A high-temperature fluid-rated ultra-high-pressure hose assembly line for metallurgy continuous casting, forging presses, die-casting machines, asphalt paving and geothermal duty — where media temperature stays high for long periods. It answers a question many equipment selections overlook: when a hose is rated −40 ℃ to +100 ℃, how long does it actually last against sustained 130 ℃ return oil?
What High Temperature Actually Consumes in a Hose
Heat doesn't "burn" a hose — it accelerates depreciation. As a rule of thumb, every ~10 ℃ rise roughly doubles the rate of rubber thermo-oxidative aging, so aging at 120 ℃ runs about 16 times faster than at 80 ℃. It manifests in three failure layers:
Inner tube softening: heat raises the effective glass transition and lowers elasticity, drifting the crimp interference and raising leak risk at the fitting.
Reinforcement creep: wire strength and modulus drop at elevated media temperature, compressing impulse fatigue life.
Cover thermo-oxidative degradation: the cover hardens and cracks under heat and oxygen, losing protection of the reinforcement so moisture and corrosion get in.
The subtler part is the fluid itself: heat accelerates oil oxidation, generating sludge and acidic byproducts that in turn attack the inner tube and seals — heat and fluid degradation amplify each other in a loop.
Four Layers of Heat-Resistance Technology
① Graded-temperature liner. HNBR or FKM liner by temperature class: HNBR runs continuously around +150 ℃; FKM reaches about +200 ℃ continuous and +220 ℃ transient, covering casting and forging extremes.
② Heat-treated reinforcement. Spiral layers use heat-resistant surface treatment and optimized layout to hold structural strength and fatigue life at temperature, avoiding "passes at ambient, ages early hot."
③ Thermo-oxidative-resistant cover. Cover compound resists temperature, ozone and sludge adhesion, slowing oxidative cracking and extending the protection window over the reinforcement.
④ Measured high-temperature impulse life. Assemblies are impulse-tested at +120 ℃ or +150 ℃ media rather than substituting an ambient report, so "high-temperature life" is a measured figure.
Key Specifications (Indicative)
Model | Nominal Bore | Rated Pressure | Continuous Temp | Transient Temp | Min. Burst | Hot Impulse Life |
HN150-10 | DN10 | 45 MPa | +150 ℃ | +175 ℃ | ≥180 MPa | ≥400k @120 ℃ |
HN150-16 | DN16 | 35 MPa | +150 ℃ | +175 ℃ | ≥140 MPa | ≥400k @120 ℃ |
FK200-19 | DN19 | 42 MPa | +200 ℃ | +220 ℃ | ≥168 MPa | ≥400k @150 ℃ |
FK200-25 | DN25 | 35 MPa | +200 ℃ | +220 ℃ | ≥140 MPa | ≥400k @150 ℃ |
Note: Indicative values for typical sizes. Actual temperature classes, burst pressure and hot-impulse conditions are subject to the formal catalog and factory test reports.
Typical Applications
Continuous casting mold and secondary cooling hydraulics, forging and die-forging presses, die-casting high-pressure circuits, asphalt mixing and paving equipment, geothermal and high-temperature process lines, glass forming machinery.