Peroxide-cured EPDM expansion-tank bladders and seals for data center liquid cooling. Built to your tank, compatible with glycol coolants, made in the USA.
Data centers moving to direct liquid cooling run propylene-glycol coolant through coolant distribution units, cold plates and expansion tanks. The elastomer parts wetted by that coolant are no longer an afterthought: recent Open Compute Project guidance for 25 percent propylene glycol systems recommends against sulfur-cured butyl in wetted service, because residues from the cure system can contaminate the loop. Operators and OEMs now need peroxide-cured EPDM bladders and seals, built to the same dimensions as the parts they replace. That is custom elastomer engineering, and it is exactly what DRI does.
Bladders that separate coolant from the pressurizing gas in expansion and accumulator tanks, absorbing thermal volume change and holding loop pressure stable. Peroxide-cured EPDM compounded for glycol heat-transfer fluids, built to the tank geometry and fitting, for working pressures engineered to the loop, including 150 psi systems. See the inflatable bladder page for how DRI builds custom bladders.
Custom seals and gaskets for coolant distribution units, tank flanges, access covers and quick-service connections, in compounds selected for glycol compatibility and service temperature. Where equipment doors or chambers need a retractable seal, DRI's inflatable seal line applies the same materials engineering.
Every bladder is engineered to its tank and loop. The ranges below are the envelope DRI builds to; material and cure details are confirmed against the coolant specification during design.
| Expansion & Accumulator Bladders | Loop Seals & Gaskets | |
|---|---|---|
| Coolant | Propylene-glycol heat-transfer fluids, including PG25 | Glycol fluids, water, air |
| Material | Peroxide-cured EPDM | EPDM; silicone or FKM where temperature or chemistry requires |
| Service temperature | Typical liquid-cooling range, engineered to the loop (to +300°F for EPDM) | To +450°F (silicone) |
| Working pressure | Engineered to the system, including 150 psi loops | To suit flange and closure design |
| Configuration | Custom bladder geometry, fittings matched to tank hardware | Molded, extruded and spliced forms |
These programs usually start with one evaluation part and scale with the fleet. DRI works from a tank drawing, the coolant specification and the fitting hardware, supplies evaluation units for loop testing, and holds the profile and compound fixed for repeat production. Manufacturer representatives and system integrators are welcome; DRI supports the engineering conversation directly.
Recent Open Compute Project guidance for systems running 25 percent propylene glycol coolant recommends against sulfur-cured butyl in wetted applications, because cure-system residues can leach into the coolant loop. Peroxide-cured EPDM offers a cleaner cure chemistry with excellent compatibility with glycol-based heat-transfer fluids, which is why it is the compound DRI proposes for expansion-tank bladders in these systems.
As coolant heats and cools, its volume changes. The bladder separates the coolant from the pressurizing gas inside the expansion or accumulator tank, absorbing that volume change while keeping loop pressure stable and keeping gas out of the coolant. The bladder must tolerate constant flexing and full compatibility with the coolant chemistry.
Yes. DRI compounds peroxide-cured EPDM selected for service in propylene-glycol-based heat-transfer fluids, and builds bladders to the tank geometry, connection fitting and pressure of the system. Material and cure details are confirmed against the coolant specification during design.
Bladders are custom built to the tank, from small accumulator bladders to large expansion tanks, with working pressures engineered to the loop, including systems operating at 150 psi. Fittings and flange details are made to match the tank hardware.
Yes. Send the tank drawing, the old bladder, or its dimensions and fitting type. DRI builds a dimensional match in peroxide-cured EPDM so the tank hardware does not change.