HYDAC high-temp replacement filters – three grades, up to 140°C.

1. High-Temperature Hazard Characteristics & Core Definition

Aite High-Temperature Resistant Replacement HYDAC Filters are engineered 

for steel production lines including hot rolling mills, continuous casting machines,

 blast furnace hydraulic stations, and heating furnace auxiliary equipment.

 These environments generate severe high-temperature hydraulic oil operating 

conditions – with long-term continuous oil temperature ranging from 90°C to 

120°C, accompanied by instantaneous thermal peak surges of 130–150°C caused 

by furnace radiation, rolling load sudden increase, and insufficient oil cooling

 circulation. The hydraulic medium also contains high-temperature oxidized oil

 sludge, iron oxide abrasive dust, and trace sulfide corrosive volatiles, 

forming dual coupling stress of high temperature plus medium aging.

Conventional standard filter elements with NBR nitrile rubber seals only 

support continuous operation at -10°C to 100°C – suffering four irreversible

 failure modes under steel plant high-temperature oil circulation: glass fiber

 media resin thermal decomposition embrittlement, sealing ring thermal 

hardening and oil leakage, end cap adhesive hydrolysis delamination,

 and built-in bypass valve opening pressure drift. Aite High-Temperature 

Resistant Replacement HYDAC Filters become essential spare parts for 

metallurgical hydraulic systems.

As a professional manufacturer specializing in import substitution filter 

consumables (not an authorized HYDAC distributor), we deliver Aite 

High-Temperature Resistant Replacement HYDAC Filters with stable performance, 

significantly shorter delivery cycles, and substantially lower procurement costs 

for industrial facilities worldwide.

2. Graded Temperature Resistance Technical Parameters

Aite High-Temperature Resistant Replacement HYDAC Filters are available in 

three temperature-resistant grades matching steel plant oil temperature

 intervals:

2.1 Grade 1: Standard General Glass Fiber Media (Oil Temperature ≤100°C)

Applications: Cold rolling finishing line hydraulic stations, low-temperature 

water cooling auxiliary equipment. Continuous Temperature Limit: 

-10°C ~ +100°C; resin thermal deformation temperature 112°C. High-Temperature

 Aging Benchmark: After 500h at 100°C, tensile strength retention ≥83%,

 Beta filtration efficiency attenuation ≤3%. Failure Risk Threshold: Long-term 

operation above 105°C causes resin softening and fiber interlayer separation.

2.2 Grade 2: High-Temperature Reinforced Glass Fiber Media (Oil Temperature 

100–120°C)

Applications: Medium-load hot rolling roughing mill hydraulic systems, 

continuous casting secondary cooling hydraulic stations. Continuous Safe 

Range: -10°C ~ +120°C; resin thermal deformation temperature 138°C. Transient 

Peak Tolerance: Up to 130°C for ≤30 minutes. High-Temperature Aging

 Benchmark: After 1000h cyclic testing at 110°C + 130°C peaks, tensile strength

 retention ≥91%, efficiency attenuation ≤1.8%.

2.3 Grade 3: Metallurgical Ultra-High Temperature Full Fluorine Composite

 Media (Oil Temperature 120–140°C)

Applications: Heating furnace front hydraulic cylinder systems, hot rolling 

heavy roughing mills with insufficient cooling. Continuous Ultimate 

Temperature: -10°C ~ +140°C; PTFE isolation membrane thermal stability 

up to 260°C. Transient Peak Tolerance: Up to 150°C for ≤20 minutes. 

Corrosion and High-Temperature Coupling Aging Index: After 1200h at 140°C 

with sulfide impurities, fiber strength retention ≥96%.

3. Temperature Resistance Grading of Sealing Components

Seal Material Temperature Range Applications Key Characteristics

NBR Nitrile Rubber -40°C ~ +100°C (peak 110°C) Grade 1 media only Volume

 swelling 16–22% after 500h above 105°C

FKM Fluororubber -20°C ~ +120°C (peak 130°C) Grade 2 media Volume

 swelling ≤3% after 1000h at 120°C; compression rebound ≥92%

Modified FKM -20°C ~ +140°C (peak 150°C) Grade 3 media For high-viscosity

 aged oil and radiant heat exposure

4. High-Temperature Resistance of Bonding Structure and Valve Assembly

End Cap Adhesive: Standard polyurethane adhesive for Grade 1 (≤100°C);

 high-temperature fluorine-containing epoxy hot-melt adhesive for Grades 2 

and 3 (continuous 145°C, peel strength ≥50 N/cm).

Bypass and Anti-Drain Valve: NBR valve gasket standard version for Grade 1; 

FKM fluororubber valve gasket high-temperature version for Grades 2 and

 3 – maintaining stable opening pressure (3 bar ±10%) within -10°C to 130°C.

