AS568-178 FFKM O-Ring — 247.32 × 2.62 mm
A balanced industrial section for static face, radial and slow rotary seals across a wide diameter range. With an inside diameter of 247.32 mm and a 2.62 mm cross section, this is a large-bore seal for large-bore machinery and process equipment. Moulded from Aperflu 2275 perfluoroelastomer (FFKM) for continuous service up to 200 °C, this seal resists hot acids, caustics, solvents, fuels and steam.
Dimensions
| Dash number | AS568-178 |
|---|---|
| Inside diameter (ID) | 247.32 mm (9.737 in) |
| Cross section (CS) | 2.62 mm (0.103 in) |
| Outside diameter (OD) | 252.56 mm (9.943 in) |
| Material | Aperflu 2275 perfluoroelastomer (FFKM) |
| Service temperature | up to 200 °C continuous |
Aerospace and analytical instruments
Fuel, hydraulic fluid and solvent exposure across a wide temperature window is handled with low compression set, making this seal suitable for flight-critical and high-purity analytical fluid paths.
Why Aperflu 2275 FFKM
The compound is moulded, de-flashed and inspected to a burr-free finish, and every batch ships with its own certificate of analysis for traceability.
Typical applications
General machinery, pumps, compressors, gearboxes and process connections, where Aperflu 2275 outperforms FKM and EPDM in aggressive media and elevated temperature.
Compound properties
| Property | Typical value | Test method |
|---|---|---|
| Hardness | 70 – 71 Shore A | GB/T 39693.4 |
| Tensile strength | 21.2 – 21.8 MPa | GB/T 528 (dumbbell type 2) |
| Elongation at break | 155 – 170 % | GB/T 528 (dumbbell type 2) |
| Compression set, 200 °C × 70 h (25 %, method B) | 15 – 16 % | GB/T 7759.1 |
All values are typical. Every batch is shipped with an individual certificate of analysis and may differ from the typical values listed here.
Chemical resistance
| Media group | Rating |
|---|---|
| Hot organic & inorganic acids | Excellent |
| Caustics (NaOH up to 50 %) | Excellent |
| Ketones, aldehydes, esters, ethers, alcohols | Excellent |
| Solvents, fuels, hydrocarbons, sour gases | Excellent |
| Steam and hot water | Excellent |
| Amines (high temperature, concentrated) | Good – contact us for grade selection |
| Clean-in-place (CIP) / steam-in-place (SIP) agents | Excellent |
| Active pharmaceutical ingredients (APIs) | Excellent |
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