FKM Viton Flame Retardant Seal Ring
FKM Viton Flame Retardant Seal Ring is a precision-molded fluorocarbon elastomer component engineered for high-risk industrial environments where fire safety, chemical resistance, and thermal stability are critical. Each ring is manufactured from premium-grade FKM (Fluorocarbon Rubber) and features a distinctive SPI D1 lightly sandblasted surface finish, creating a characteristic brown color with concentric tree-ring-like texture that prevents component adhesion and facilitates easy handling during assembly.
As a specialized B2B supplier of custom fire-resistant sealing solutions, Xiamen Best Seal offers fully customizable FKM seal rings tailored to your exact dimensional, hardness, and performance requirements. These seals deliver industrial-grade performance across automotive fuel systems, electrical equipment, chemical processing, and aerospace applications where ignition risk must be minimized and seal integrity cannot be compromised.


SPI D1 Surface Finish: The "Tree Ring" Texture
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Engineered Surface for Industrial HandlingThe distinctive concentric ring pattern you see on these brown FKM seals is the result of precision mold cavity treatment. During vulcanization, the lightly sandblasted mold surface imprints a controlled micro-texture onto the rubber, creating the characteristic "tree ring" appearance.
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Superior Flame Retardancy & Fire Safety
FKM Viton is inherently flame-resistant due to its high fluorine content, making it self-extinguishing when removed from direct flame. This critical safety feature makes these seal rings essential for applications where ignition sources or high temperatures are present.
Does not support combustion when flame source is removed, critical for automotive and electrical safety systems.
Minimal toxic fume emission compared to standard elastomers, improving evacuation safety in enclosed spaces.
FKM Material Excellence
| Performance Factor | FKM Viton Capability | Industrial Benefit |
|---|---|---|
| Temperature Range | -20°C to +230°C (continuous) | Withstands engine compartments, exhaust systems |
| Chemical Resistance | Excellent vs. oils, fuels, acids, solvents | Long service life in aggressive media |
| Compression Set | Low permanent deformation (<25% @ 200°C/70h) | Maintains seal integrity under sustained pressure |
| Weathering Resistance | Superior UV and ozone stability | Outdoor applications without degradation |
| Permeability | Very low gas/vapor transmission | Prevents fuel vapor leakage in emission systems |
Custom Material Grades
- ˚ ✵ FKM Type A (Standard fuel/oil resistance)
- ˚ ✵ FKM Type B (Enhanced acid resistance)
- ˚ ✵ FKM GFLT (Low-temperature flexibility)
Hardness Options
- ˚ ✵ 70 Shore A (Standard sealing)
- ˚ ✵ 75 Shore A (High-pressure applications)
- ˚ ✵ 90 Shore A (Extreme load bearing)
Product Advantages
✬ * Why Choose Our FKM Flame Retardant Seal Rings?
- Inherent Fire Safety – Self-extinguishing fluorocarbon formulation for critical fire-risk applications
- Precision Molding – Dimensional accuracy within ±0.15mm for reliable fit in automated assembly
- Anti-Adhesion Surface – SPI D1 finish prevents sticking, enabling high-speed production line integration
- Extended Service Life – Superior heat and chemical resistance reduces maintenance frequency and downtime
- Universal Compatibility – Suitable for static and low-speed dynamic sealing applications across industries
☾. ° Xiamen Best Seal Custom Manufacturing
- Full Customization Service – Any size from 5mm to 500mm+ OD, custom cross-sections available
- Controlled Surface Finishing – SPI D1, D2, or polished finishes per customer specification
- Color Coding Options – Standard brown, or custom Pantone matching for inventory management
- Material Traceability – Batch-specific COA and compound verification reports provided
- Rapid Prototyping – Sample production in 5-7 days for design validation and testing
Fire-Critical Industrial Applications
Automotive & TransportationEssential for fuel injection systems, turbocharger seals, and emission control valves where fuel vapor containment and high-temperature resistance are mandatory. Electrical & ElectronicsUsed in transformer bushings, cable glands, and switchgear enclosures to prevent fire propagation in high-voltage environments. |
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B2B Quality Assurance & Custom Services
FTIR spectroscopy and hardness testing confirm FKM grade and cure state for every production batch.
100% optical measurement of critical dimensions using automated vision systems.
Visual inspection ensures consistent SPI D1 texture and absence of flash, voids, or contamination.
Packaging & Shipping
📦 Packaging Options
We provide flexible packaging solutions based on product size, order quantity, protection requirements, and customer preferences. Both standard and special packaging options are available to ensure safe delivery and convenient handling.

| Category | Packaging Type |
|---|---|
| Standard Packaging | Large Poly Bags (Bulk Distribution) |
| Small PE Bags (Inventory Ready) | |
| Foam / Bubble Protective Layering | |
| Special Packaging | Blister Packaging (Retail/Clean-room Ready) |
| Inflatable Shock-Proof Packaging | |
| Heat Shrink Film + Cardboard Reinforcement | |
| Sleeve Packaging (Protective tube for delicate geometries) | |
| Customization Available: Labels, Part Numbers, Barcodes, Batch Info, or Customer Branding. | |
🚚 Shipping & Logistics
We offer multiple shipping methods with flexible delivery options to meet your project timelines.
| Item | Details |
|---|---|
| Shipping Methods | Express (DHL / FedEx / UPS), Air Freight, Sea Freight |
| Delivery Lead Time | Express: 3–5 days | Air: 5–7 days | Sea: 25–45 days |
| Export Packing | Standard export-grade heavy-duty cartons, palletized if required |
| Trade Terms | EXW, FOB Xiamen, CIF, DDP available |
| Shipping Port | Xiamen Seaport / Xiamen Airport, China |
💡 Secure & Reliable Delivery:
All FKM seal rings are packed to prevent contamination, deformation, and surface damage, ensuring your components arrive in optimal condition for immediate use or assembly.
Certificates & Compliance
🏆 Quality Standards: ISO 9001:2015, RoHS 2.0, REACH Compliant
⚙️ Material Testing: ASTM D2000, Hardness (Shore A), Compression Set, Tensile Strength reports available per batch.

⑅ˏ͛- High-Performance Sealing Solutions ☆.*
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