5. Steel Plant High-Temperature Working Condition Selection Logic

Working Condition Continuous Oil Temperature Recommended Configuration

 Operation Limit

Cold Rolling Auxiliary ≤100°C (peak ≤105°C) Grade 1 media + NBR seal Install 

heat insulation baffle

Hot Rolling Roughing/Finishing 100–120°C (peak 125–130°C ≤30 min) Grade 2 

media + FKM seal Control cooling flow; avoid >120°C for >4h

Furnace Front Heavy-Load 120–140°C (frequent 140–150°C peaks) Grade 3 

media + modified FKM seal + 304 stainless steel skeleton Install auxiliary cooler;

 shorten replacement cycle by 30%

6. Common High-Temperature Failure Analysis and Troubleshooting

Fault 1: End Cap Oil Leakage, Sealing Ring Hardening and Cracking

· Root Causes: Mismatched NBR seal for oil temperature above 100°C; 

long-term furnace radiation heating

· Solutions: Replace with FKM high-temperature version; wrap 20mm heat

 insulation cotton outside filter housing

Fault 2: Rapid Differential Pressure Rise, Filtration Efficiency Drop, Servo Valve

 Scratching

· Root Causes: Standard low-temperature media used at 120°C continuous

 oil temperature; insufficient cooling circulation

· Solutions: Upgrade to Grade 2 reinforced high-temperature media; 

overhaul hydraulic oil cooling system

7. Daily Maintenance Specifications

· Weekly Heat Insulation Inspection: Check filter housing heat insulation layer;

 repair exposed metal shell

· Shift Differential Pressure Recording: Record real-time pressure difference 

data per shift for hot rolling and furnace front stations

· Prohibited Operations: Do not use high-pressure air gun external flushing; 

do not use water cleaning or solvent soaking; do not mix NBR standard seals on 

high-temperature assemblies

· Seasonal Temperature Correction: In summer, advance filter element 

replacement cycle by 20–30%

8. Frequently Asked Questions (FAQ)

Q1: What are Aite High-Temperature Resistant Replacement HYDAC Filters 

designed for?

A: Aite High-Temperature Resistant Replacement HYDAC Filters are designed

 for steel plant hydraulic systems operating at high oil temperatures – including

 hot rolling mills, continuous casting machines, and furnace front hydraulic 

stations.

Q2: What temperature grades are available?

A: Aite High-Temperature Resistant Replacement HYDAC Filters are available in

 three grades – Grade 1 (≤100°C), Grade 2 (100–120°C), and Grade 3 

(120–140°C with peaks to 150°C).

Q3: What is the continuous safe temperature boundary?

A: The core distinguishing boundary for Aite High-Temperature Resistant

 Replacement HYDAC Filters is 100°C – NBR sealed elements are only for cold

 rolling auxiliary stations below 100°C, while hot rolling and furnace front systems

 require FKM matched elements rated for 120°C or 140°C.

Q4: What sealing materials are available?

A: Aite High-Temperature Resistant Replacement HYDAC Filters offer NBR for 

Grade 1, FKM fluororubber for Grade 2, and modified full-fluorine FKM for 

Grade 3 – matching the temperature grade of the selected media.

Q5: What happens if the wrong seal material is used?

A: Mismatched NBR seals in high-temperature applications cause hardening, 

cracking, and oil leakage – invalidating the 120°C+ temperature resistance

 index of Aite High-Temperature Resistant Replacement HYDAC Filters.

Q6: How does the end cap adhesive perform at high temperature?

A: Aite High-Temperature Resistant Replacement HYDAC Filters use 

high-temperature fluorine-containing epoxy hot-melt adhesive for 

Grades 2 and 3 – with continuous temperature resistance up to 145°C and 

peel strength ≥50 N/cm.

Q7: What is the bypass valve temperature performance?

A: Aite High-Temperature Resistant Replacement HYDAC Filters with FKM 

valve gaskets maintain stable opening pressure (3 bar ±10%) within -10°C to

 130°C – ensuring reliable overload protection.

Q8: How do I select the correct temperature grade?

A: Selection depends on long-term average oil temperature, 

maximum instantaneous peak oil temperature, and daily continuous

 duration of peak temperature surge. Contact our technical team for Aite

 High-Temperature Resistant Replacement HYDAC Filters configuration assistance.

Q9: What maintenance practices extend high-temperature service life?

A: Weekly heat insulation inspection, shift differential pressure recording,

 and avoiding prohibited operations such as high-pressure air gun flushing, 

water cleaning, and mixing NBR seals on high-temperature assemblies.

Q10: What documentation is provided?

A: Each shipment includes EN 10204 material certificates, ISO 16889 filtration 

performance test reports, high-temperature aging test reports, 

dimensional inspection records, and factory quality certificates.

Q11: Can Aite High-Temperature Resistant Replacement HYDAC Filters be

 customized?

A: Yes. Custom options include special media grades, sealing materials, 

and dimensions based on specific working conditions and oil temperature 

profiles.

Q12: Can I order samples before bulk purchase?

A: Yes. We support paid sample orders with production lead time of 

approximately 5–7 days. Sample costs are fully deductible from your first

 bulk order upon approval.

9. Conclusion

The complete temperature resistance performance of Aite High-Temperature 

Resistant Replacement HYDAC Filters is determined by glass fiber media 

heat-resistant grade, sealing ring fluorine rubber material, 

high-temperature epoxy bonding structure, and stainless steel support skeleton. 

Steel mill hydraulic maintenance personnel must classify and select filter 

element temperature resistance grades according to on-site long-term average oil temperature and instantaneous peak thermal load – cooperating with filter housing heat insulation transformation and hydraulic oil cooling circulation optimization to effectively avoid media thermal embrittlement, sealing oil leakage, and bypass valve failure caused by over-temperature operation.

Aite High-Temperature Resistant Replacement HYDAC Filters – three

 temperature grades, FKM and modified FKM sealing options, 

continuous 120°C or 140°C capability. Contact us today for a free configuration 

recommendation and competitive factory-direct quotation within 24 hours.