B13 external back-up rings are engineered with a positively activated design backing up on triangular faces to specifically prevent external seal extrusion and material damage. This precision-engineered triangular geometry allows the ring to be energized under pressure, effectively bridging the clearance gap between the external seal and the cylinder bore. Our high-precision CNC turned materials, including PTFE, POM, and high-hardness Polyurethane, provide an exceptional modulus to resist "seal nibbling" even in high-temperature or ultra-high pressure environments. By providing a robust, stable support base for external O-rings and dynamic seals, the B13 profile ensures long-term leak-free performance and system integrity for critical applications in space exploration, defense, and heavy hydraulics.
| Technical Parameter | Specification | Material Remark |
|---|---|---|
| Pressure Resistance | Up to 100 MPa+ | High Pressure Support |
| Temperature Range | -200°C to +260°C | PTFE® / PEEK® |
| Design Geometry | Triangular Face | External Positive Activation |
| Media Compatibility | Oil, Water, Chemicals, Gas | Universal |
| Material Option 1 | PTFE / Filled PTFE | Standard Chemical |
| Material Option 2 | POM (Polyacetal) / PA (Nylon) | High Modulus |
| Material Option 3 | PEEK / Carbon PEEK | Extreme Pressure |
| Material Option 4 | High Hardness PU (Polyurethane) | Wear Resistant |
| Material Option 5 | NBR 90 / FKM 90 (Rubber) | Elastic Support |
- Triangular face positively activated design specifically engineered to prevent external seal extrusion under pressure.
- Available in endless or split configurations to ensure a precise fit for complex external sealing grooves.
- Dual-functionality as a high-modulus external pressure barrier and a protective shield against seal material loss.
- Superior material versatility including PTFE, POM, and high-hardness PU to withstand abrasive media and chemicals.
We specialize in bespoke sealing solutions, offering custom-engineered B13 external back-up rings tailor-made to your specific pressure conditions and hardware dimensions. Leveraging instant seal machining, we offer 24h fast lead times for emergency production, ensuring your critical operations resume without costly downtime. Our ISO 9001 certified facility provides Direct Factory Price on all B13 back-up rings with no-mold requirements for bespoke diameters up to 3000mm.
Disclaimer: Variseal®, FlexiSeal®, and other brand names are registered trademarks of their respective owners. Carlock Sealing products are high-quality equivalents and are not affiliated with these trademark holders.
