AI and machine learning workloads have changed the thermal profile of the modern data centre. Rack power densities are increasing steadily, and in many facilities they now exceed the operating range where air cooling alone can provide predictable, efficient temperature control. Liquid cooling has emerged as a practical solution, but its adoption introduces new thermal and safety challenges inside the data hall. Coolant lines, manifolds, and high-temperature zones must coexist with sensitive electronics, often within existing facility layouts, giving rise to challenges related to heat containment, protection, and system reliability. At Mid-Mountain Materials, Inc., we view this transition as a materials problem as much as a mechanical issue, one that can be addressed through heat resistant fabrics that support safe, reliable, and scalable liquid cooling.

Managing the Thermal Side Effects of Liquid Cooling

Liquid cooling is highly effective at removing heat directly from processors, but it also changes how heat is distributed within a data hall. Thermal energy is no longer managed primarily by airflow; it is carried through hoses, manifolds, and return lines that move significant heat through the rack and surrounding space. Hot coolant return lines, in particular, can radiate heat back into the room if uninsulated, adding to the ambient load and undermining temperature stability in adjacent air-cooled equipment. Mid-Mountain’s HYTEX® sleeving can be used to insulate liquid cooling lines and limit radiant heat transfer, keeping thermal energy contained within the liquid loop and directing it efficiently to the heat exchanger rather than allowing it to disperse back into the environment.

Why Radiant Heat Control Is a Practical Requirement

Radiant heat from liquid cooling infrastructure is often overlooked during early deployments, yet it has measurable operational consequences when coolant loops, return lines, and manifolds are distributed across larger rack populations. Even modest heat leakage from liquid cooling infrastructure can affect cooling performance and reliability across adjacent racks sharing airflow paths and return air volumes.

Unmanaged radiant heat can contribute to:

  • Higher ambient temperatures around racks
  • Reduced efficiency during hybrid air and liquid cooling operation
  • Increased stress on legacy cooling infrastructure.

Applying high-temperature textile insulation, such as HYTEX® sleeving, provides a straightforward way to control radiant heat without adding bulk or restricting routing, which is especially important during phased rollouts where liquid-cooled and air-cooled systems must operate side by side.

Supporting Phased Transitions and Mixed Cooling Environments

Most data centres do not transition to liquid cooling in a single step, particularly those operating at scale or within existing buildings. High-density AI racks are typically introduced incrementally, often alongside existing air-cooled equipment, forming mixed cooling environments with new operational considerations. In these settings, coolant lines and liquid-cooled hardware must operate in close proximity to legacy infrastructure, increasing exposure to risks such as fluid leaks, condensation, and localized mechanical failure.

ARMATEX® Coated Fabrics from Mid-Mountain Materials, Inc. help manage these risks by serving as fluid-resistant, high-temperature barriers within the data hall. Used as partitions, curtains, or localized shrouds, ARMATEX® materials provide targeted protection for adjacent equipment during peak cooling cycles, containing leaks or preventing condensation on chilled lines before moisture affects sensitive systems. Their flexibility allows them to conform to tight spaces and complex geometries, making integration simpler than rigid panels or enclosures. This same flexibility supports higher-density layouts, enabling closer component spacing while maintaining separation and protection as rack interiors become increasingly crowded.

Material Performance Inside the Rack

Liquid cooling places specific mechanical and thermal demands on materials inside the rack. Coolant lines must tolerate tight bend radii, vibration, and proximity to sensitive electronics and preserve insulation performance and structural integrity over long operating cycles.

Mid-Mountain addresses these challenges with engineered textile solutions designed for rack-level integration:

  • HYTEX® 1000 and 1400 sleeving- provides durable thermal insulation for coolant hoses that require tight-radius routing, helping contain heat without restricting flexibility.
  • ARMATEX® Silicone and Fluorocarbon-coated fabrics- deliver flame retardancy and chemical resistance at manifold connections and joints, where mechanical stress and exposure risk are highest.
  • SILTEX® Silica Fabrics- offer high-temperature resistance and fire-blocking performance for ultra-high-density and high-power AI zones, enabling passive fire containment and avoiding consuming valuable rack or enclosure space.

Together, these materials ensure liquid-cooled racks can meet mechanical, thermal, and safety requirements without adding unnecessary complexity or volume. By combining insulation, chemical resistance, and passive fire protection at the component level, they provide durable, space-efficient protection inside increasingly dense rack environments.

Designing for Reliability, Safety, and Longevity

Wider use of liquid cooling places material performance at the centre of reliability and safety planning. Hoses, manifolds, and high-temperature zones represent areas where heat concentration and mechanical stress can affect long-term operation. Heat resistant fabrics manage such risks through passive thermal control and containment, reducing surface temperatures, and limiting the spread of heat or flame if a fault occurs. This added layer of protection supports consistent uptime and safe operation in high-density data centre environments.

Delivering Reliable Liquid Cooling Through Heat Resistant Fabrics

Liquid cooling performance depends on heat resistant fabrics that can manage radiant heat, protect adjacent equipment, and maintain integrity within dense, real-world rack layouts. HYTEX® sleeving, ARMATEX® coated fabrics, and SILTEX® silica textiles are heat resistant fabrics that provide targeted insulation, containment, and fire protection, enabling reliable operation as liquid cooling infrastructures scale within the data hall. Mid-Mountain Materials, Inc. works closely with operators and designers to apply these materials in the areas of the data centre where thermal, mechanical, and safety demands are highest. If you are planning or expanding a liquid cooling deployment, we invite you to work with our team to find a heat resistant material solution that can perform reliably in dense rack layouts and mixed cooling environments.