Quick answer
PG25 coolant suppliers in our sourced profiles: BASF, Shell, Castrol, Dow, Ecolab, Dynalene, PFX Group, Arteco. Most sell a ready-to-use 25% propylene glycol fluid for sealed secondary loops, and several report NVIDIA DSX Ready qualification. Use the form below to request quotes.
Key takeaways
- PG25 = 25% propylene glycol plus inhibitors, ready to use.
- Qualification wording differs by supplier.
- Hardware and CDU vendor approval still applies.
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Supplier shortlist
| Supplier | Product(s) | Publicly reported qualification | HQ |
|---|---|---|---|
| BASF | GLYTHERMIN data-center platform (launched 8 Oct 2026): GLYTHERMIN DC PG25 (ready-to-use 25% PG, >99.5% PG purity, hybrid inhibitors, fluorescent dye, stated to exceed ASTM D8039), GLYTHERMIN DC OAT PG25, GLYTHERMIN PG OAT | GLYTHERMIN DC PG25 qualified as an NVIDIA DSX Ready coolant (secondary-loop, single-phase cold-plate) | Ludwigshafen, Germany |
| Shell | Shell DLC Fluid S3 (PG25, meets OCP PG25 specification, freeze protection −10 °C, green fluorescent dye, free of 2-EHA, borate and silicate); single-phase immersion cooling fluids | Shell DLC Fluid S3 reported as NVIDIA DSX Ready (Oct 2026); immersion fluids Intel Data Center Certified for Immersion Cooling (4th/5th Gen Xeon) | London, United Kingdom |
| Castrol | Castrol ON PG25 (OAT) and PG25T (IAT), pre-diluted direct-to-chip fluids | Castrol ON PG25 and PG25T announced as validated for NVIDIA AI infrastructure (18 Aug 2026); Castrol CORE Cooling Solutions named by NVIDIA among DSX Ready coolant partners (Oct 2026) | Pangbourne, United Kingdom |
| Dow | DOWFROST LC 25: ready-to-use inhibited 25% propylene glycol for sealed direct-to-chip loops, use up to 90 °C, freeze protection −10 °C, yellow dye | Dow has publicly stated DOWFROST LC qualified as NVIDIA DSX Ready | Midland, Michigan, USA |
| Ecolab | Propylene-glycol coolant for direct liquid cooling, with procurement, on-site filling, analysis and monitoring services. Product name: not published | Ecolab states its PG coolant is qualified NVIDIA DSX Ready | Saint Paul, Minnesota, USA |
| Dynalene | Dynalene PG-D25, a PG25 direct-to-chip fluid listed on the OCP Marketplace | Named by NVIDIA among DSX Ready coolant partners (Oct 2026); the specific qualified product is not published | 5250 West Coplay Road, Whitehall, Pennsylvania, USA |
| PFX Group (Solutherm) | SOLUTHERM OAT PG 25: ready-to-use 25% PG OAT fluid for secondary-loop direct-to-chip cooling | Listed on the OCP Marketplace; named among NVIDIA DSX Ready coolant partners | Not published |
| Arteco | ZITREC EC line (launched 29 Apr 2025): MPG-, MEG- and water-based OAT direct-to-chip coolants, free of nitrites, borates and 2-EHA | Arteco states ZITREC EC 20 is NVIDIA-qualified | Sint-Denijs-Westrem, Belgium (registered office: Schoten) |
Taken from our sourced supplier profiles (October 2026). Open a profile for the citations. "Not published" means we could not find a public source.
Related tool
Comparing data-center fluids?
Open comparator →What to ask a PG25 supplier
What to ask a PG25 supplier
- Which qualifications apply to the exact product: NVIDIA DSX Ready, OCP PG25 guideline, your CDU vendor's approval.
- Inhibitor type (OAT or IAT), dye and freeze point.
- Pack sizes (drums, IBC totes, bulk), lead time and regional stock.
- Fluid analysis or top-up services and recommended test intervals; see CDU coolant maintenance.
