Product Advantages
1. Perfluorinated Molecular Structure – Resists 1,800+ Chemicals
FFKM is copolymerized from tetrafluoroethylene and perfluoromethyl vinyl ether, replacing all C-H bonds with C-F bonds. This fully fluorinated structure provides resistance to 1,800+ chemicals including strong acids (fuming nitric, concentrated sulfuric, hydrofluoric), strong bases, ketones (acetone, MEK), esters (ethyl acetate), ethers, and amines. Media that attack FKM-ketones, esters, amines-are fully compatible with FFKM.
2. Extreme High-Temperature Resistance – Up to 327℃ Continuous
Standard grades: -45℃ ～ 300℃. High-temperature grades reach 327℃ continuous, with intermittent peaks of 330℃～350℃. No hardening or embrittlement at 316℃ constant or 343℃ intermittent exposure.
3. Low Compression Set at High Temperatures
Hardness: Shore A 50～90. Compression set at 200℃×70h: 18%～26% ; at 275℃×70h: ≤45%. Maintains sealing contact pressure long-term without stress relaxation.
4. High Purity · Metal-Ion-Free · Plasma Resistant
High-purity grades contain no metal ions-suitable for semiconductor processes. Excellent resistance to corrosive plasmas NF₃, CF₄, SF₆-no cracking or deformation in dry etching, CVD, and related processes.
5. Full Size Range ·Customization Available
Cross-section 1.0~7.0mm, OD 10~450mm. Complies with GB/T 3452.1 and AS568. Sample-based customization available without drawings-mold development 3~5 days.
Product Specifications
| Parameter | Specification |
|---|---|
| Material | Perfluoroelastomer (FFKM) |
| Hardness (Shore A) | 70～90 (grade-dependent) |
| Standard Service Temp. | -45℃ ～ 300℃ |
| High-Temp Grade Service Temp. | Continuous to 327℃ ;intermittent 330℃～350℃ |
| Outer Diameter Range | 10mm ～ 450mm |
| Cross-section Range | 1.0mm ～ 7.0mm (common 3.5mm) |
| Color | Black (standard), brown/amber/translucent (high-purity grades) |
| Compression Set | 200℃×70h: 18%～26% (grade-dependent); 275℃×70h: ≤45% |
| Standard | GB/T 3452.1 / AS568 / ISO 3601 / custom drawing |
| Flash Trim | 45° split, trim precision ≤0.1mm, flash-free |
| Surface Quality | Smooth finish, no bubbles, cracks, or impurities |
Applications
- Automotive Industry: Sealing for fuel, engine oil, and cooling systems
- Hydraulics Industry: Sealing for high-pressure cylinders, valve assemblies, and pump bodies
- Petrochemical Industry: Oil-resistant, corrosion-resistant, and high-temperature sealing
- New Energy: Battery thermal management and electric drive system sealing
- Aerospace: High-pressure, high-temperature fuel and hydraulic sealing
- Semiconductor/Pharmaceutical: FFKM for extreme corrosion and high-purity environments
Frequently Asked Questions
What is the difference between FFKM and FKM?
FFKM handles higher temperatures (up to 327℃ vs 200℃ for FKM), resists ketones, esters, amines, strong acids, and plasmas – all of which attack FKM. However, FFKM costs 10–50 times more. Choose FFKM when temperature exceeds 230℃ or when exposed to those aggressive media.
Why is FFKM so expensive?
FFKM requires complex synthesis of perfluorinated monomers and is produced by only a few suppliers (DuPont, 3M, Daikin, Solvay). The manufacturing process is costly, making it 10–50 times the price of FKM. Use it only when FKM cannot meet the service conditions.
What information is required for an FFKM custom quote?
Provide: (1) maximum continuous temperature (to select the correct grade – 230/260/300/327℃), (2) exact chemical and its concentration (e.g., 98% H₂SO₄, MEK), (3) whether it is for semiconductor use (requires metal-ion-free grade), and (4) whether plasma exposure is present (requires plasma-resistant gra
