engineered sealing solutions
High Pressure Silicone Seals for Hydraulic & Pneumatic Systems
Modern hydraulic and pneumatic systems demand absolute reliability under extreme pressure. Our high-performance silicone seals combine exceptional elasticity, thermal stability, and chemical resistance to withstand 10,000+ psi while maintaining a leak-free interface. Developed for linear and rotary motions, they outperform conventional elastomers in both dynamic and static applications.
Critical performance advantages
➜ Extreme pressureEngineered for continuous operation up to 15,000 psi (1034 bar) with minimal compression set.
➜ Thermal rangeStable sealing from -60°C to +230°C, suitable for extreme environmental cycles.
➜ Media compatibilityResists water-glycol, phosphate esters, synthetic oils, and many hydraulic fluids.
➜ Low frictionAvailable with bonded PTFE or molybdenum disulfide for stick-slip free actuation.
Material specifications & ratings
Standard silicone compound (HS70)
| Property |
Test method |
Value / range |
| Hardness (Shore A) | ASTM D2240 | 70 ± 5 |
| Tensile strength | ASTM D412 | ≥ 9.5 MPa |
| Elongation at break | ASTM D412 | 320% |
| Compression set (22h/175°C) | ASTM D395 B | ≤ 22% |
| Max. operating pressure | internal | 15,000 psi (dynamic with backup) |
System compatibility & dimensions
| Application type |
Standard profile |
Size range (inch/mm) |
| Hydraulic piston seals | U‑cup / step seal | 0.5″ – 20″ (12–500 mm) |
| Pneumatic rod wipers | double lip / scraper | 0.25″ – 12″ (6–300 mm) |
| Rotary shaft seals | spring‑energized | up to 8″ (200 mm) |
| Flange / static face | O‑ring / custom molded | any custom size |
Why silicone for extreme hydraulics?
While traditional NBR or FKM seals handle many fluids, high-pressure silicone offers unique advantages: flexibility at low temperatures that prevents brittle fracture, excellent resistance to compression set after repeated pressurisation, and compliance with FDA/NSF where incidental fluid contact occurs. Our proprietary high-modulus silicone compounds are reinforced with nano-silica to resist extrusion even with large clearances.
In pneumatic systems, the lack of lubricating oil can cause rapid wear. Our low-friction silicone blends incorporate permanent lubricants, reducing breakout friction by up to 40% compared to standard nitrile. This guarantees smooth actuation in critical control valves and cylinders.
✓ field proven
Used in subsea hydraulic actuators, aerospace landing gear, and high-speed press lines — silicone seals outlast conventional materials 2:1 under pressure spikes.
Custom design & extrusion profiles
Our engineering team supports custom profiles, backup ring integration, and composite seals with bonded PTFE. Finite element analysis (FEA) available for high-pressure validation.
