Best Hose Materials for Direct Liquid Cooling (DLC) Systems

a combination of:

• Excellent flexibility
• Good water resistance
• Strong glycol compatibility
• Good aging performance
• Cost-effective lifecycle value

These characteristics make EPDM suitable for many AI data center cooling loops.

Typical EPDM Applications

EPDM cooling hoses are commonly used in:

• AI server liquid cooling
• GPU cooling systems
• CDU connections
• HPC facilities
• Industrial thermal management

Advantages of EPDM Cooling Hose

1. Good Coolant Compatibility

EPDM performs well with many water-based coolants, including glycol mixtures.

2. Excellent Flexibility

This helps engineers route hoses through dense server environments.

3. Long-Term Stability

EPDM maintains mechanical properties during continuous operation.

Considerations

EPDM may not be suitable for every chemical environment.

For applications involving aggressive chemicals or high-purity requirements, alternative materials may be preferred.

Silicone Hose for Liquid Cooling Applications

Advantages of Silicone

Silicone rubber is known for:

• Excellent temperature resistance
• High flexibility
• Soft material characteristics

It is often selected when installation flexibility is a major concern.

Typical Applications

Silicone hoses are commonly considered for:

• Equipment cooling
• Laboratory systems
• Medical equipment
• Specialized thermal applications

Limitations

Compared with EPDM, silicone may have different characteristics regarding:

• Mechanical strength
• Permeation resistance
• Certain coolant compatibility requirements

Therefore, application testing is recommended before large-scale deployment.

PTFE and Fluoropolymer Hoses

Why Consider PTFE?

PTFE (Polytetrafluoroethylene) offers outstanding chemical resistance.

Advantages include:

• Excellent chemical stability
• Wide temperature range
• Low contamination characteristics
• Non-stick surface properties

Typical Applications

PTFE and fluoropolymer hoses are often used in:

• Semiconductor equipment
• Chemical processing
• High-purity systems
• Specialized cooling environments

Limitations

Compared with rubber hoses:

• Lower flexibility
• Higher material cost
• Different mechanical characteristics

For standard AI data center cooling loops, EPDM is often a more practical choice, while PTFE solutions are valuable for demanding environments.

EPDM vs Silicone vs PTFE Comparison

How to Select the Right Material for AI Data Center Cooling

When selecting a hose material for DLC systems, engineers should evaluate:

1. Cooling Medium

Confirm compatibility with:

• DI water
• Propylene glycol
• Ethylene glycol
• Specialty coolant

2. Operating Temperature

Consider:

• Normal operating temperature
• Maximum temperature
• Thermal cycling frequency

3. Installation Requirements

Evaluate:

• Space limitations
• Bend radius
• Connection layout

4. Reliability Requirements

For AI infrastructure, consider:

• Continuous operation
• Maintenance accessibility
• Replacement difficulty

Why Material Selection Is Critical for AI Infrastructure

A failed cooling hose may cause:

• Cooling interruption
• Equipment maintenance
• Production downtime
• Increased operating costs

The cost of a hose failure is usually much higher than the cost difference between materials.

Therefore, material selection should focus on:

Total system reliability rather than initial purchase price.

CJAN Liquid Cooling Hose Material Solutions

CJAN develops liquid cooling hose solutions based on different application requirements.

LCH Series

Designed for:

• AI data center cooling
• Industrial liquid cooling
• General thermal management

Features:

• Flexible construction
• Reliable coolant transportation
• Suitable for cooling loop applications

LCH-SD Series

Designed for applications requiring enhanced safety considerations.

Suitable for:

• Data centers
• High-density computing environments
• Mission-critical cooling systems

LCH-SDS Series

Designed for applications requiring:

• Higher flexibility
• Complex routing
• Space-limited installations

Conclusion

Material selection is one of the most important decisions when designing a direct liquid cooling system.

EPDM, silicone, and PTFE each provide different advantages:

• EPDM: balanced performance for AI data center cooling
• Silicone: excellent flexibility and temperature capability
• PTFE: superior chemical resistance for demanding environments

For AI infrastructure, the best hose material is not determined by one specification alone. It requires a complete evaluation of coolant type, operating conditions, installation requirements, and long-term reliability expectations.

As liquid cooling adoption continues to grow, selecting the right hose material will become an increasingly important part of building reliable thermal management systems.