What to Check Before Selecting Data Centre Liquid Cooling Fluids Malaysia

What to Check Before Selecting Data Centre Liquid Cooling Fluids Malaysia

Content

Liquid cooling is increasingly considered for high-density data centres because it can transfer heat more directly than conventional room-level air cooling.

However, selecting a liquid-cooling fluid is not simply a matter of choosing the product with the lowest advertised operating temperature or highest thermal conductivity.

The fluid must be compatible with the cooling architecture, pumps, seals, tubing, cold plates, electrical equipment, maintenance procedures and environmental requirements.

Before purchasing or filling a system in Malaysia, data-centre owners and contractors should review the fluid specification, safety documentation and complete operating requirements.

First Identify the Cooling Architecture

Different cooling systems require different fluids.

Direct-to-Chip Cooling

Coolant circulates through cold plates attached to processors or other high-heat components.

The liquid is normally kept inside a closed loop and does not directly contact live electronic components.

Important requirements include:

Heat-transfer performance

Material compatibility

Corrosion control

Pump suitability

Fluid cleanliness

Leak detection

Maintenance access

Immersion Cooling

Servers or components are immersed in a dielectric liquid.

The fluid must provide:

Electrical insulation

Suitable thermal properties

Chemical stability

Material compatibility

Acceptable viscosity

Controlled moisture content

Safe handling and maintenance

Single-phase and two-phase immersion systems use different operating principles and may require different fluids.

Facility Water Loop

A facility water system transfers heat between the data hall and external cooling equipment.

This loop may use:

Treated water

Water-glycol mixture

Other engineered heat-transfer fluids

The facility loop and the technology-cooling loop should not automatically be assumed to use the same fluid.

1. Confirm Whether the Fluid Must Be Dielectric

A dielectric fluid resists electrical conduction and may be required when the liquid can contact electronic components.

For direct-to-chip systems, the coolant inside the cold plate is not always required to be a dielectric fluid because it is physically separated from electronics.

For immersion cooling, dielectric performance is essential.

Ask the supplier:

Is the fluid electrically insulating?

What is its dielectric strength?

How does moisture contamination affect it?

Does the dielectric performance change with age?

What testing is required during service?

Do not assume that every product marketed as a data-centre coolant is suitable for immersion.

2. Review Thermal Performance

Important thermal properties include:

Specific heat capacity

Thermal conductivity

Viscosity

Density

Boiling point

Freezing point

Operating-temperature range

A fluid with good heat-transfer performance may allow:

Higher heat removal

Lower flow requirements

Reduced pumping demand

Smaller cooling components

However, thermal performance must be assessed together with viscosity, pump efficiency and system design.

One impressive specification does not determine total system performance.

3. Check Viscosity at Actual Operating Temperature

Viscosity affects how easily the fluid moves through:

Pumps

Cold plates

Tubing

Valves

Filters

Heat exchangers

A fluid that becomes too viscous at lower temperature may increase:

Pumping energy

Pressure drop

Startup difficulty

Flow imbalance

Component stress

Review the viscosity curve across the expected Malaysian operating range rather than relying on one value measured under ideal laboratory conditions.

4. Confirm Material Compatibility

The coolant may contact:

Copper

Aluminium

Stainless steel

Nickel

Brass

Plastics

Rubber

Elastomers

Gaskets

Sealants

Flexible hoses

Cable insulation

An incompatible fluid can cause:

Corrosion

Swelling

Hardening

Cracking

Seal failure

Leaks

Deposits

Cold-plate blockage

Request compatibility information for the actual materials used in the system.

A coolant approved for one manufacturer’s design may not be automatically suitable for another system.

5. Evaluate Corrosion Protection

Water-based coolants may require corrosion inhibitors.

Questions to ask include:

Which metals are protected?

How long does the inhibitor remain effective?

How is inhibitor concentration checked?

Can different metals create galvanic-corrosion risk?

What happens if the fluid is diluted?

What is the recommended replacement interval?

Corrosion risk may increase when oxygen, contaminants or incompatible top-up water enter the loop.

6. Check Water Quality Requirements

Where water or a water-based mixture is used, the supplier may specify limits for:

Conductivity

pH

Hardness

Chloride

Sulphate

Dissolved solids

Microbiological activity

Suspended particles

Dissolved oxygen

Ordinary tap water should not be added unless the system supplier specifically permits it.

Incorrect top-up water may introduce:

Scale

Corrosion

Biological growth

Increased conductivity

Blockage

Reduced heat-transfer performance

The filling and top-up procedure should identify the approved water quality.

7. Review Electrical Conductivity

Conductivity is particularly important for water-based cooling loops and systems located close to sensitive electronics.

Ask:

What is the conductivity of new fluid?

What operating range is acceptable?

How quickly does conductivity change during use?

Does the system require deionisation or filtration?

What action is required when conductivity rises?

For immersion fluids, dielectric strength and moisture contamination may be more relevant than conventional water conductivity alone.

8. Consider Microbiological Growth

Water-based cooling systems may support microbial growth if they are not properly designed and maintained.

Possible consequences include:

Biofilm

Flow restriction

Reduced heat transfer

Filter blockage

Microbiologically influenced corrosion

Odour

Increased maintenance

The fluid-management plan may require:

Biocide

Filtration

Temperature control

Closed-loop design

Scheduled sampling

Fluid replacement

Biocide selection must be compatible with system materials and operating requirements.

9. Check Fluid Cleanliness and Filtration

Particles can block narrow channels inside cold plates and heat exchangers.

