Anti-Extrusion Rings – Professional Backup Sealing Solutions for High-Pressure Environments
Anti-Extrusion Rings (commonly referred to as Backup Rings or PARB rings) are high-modulus components designed to support primary seals like O-rings in high-pressure hydraulic and pneumatic applications. Their primary function is to eliminate "seal extrusion" into the clearance gap, which is the leading cause of premature seal failure in systems exceeding 100 Bar (1500 PSI). At Xiamen Best Seal, we manufacture precision anti-extrusion rings from elite materials like PTFE, PEEK, and hard-durometer Polyurethane to ensure your sealing systems remain hermetic under extreme load cycles.
Our Industrial Backup Rings are available in solid, spiral, and split configurations, all supported by PPAP Level 3 documentation and AQL 1.0 - 1.5 quality standards. With 100% CCD Automated Optical Inspection, we serve as a mission-critical B2B partner for Tier-1 aerospace, oil & gas, and heavy machinery manufacturers.
The Anatomy of Extrusion Protection
Functional Barrier EngineeringThe Anti-Extrusion Ring acts as a bridge between the flexible primary seal and the metallic extrusion gap:
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Material Engineering & High-Pressure Resistance
1. Engineered Backup Ring Materials
| Material | Key Features | Pressure Limit Support |
|---|---|---|
| PTFE (Virgin/Filled) | Low Friction & Chemical Defense | Up to 350 Bar (With Fillers) |
| NBR (Hard 90A) | Elastic Memory & Oil Resistance | Standard Hydraulic (100-250 Bar) |
| PEEK | Extreme Temperature & Strength | Ultra-High Pressure (700 Bar+) |
| PU (Polyurethane) | High Tensile & Tear Strength | Heavy Duty Dynamic (400 Bar+) |
| FKM (90A) | Heat & Aggressive Fluid Defense | High-Temp Oil Systems (+200°C) |
2. Configuration & Surface Customization
| Design Variant | Operational Purpose & Installation Advantage |
|---|---|
| Spiral / Multi-Turn | Easy installation over shafts without stretching; compensates for thermal expansion. |
| Split / Scarf Cut | Allows for installation in non-removable hardware; easy field replacement for seal kits. |
| Solid (Endless) | Maximum extrusion resistance for high-speed dynamic or ultra-precise static seals. |
| Concave Face | Contours to the O-ring profile to minimize point-stress and increase seal lifespan. |
✧ Precision Quality & Inspection Data ✧
• 100% CCD Automated Optical Sorting scans for ring thickness variance and split-cut integrity.
• PPAP Level 3 (Production Part Approval Process) support ensures precision for automotive and oil-field OEM.
• AQL 1.0 - 1.5 Calibration – Stringent sampling for high-stakes industrial power environments.
• Modulus Verification: Every batch is tensile-tested to ensure the material remains rigid under design pressure.
Global Industry Integration
High-Pressure Downhole Tools
High-PSI Cylinder Actuators
Brake & Landing Gear Controls
Stamping & Injection Machinery
Scaling Your Sealing Supply
★ Factory Capacity Specs
We maintain specialized production lines for Anti-Extrusion Backup Rings, supporting both polymer machining and elastomer molding.
- ◌ Machining & Molding: Capabilities for both high-precision CNC-machined polymers and large-scale molded rings.
- ◌ Custom Hardness Control: In-house mixing to achieve exact modulus requirements (up to 95 Shore A or PEEK grades).
- ◌ AS568 Standard Stock: Massive inventory of standard O-ring companion backup sizes for rapid dispatch.
Packaging & Shipping
📦 Packaging Options
We provide precision-focused packaging to ensure your Anti-Extrusion Rings maintain their dimensional flatness and edge sharpness during transport.
| Category | Packaging Type |
|---|---|
| Standard Packaging | Large Poly Bags (Bulk Industrial Pack) |
| Small Poly Bags (Counted Packs) | |
| Foam / Bubble Protective Packaging | |
| Special Packaging | Blister Packaging for kits and precision sets |
| Inflatable Packaging for heavy-duty protection | |
| Plastic Heat Shrink Packaging + Cardboard Reinforcement | |
| Sleeve Packaging (Protective Tubes for ring edges) | |
| Customization Available: Labels, part numbers, barcodes, batch info, or customer branding upon request | |
🚚 Shipping & Logistics
| Item | Details |
|---|---|
| Shipping Methods | Express (DHL / FedEx / UPS), Air Freight, Sea Freight |
| Delivery Time | Express: 3–5 days | Air: 5–7 days | Sea: 25–35 days |
| Export Packing | Standard export cartons, palletized for heavy industrial loads |
| Trade Terms | EXW, FOB, CIF, DDP / DDU available |
| Shipping Port | Xiamen, China |
Compliance & Quality Certifications
🏆 Global Recognition: ISO 9001:2015, REACH SVHC, RoHS 2.0, IATF 16949 Ready.
Industry Feedback & Success Stories
🌟🌟🌟🌟🌟
"The PEEK anti-extrusion rings from Best Seal solved our downhole tool failure issues. They held up perfectly at 15,000 PSI."
-- Senior Drilling Engineer, Oil & Gas OEM
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"Technical precision is excellent. The scarf-cut backup rings were extremely easy to install in our landing gear actuators."
-- Logistics Director, European Aerospace Components
Technical FAQ – Anti-Extrusion & Backup Ring Queries
❓ When do I need an Anti-Extrusion ring?
We recommend using a Backup Ring whenever system pressure exceeds 100 Bar (1500 PSI) or when clearance gaps are overly wide for a standard O-ring.
❓ What is the difference between split and solid rings?
Split/Scarf-cut rings are ideal for field installation without stripping hardware. Solid rings provide maximum support for extreme dynamic high-pressure environments.
Related High-Pressure Sealing Solutions
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