Auto Rubber Bend Hoses – EPDM Hose Elbow Curved Coolant Hoses
Our EPDM curved coolant elbow hoses are pre-formed rubber hoses specifically designed for automotive and industrial cooling systems. Manufactured from Ethylene Propylene Diene Monomer (EPDM) rubber, they offer excellent heat resistance, aging resistance, and coolant corrosion resistance. These hoses are widely used in automobiles, trucks, buses, tractors, and construction machinery for radiator connections and engine coolant delivery systems.
EPDM material provides outstanding resistance to ozone, UV radiation, and weathering. Under 50×10⁻⁸ ozone concentration at 30% elongation, the hose shows no cracking for up to 150 hours.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Material | EPDM (inner tube & outer cover) + Polyester/Aramid fiber reinforcement |
| Operating Temperature | -40°C to +135°C (standard EPDM); up to +150°C with special formulation |
| Working Pressure | 0.3MPa ~ 0.57MPa (depending on inner diameter) |
| Burst Pressure | ≥0.9MPa, up to 1.4MPa+ |
| Angle Options | 45°/90°/135°/180° pre-formed elbows; custom shapes available |
| Inner Diameter Range | 8mm ~ 80mm (1/4" ~ 3") |
| Standards Compliance | SAE J20R3/R4 Class D2, DIN 73411 Class A |
Manufacturing Process (Factory Capability Showcase)
We operate a complete EPDM hose production line with the following process flow:
Compound Mixing → Filtration → Inner Tube Extrusion → Knitted Reinforcement → Outer Cover Extrusion → Cutting → Mandrel Insertion → Vulcanization → Pressure Testing → End Trimming → Cleaning → Printing/Marking → Packaging & Storage
Core Process Highlights:
Cold-feed extruder for tube production, ensuring dimensional stability
Knitted reinforcement structure balancing strength and flexibility
Steam vulcanization in autoclave for uniform curing
100% individual pressure testing (0.4MPa, 60 seconds) to guarantee quality
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