Review:

Maximum permitted particle size

Required filter rating

Filter-change interval

Filling and flushing procedure

Cleanliness of new piping

Sampling method

Response to contamination

The cooling loop should normally be cleaned and flushed according to the equipment supplier’s instructions before final filling.

10. Understand Fire and Flash-Point Properties

Different liquids have different flammability characteristics.

Review the Safety Data Sheet for:

Flash point

Fire classification

Auto-ignition information

Recommended extinguishing method

Storage requirements

Ventilation

Spill-control procedure

A fluid described as having a high flash point is not automatically non-flammable.

The facility’s fire-safety strategy should reflect the actual coolant volume and installation method.

11. Review Health and Exposure Information

Operators and service personnel may contact the fluid during:

Filling

Draining

Filter replacement

Leak repair

Server removal

Fluid sampling

Spill cleanup

The Safety Data Sheet should explain:

Required personal protective equipment

Skin and eye exposure response

Vapour or mist precautions

Ventilation requirements

First-aid measures

Storage

Disposal

These requirements should be included in staff and contractor training.

12. Ask Whether the Fluid Contains PFAS

Some fluorinated dielectric fluids may contain substances classified within the broad PFAS family.

This does not mean that every liquid-cooling fluid contains PFAS or that every product has the same risk profile.

Before purchase, ask the supplier to confirm:

Full chemical classification

Whether the fluid contains intentionally added PFAS

Applicable Safety Data Sheet information

Environmental persistence

Spill and disposal procedure

Recovery or recycling programme

Current and expected regulatory restrictions

Availability of non-PFAS alternatives

Marketing terms such as “environmentally friendly” should be supported by specific documentation.

13. Evaluate Environmental Impact

Review more than the cooling system’s immediate energy efficiency.

Consider:

Global-warming potential

Environmental persistence

Toxicity

Water contamination risk

Fluid loss during maintenance

Recovery and recycling

End-of-life disposal

Packaging and transport

Local waste-management capability

A fluid may improve cooling efficiency while creating additional environmental or disposal obligations.

14. Confirm Fluid Life and Replacement Requirements

Ask the supplier:

What is the expected service life?

Which properties should be tested?

How frequently should samples be taken?

What are the rejection limits?

Can the fluid be filtered or reconditioned?

Can different production batches be mixed?

Can fresh fluid be used for topping up?

Who accepts the used fluid?

Replacement cost can become significant in a system containing a large volume of specialist coolant.

15. Check Warranty Conditions

Server, cooling-equipment and fluid warranties may depend on using an approved product.

Confirm:

Approved coolant list

Required concentration

Sampling interval

Maintenance records

Filter requirements

Prohibited mixing

Fluid-analysis requirements

Responsibility for leak-related damage

Using an unapproved alternative may reduce the initial cost while creating a larger warranty risk.

16. Review Local Availability

A technically suitable fluid may still create operational risk if replacement stock is unavailable in Malaysia.

Consider:

Local inventory

Lead time

Minimum order quantity

Emergency top-up supply

Shelf life

Packaging size

Transport restrictions

Technical support

Waste collection

The site should maintain an appropriate emergency quantity without overstocking a fluid that may expire or become obsolete.

17. Define the Monitoring Plan

A liquid-cooling system may require regular checks of:

Supply and return temperature

Temperature difference

Flow rate

Pressure

Differential pressure

Conductivity

pH

Fluid level

Leak status

Filter condition

Pump vibration

Pump current

Heat-exchanger performance

The exact parameters depend on the cooling architecture and coolant chemistry.

18. Establish a Leak-Response Procedure

Before filling the system, define:

How leaks are detected

Who receives the alarm

How equipment is isolated

Whether the server must be shut down

What PPE is required

How fluid is contained

How contaminated materials are handled

How the cooling loop is refilled and tested

When the system may return to operation

The procedure should distinguish between water-based and dielectric-fluid incidents.

Questions to Ask the Supplier

Before placing an order, obtain written answers to:

Which cooling architecture is the fluid approved for?

Is it dielectric?

What materials are compatible?

What temperature and viscosity range applies?

What conductivity or water-quality limits apply?

Does it contain intentionally added PFAS?

What are the fire and exposure precautions?

What tests are required during operation?

What is the expected service life?

Can the fluid be recycled or recovered?

What local stock and technical support are available?

Will its use maintain the equipment warranty?

Instruments for Cooling-System Inspection

Data-centre cooling assessment may involve:

Thermal imaging

Contact temperature measurement

Temperature and humidity logging

Differential-pressure measurement

Airflow testing

Electrical current measurement

Water conductivity and pH checks

Leak detection

Pump vibration checks

Network and control-system testing

No single instrument can evaluate the entire cooling system.

Data Centre Testing Instruments from MTM Precision

MTM Precision supplies instruments for data-centre inspection, cooling assessment and facility maintenance in Malaysia.

Relevant product categories include:

NOYAFA NF-522 thermal imaging camera

Temperature and humidity meters

Temperature and humidity data loggers

Differential-pressure meters

Airflow and anemometer instruments

Clamp meters and electrical testers

Water-quality meters

Leak-detection equipment

Vibration meters for pumps and cooling equipment

Network and cable testers

For liquid-cooling applications, the required measurements should be defined according to the coolant, cooling architecture and equipment manufacturer’s requirements.

Contact MTM Precision

MTM Precision Sdn. Bhd. (744811-A)

Tel: 03-8080 7172

WhatsApp: +6016-660 7346

Email: mtmpre@yahoo.com / enquiry@mtmpre.com.my

Website: www.mtmpre.com.my

Visit our Puchong Showroom & Service Centre for data-centre testing instrument selection, demonstration and technical support.

Operating hours: Monday to Friday, 9:00 AM–6:00 PM.