Data center EPDM hose, specified row by row
Fibre-braided, peroxide-cured tube with a UL 94 V-0 cover.
200 psi / 1.38 MPa
145 psi on the −8 and −10 dash
−40 °C to +99 °C
+120 °C on the jumper
UL 94 V-0
Cover compound
The ratings are the entry ticket. Published as the rating the product is built to; no approval document is held.
Peroxide cure against sulphur cure
| Row | Peroxide tube, supplier-declared | Sulphur-cured rubber |
|---|---|---|
| Crosslink | no sulphur residues | sulphur and accelerator residues |
| Glycol | zero precipitation, zero swelling | precipitates into the coolant |
| Path | none | cold-plate micro-channels |
| Test | ISO 1817 immersion | ISO 1817 immersion |
EPDM is non-polar: good in water and glycol, poor in oils.
Immersion is the test that settles it
168 h at 70 °C in PG50, swell and mass change reported. No ISO 1817 swell limit is published for a data-center hose.
Construction classes and the negative-pressure problem
| Class | Build | Duty |
|---|---|---|
| Unreinforced | EPDM tube, textile cover | drain and vent |
| Single-layer braid | one synthetic fibre layer | cold-plate jumpers |
| Composite | two braid layers or a helix | grid mains |
| Wire braid | steel wire | industrial pressure |
Negative pressure during start-stop collapses ordinary braided hose; composite prevents it.
Jumper sizes, dash −4 to −10
| Dash | ID mm | OD mm | Working MPa | Min burst, ratio | Bend radius mm |
|---|---|---|---|---|---|
| −4 | 6.1-7.2 | 11.6-12.6 | 1.38 | 5.5, 4.0x | 24.5 |
| −5 | 7.7-8.3 | 14.5-15.5 | 1.38 | 5.5, 4.0x | 31.5 |
| −6 | 9.5-10.3 | 15.4-16.4 | 1.38 | 5.5, 4.0x | 37 |
| −8 | 12.5-13.3 | 19.7-20.7 | 1.00 | 3x floor | 69 |
| −10 | 15.8-16.6 | 22.5-23.7 | 1.00 | 3x floor | on drawing |
No source figure: the 3x floor. Every code ships a 1.5x proof.
Grid bores, where bend radius is the design constraint
| Dash | Bore | ID mm | Working | Min burst, ratio | Bend radius mm |
|---|---|---|---|---|---|
| −16 | 1 in | 25.4 | 200 psi | 3x floor | 127.0 |
| −24 | 1.5 in | 38.1 | 200 psi | 3x floor | 203.2 |
| −32 | 2 in | 50.8 | 200 psi | 3x floor | 304.8 |
A 24.5 mm hose in a 20 mm bend kinks its braid.
Temperature limits, and the unit trap
| Grid construction | −40 to +99 °C |
|---|---|
| Jumper compound | −40 to +120 °C |
| Flame scope | cover compound only |
| Coolant at a coupling | 60 to 80 °C |
| Unit trap | the sheet prints −40 °F beside −40 °C; 99 °C is 210 °F |
How to specify the compound without a brand
One callout carries hardness, tensile, heat ageing, fluid resistance.
EPDM 70 is the standard 70 Shore A compound; tube and cover run 60 to 80.
Tensile ASTM D412, heat ageing ASTM D573, ozone ASTM D1149-18(2025). No D2000 callout is published; state the one you need and it is confirmed against the order.
Coil length, storage and shelf life
Order lengths: 20 m, 50 m or 100 m; length is an order configuration, confirmed on the order drawing.
Bag it, away from sunlight, motors and welding equipment: ozone attacks seals. Shelf life, 3 years minimum.
