Liquid Cooling Vendors

Castrol

Castrol ON sells single-phase dielectric immersion coolants (DC 15 and DC 20) and a ready-to-use PG25 coolant for direct-to-chip loops, co-engineered with immersion partners Submer and Iceotope.

Fluids, Immersion, single-phase Checked

Rating conditions

PG 25 ships pre-mixed and biostable, with no dilution needed.

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Datasheet

Source on every value
Technologies Liquid cooling product types the vendor sells today. 'Liquid-to-air CDU' is a sidecar unit or heat dissipation unit that needs no facility water. 'Two-phase cold plate' boils a refrigerant or dielectric on the chip.
Fluids, Immersion, single-phase 1
Smallest CDU kW Rated cooling capacity of the smallest shipping CDU in the line, as the vendor publishes it. Rating conditions (approach temperature, fluid) are in the spec notes. Blank when not published.
Not published
Largest CDU kW Rated cooling capacity of the largest shipping CDU, as the vendor publishes it. Prototypes and announced-only units are left out and named in the spec notes. Blank when not published.
Not published
GPU platforms (vendor-stated) GPU or rack platforms the vendor itself names as supported, certified or targeted, such as NVIDIA GB200 NVL72 or Vera Rubin. Vendor statements only, each with a source. Blank when the vendor names none.
Not published
Level Where the products sit: in the server, in the rack, in the row, or at facility scale (skid or facility distribution unit).
Not published
Coolant Coolant on the IT side: water-glycol (PG25 and similar), single-phase dielectric (oils, GTL, synthetic hydrocarbons) or two-phase dielectric or refrigerant.
Water-glycol, Dielectric, 1-phase 2
Max per rack kW Highest rack density the vendor publishes for its own system (immersion tank, in-rack CDU, rear door or OEM rack). Filled only when the vendor states a per-rack figure.
Not published
Rear door max kW Highest published heat removal of the vendor's rear-door heat exchanger, per rack.
Not published
Vendor type Liquid cooling specialist, thermal and HVAC major, power and data center infrastructure major, server OEM, component maker (cold plates, connectors, CDUs sold to OEMs) or fluid supplier.
Fluid supplier 1
Parent company Owner or controlling shareholder when the vendor sits inside a larger group, such as CoolIT under Ecolab or Motivair under Schneider Electric.
Not published
HQ region Region of the vendor's (or brand owner's) headquarters.
Not published
HQ country Country of the vendor's (or brand owner's) headquarters.
Not published
Headquarters Headquarters city and country as the vendor states it.
Not published
Manufacturing Regions or sites where the vendor says it builds liquid cooling products. Blank when not published.
Not published
Key products Main product lines and model names for data center liquid cooling.
Castrol ON DC 15, Castrol ON DC 20, Castrol ON Direct Liquid Cooling PG 25 2
Spec notes Rating conditions behind the numbers (approach temperature, water temperature, fluid), conflicting figures, and prototypes left out of the ranges.
PG 25 ships pre-mixed and biostable, with no dilution needed. 1

Sources

4
  1. Data centre and IT cooling | Castrol accessed 2026-11-09
  2. Immersion cooling fluids | Castrol accessed 2026-11-09
  3. Direct liquid cooling fluids | Castrol accessed 2026-11-09
  4. Partner with us: data centre and IT cooling | Castrol accessed 2026-11-09

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