PG25 fluids compared
Direct-to-chip fluids side by side, restated from each supplier's published information (sources on the supplier profiles). "Not published" means we could not find it in the supplier's public material. Ask for the datasheet before you specify.
| Fluid | Base / inhibitors | Freeze protection | Dye | OCP / standards | NVIDIA status (as reported) |
|---|---|---|---|---|---|
| GLYTHERMIN DC PG25 BASF | Ready-to-use 25% PG (>99.5% PG purity), hybrid inhibitors | not published | Fluorescent | Stated to exceed ASTM D8039 | Qualified as NVIDIA DSX Ready |
| Shell DLC Fluid S3 Shell | PG25; free of 2-EHA, borate and silicate | −10 °C | Green fluorescent | Meets OCP PG25 specification | Reported as DSX Ready (Oct 2026) |
| DOWFROST LC 25 Dow | Ready-to-use inhibited 25% PG; use up to 90 °C | −10 °C | Yellow | not published | Dow states DSX Ready |
| Castrol ON PG25 Castrol | Pre-diluted PG25, OAT | not published | not published | not published | Validated for NVIDIA AI infrastructure (Aug 2026) |
| Castrol ON PG25T Castrol | Pre-diluted PG25, IAT | not published | not published | not published | Validated for NVIDIA AI infrastructure (Aug 2026) |
| HPC Heat Transfer Fluid PG25 / PG25 Advanced Valvoline (Beyond by Valvoline) | Organic acid technology in a PG base | not published | not published | not published | Brand named among DSX Ready partners; qualified product not published |
| Dynalene PG-D25 Dynalene | PG25 direct-to-chip fluid | not published | not published | Listed on OCP Marketplace | Named among DSX Ready partners; qualified product not published |
| SOLUTHERM OAT PG 25 PFX Group | Ready-to-use 25% PG, OAT | not published | not published | Listed on OCP Marketplace | Named among DSX Ready partners |
| PG coolant (name not published) Ecolab | Propylene glycol; with filling, analysis and monitoring services | not published | not published | not published | Ecolab states DSX Ready |
| ZITREC EC 20 (ZITREC EC line) Arteco | MPG-based OAT (line also has MEG- and water-based); free of nitrites, borates and 2-EHA | not published | not published | not published | Arteco states NVIDIA-qualified |
Checked against supplier material in October–November 2026. Qualification status changes; confirm with the CDU and server makers for your deployment. Compare in detail with the DC coolant comparator, or get the free fluid RFQ checklist.
Compare before you buy
Compare PG25 with other fluids in the data-center coolant comparator, read what is PG25?, and check the NVIDIA DSX Ready list. Immersion instead? See immersion cooling fluid suppliers.
Frequently asked questions
Free: liquid-cooling fluid RFQ checklist
Two pages: what to specify, documents to demand, and a grid to compare three supplier quotes.
Get the checklist →Frequently asked questions
Is PG25 sold ready to use?
The PG25 products in our profiles are sold pre-diluted, ready to use. Check each supplier's datasheet.
Does Coolant.com sell coolant?
No. We pass your request to suppliers, who quote you directly. Suppliers may pay us for introductions.
How we source this page
- Facts come from manufacturer pages, datasheets, owner's manuals and standards bodies, linked under Sources.
- We do not test products, and no brand pays to be listed or ranked. Advertising and affiliate links are labelled and never change the data.
- Anything we could not find is marked "not published" rather than guessed. Spotted an error? Tell us.
Sources
Sources
- BASF: Ludwigshafen site (headquarters)
- BASF news release, Oct 2026
- BASF GLYSANTIN/GLYTHERMIN: data center
- UK Companies House: Shell plc registered office
- Data Centre Magazine: NVIDIA qualifies Shell DLC fluid
- Intel: Shell customer story
- Castrol newsroom
- Dow: contact (headquarters)
- Dow: DOWFROST LC 25 product page
- Ecolab: global headquarters
- Ecolab: coolants for direct liquid cooling
- Dynalene: contact
- Solutherm: OAT PG heat-transfer fluid
- OCP Marketplace listing
- Arteco: offices
- Arteco: our legacy
- Arteco: ZITREC EC launch
- Arteco: ZITREC EC product page
- NVIDIA: DSX Ready program page (coolant category)