduce total energy consumption, improve cooling efficiency and enable heat reuse, reduce water usage in cooling systems, and support higher density computing without increasing risk.

Silver Fox® is committed to supporting that shift with identification solutions that match the same ambition. Legend™ tie-on labels tested in Castrol ON are one practical example, helping to:

In summary, labeling cables and wires in dielectric fluid demands materials and printers that can cope with full immersion and protect fluid integrity. Legend™ tie-on labels that have been shown to be resistant to Castrol ON dielectric cooling fluid give you a proven way to label cables in any suitable immersion tank that uses Castrol ON™. Fox-in-a-Box® and Labacus Innovator® provide the printers and printing technology to manage those labels alongside the rest of your network and power infrastructure.