Heavy-Duty O-Ring for Rock Drill Jumbos This FKM O-ring is engineered to provide reliable sealing in the hydraulic systems of rock drill jumbos, withstanding extreme temperatures, high pressures, and exposure to harsh mining fluids. Its robust design minimizes leaks, reduces maintenance downtime, and extends the service life of hydraulic components.
Technical Specifications & Design
Material & Chemical Resistance:
Constructed from FKM (fluorocarbon rubber) compound, compliant with ASTM D1418, offering exceptional resistance to mineral oils, hydraulic fluids (ISO 6743-4), diesel, and greases. This material retains 90% of its elasticity after 1000 hours of immersion in common mining fluids .
Unlike standard NBR O-rings, FKM withstands continuous operating temperatures up to +200°C, making it suitable for high-friction hydraulic circuits in rock drill jumbos .
Sealing Performance:
7mm cross-section with ±0.1mm tolerance (ISO 3601-1) ensures a precise fit in standard seal grooves, providing effective static and dynamic sealing at pressures up to 20MPa. The 70 Shore A hardness balances flexibility and durability, preventing extrusion under high pressure .
Low compression set (≤25% per ASTM D395) maintains sealing force over 5000 hours of operation, reducing the need for frequent replacements .
Environmental Adaptability:
Operates reliably from -20°C (cold underground mines) to +200°C (high-temperature hydraulic systems), with no degradation in sealing performance. Its resistance to ozone and weathering ensures longevity in both indoor and outdoor mining environments .
Applications
Rock Drill Jumbos: Seals hydraulic cylinders, valve bodies, and pipe connections in drill arm and propulsion systems.
Mining Equipment: Compatible with loaders, excavators, and tunneling machines requiring high-temperature seals.
Industrial Hydraulics: Suitable for heavy-duty hydraulic systems in steel mills, foundries, and construction machinery.
