PG25 · 25% propylene glycol
PG25 denotes a nominal 25% propylene-glycol concentration; it is not a universal direct-to-chip default or a complete fluid specification. Name the product/base fluid, percentage basis, inhibitor package, water quality, materials compatibility, operating envelope, maintenance controls, and equipment warranty.
Current numbers
~170–235 L/minrack-level manifold flow for NVL72 (guide water-property heat-balance band for ~115 kW at 7–10 °C design rise; Clariant PG25 ~172–246 L/min at the same rise); CDU sized ~250–300 L/min at design pressure
~170–235 L/minsecondary-loop flow per GB200 NVL72 rack: guide water-property band ~170–235 L/min at 7–10 °C rise; Clariant PG25 ~172–246 L/min at the same rise; CDU sized ~250–300 L/min
~170–235 L/minsecondary-loop flow per GB200 NVL72 rack (guide water-property heat balance ~170–235 L/min at 7–10 °C rise across ~115 kW; Clariant PG25 ~172–246 L/min at the same rise); separate QCT rack-reference bounds are up to 45 °C liquid inlet / 65 °C liquid return; a 1.3 MW in-row CDU serves up to 8 racks (HPE)