Quick answer
Filter data-center coolants by NVIDIA qualification, PG25 or dielectric/immersion. Each row links to a sourced supplier profile. Prices aren't published. Qualifications reflect public statements as of October 2026, so confirm with the supplier and your hardware vendor.
Key takeaways
- All data comes from cited public sources.
- "Not published" means unverified.
- Hardware approval comes before any qualification.
- Most direct-to-chip options are PG25.
- Immersion fluids are a separate category.
How to use the comparator
- Choose a filter.
- Open a supplier profile for its sources.
- Shortlist, then ask the suppliers the questions on each profile.
Background
- What is PG25?
- Direct-to-chip vs immersion
- NVIDIA DSX Ready coolants
- CDU coolant maintenance
- Coolant suppliers directory
What the columns mean
| Column | Meaning |
|---|---|
| Supplier | Company named in the cited public source |
| Product | Product family or name as published |
| Base | Glycol/water (e.g. PG25) or dielectric |
| Reported qualification | Public claims such as NVIDIA DSX Ready, NVIDIA-validated or OCP listing |
| Price | Not published |
Questions to send each shortlisted supplier
- Which OCP PG25 document and version does the fluid meet?
- Which cold-plate and CDU vendors approve it?
- What are the pH, conductivity, glycol % and inhibitor reserve limits?
- What sampling program and lab turnaround do you offer?
- What packaging, lead times and regional stock?
- What's the top-up and end-of-life disposal guidance?
How to read qualification claims
A qualification shows the fluid passed a specific program's tests. It isn't a hardware approval. Castrol, for example, describes its NVIDIA validation review as covering corrosion resistance, thermal stability, water quality, PG purity, wetted-material compatibility and supply-chain resilience.
Background reading
- What is PG25?
- Direct-to-chip vs immersion
- CDU coolant maintenance
- NVIDIA DSX Ready coolants
- Coolant suppliers directory
- Data-center liquid cooling hub
Limitations
- Only public, citable claims are included
- Absence from the table doesn't mean a product isn't qualified
- Specs and qualifications change, so check the date in each profile
Typical evaluation workflow
- Filter to PG25 or dielectric, depending on your architecture.
- Open each profile and read the cited sources.
- Check your hardware vendor's approved fluid list.
- Request datasheets, SDS and maintenance limits.
- Score the suppliers on approvals, service, supply and documentation.
- Pilot, then standardize on one fluid per loop.
Why we don't show prices
Data-center fluid pricing depends on volume, packaging, services and region, and suppliers rarely publish it. Showing estimates would be guesswork, so the column reads "not published".
Single-phase vs two-phase in the table
Rows marked dielectric are immersion fluids. Single-phase fluids (Submer SmartCoolant, Engineered Fluids ElectroCool, Shell immersion fluids, Valvoline DE1) stay liquid. Chemours Opteon 2P50 is a developmental two-phase fluid designed to boil and condense. These aren't interchangeable with PG25 and require purpose-built tanks or systems.
Keeping your shortlist current
Supplier announcements arrive often. Re-check profiles before any procurement decision and ask suppliers for their latest qualification letters.
See who makes data-center and car coolants
Browse suppliers →How we pick what to include
A product appears if a supplier page or reputable trade publication describes it as a data-center coolant, with enough detail to classify its base fluid. Qualification claims are quoted as published. Where a supplier's qualified product isn't named publicly, the table says so.
Reading supplier wording carefully
| Wording | What it usually means |
|---|---|
| "Qualified" / "DSX Ready" | Passed a specific vendor program |
| "Validated" | Reviewed or tested by the named party; scope varies |
| "Meets OCP PG25 specification" | Claims conformance to an OCP document; ask which version |
| "Listed on OCP Marketplace" | Product listed by the supplier on OCP's marketplace |
Pairing the comparator with ASHRAE and OCP guidance
Use the comparator to shortlist, ASHRAE TC9.9 guidance for loop design and water quality, and the OCP PG25 guidelines for materials, cleaning, filtration and monitoring. Our CDU maintenance and PG25 pages summarize both.
PG25 or dielectric: first decision
If your servers use cold plates, you're choosing among glycol-water fluids such as PG25. If you're deploying immersion tanks, you're choosing dielectrics, single- or two-phase. Filter accordingly.
More questions answered
Can I export the table?
Not yet. Each row links to a profile with sources you can cite in your own evaluation.
Why isn't my supplier listed?
We include products only when we can cite a public source. Send one via the contact page and we'll review it.
Does the comparator rank suppliers?
No. It filters and lists. Ranking would need testing data we don't have.
Are immersion fluids compared on the same basis as PG25?
No. They're a different category. Filter by dielectric to see them separately.
How often is it updated?
When we verify new public information. Profiles show the check date.
Is pricing ever shown?
Only if a supplier publishes it. Otherwise the column reads "not published".
Can I use this for procurement?
Use it to shortlist, then verify the approvals, datasheets and limits directly with suppliers and your hardware vendors.
Reader questions
What's the difference between PG25 OAT and PG25 IAT products?
Both are 25% propylene glycol fluids. They differ in inhibitor chemistry: organic acid vs inorganic. Castrol, for example, offers both (ON PG25 and PG25T). Your hardware vendor's approval decides which is acceptable.
Why do some fluids advertise being free of 2-EHA, borate or silicate?
Suppliers exclude certain additives for compatibility, regulatory or stability reasons. Shell and Arteco both publish such exclusions. Ask suppliers why their exclusions matter for your materials.
Should I standardize on one fluid across sites?
Many operators prefer one approved fluid per loop type to simplify spares, sampling and training, as long as it's approved for every hardware platform involved.
What about rear-door heat exchangers?
They usually run on facility or secondary water loops with their own guidance. This comparator focuses on direct-to-chip and immersion fluids.
Key point to remember
Treat the comparator as the first filter in a longer evaluation. After you shortlist fluids, the decisive inputs come from your hardware vendors' approved lists, the supplier's datasheet and SDS, and a maintenance program that fits your operations team. Ask each supplier for references from operators running similar hardware, and agree on sampling frequency and laboratory turnaround before commissioning. Documenting those decisions alongside this comparison creates an audit trail that helps with warranty discussions, internal sign-off and future capacity expansions.
In practice
In practice, save your filter view and notes.
Next step
Contact shortlisted suppliers.
One more tip
Bookmark profiles you shortlist. They're updated when we verify new public information.
Frequently asked questions
Where does the comparator data come from?
Supplier pages and trade press, cited on each profile.