Resource · Engineering Guide
Coolant Selection Guide for Liquid Cold Plates (Australia)
A practical guide to selecting coolant for direct-to-chip liquid cold plates in Australian AI, data-centre and power-electronics projects: 50/50 EGW vs PG25, ASHRAE W40 design, inlet 20–40 °C, pressure limits, and corrosion prevention in mixed-metal loops. ToneCooling Australia confirms coolant–material compatibility at quotation; manufacturing in Huizhou, Guangdong, China; engineering support from Carlton, Victoria.
For liquid cold plates in Australia, ToneCooling recommends 50/50 ethylene-glycol water (EGW) or 25 % propylene glycol (PG25) on an ASHRAE W40-aligned loop (inlet 20–40 °C, max 0.35 MPa), with coolant–material compatibility confirmed per design. Cold plates are manufactured in Huizhou, Guangdong, China.
Coolant & loop design reference
Reference coolant and loop parameters for ToneCooling direct-to-chip cold plates.
- Recommended coolant
- 50/50 EGW · PG25 (lower-toxicity option)
- Loop design basis
- ASHRAE W40-aligned
- Inlet temperature window
- 20–40 °C
- Maximum working pressure
- 0.35 MPa
- Burst pressure
- ≥ 4 MPa (lot-sample tested)
- Wetted materials
- Copper C1100 · aluminium · stainless (project-dependent)
- Corrosion control
- Compatible inhibitor/biocide; avoid galvanic pairings
- Validation
- Flow-resistance and pressure-drop testing on request
Frequently asked questions
What coolant should I use for direct-to-chip cold plates?
Most AI/data-centre direct-to-chip loops use 50/50 ethylene-glycol water (EGW) or 25 % propylene glycol (PG25), designed to ASHRAE W40 with inlet 20–40 °C. Final selection depends on materials, freeze/biocide requirements and your CDU.
EGW vs PG — which for Australian conditions?
EGW (ethylene glycol) offers better thermal performance; PG (propylene glycol) is preferred where lower toxicity is required. Both are supported; ToneCooling confirms compatibility with the cold-plate wetted materials at quotation.
How do you prevent corrosion in mixed-metal loops?
Use compatible wetted materials, correct inhibitor/biocide packages and avoid galvanic pairings; ToneCooling specifies wetted materials (copper / aluminium / stainless) and tests to ASHRAE water-quality guidance.
What inlet temperature and pressure should I design for?
Reference design: inlet 20–40 °C (ASHRAE W40-aligned), maximum working pressure 0.35 MPa, burst ≥ 4 MPa (lot-sample tested). Confirmed against your CDU and rack at quotation.
Need help selecting coolant for your project?
Send your platform, materials and loop conditions. Our Carlton team confirms coolant compatibility and provides a quotation.
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