Products
FFKM O-Rings
Standard and custom FFKM O-rings for semiconductor, chemical and high-temperature service.
XINCHEN FFKM O-rings are moulded from our own OM-series perfluoroelastomer (FFKM) compounds. With a fully fluorinated backbone, no C–H bonds remain in the polymer main chain, which gives the compound its broad chemical inertness and high thermal stability.
O-rings are available in AS-568 (imperial dash) and ISO 3601 (metric) size systems, and can be moulded to a customer drawing where a standard size does not fit the groove.
Key characteristics
- Operating range from −42 °C to +320 °C depending on grade
- Compression set 16–23 % (ASTM D395 Method B, 25 % deflection, per-grade conditions)
- Hardness 70–90 Shore A (ASTM D2240)
- AS-568 and ISO 3601 standard sizes, plus custom tooling
- Flexible order quantities — samples from a single piece, low-volume production supported
Specifications
- Hardness
- 70–90 Shore A (ASTM D2240)
- Tensile strength
- ≥ 15 MPa (ASTM D412)
- Elongation at break
- ≥ 100 % (ASTM D412)
- Compression set
- 16–23 % (ASTM D395 Method B, 25 % deflection)
- Service temperature
- −42 °C to +320 °C (grade dependent)
- Size systems
- AS-568 / ISO 3601 / customer drawing
- Standard CSD
- 1.78 / 2.62 / 3.53 / 5.33 / 6.99 mm
- Fluorine content
- ≈ 72.5 wt% (vs 65.7–70.5 wt% for FKM)
Typical applications
- Chamber seals, slit and pendulum valves, gas inlets
- KF fittings, viewports and exhaust lines
- Pumps, valves, reactors and mechanical seals
- Analytical instruments, spray and dispensing equipment
Standards
AS-568 · ISO 3601 · ASTM D1418 (FFKM) · ASTM D2240 · ASTM D412 · ASTM D395
Grades used in this product line
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