AS568-024 FFKM O-Ring — 28.3 × 1.78 mm
A compact, low-squeeze section for light-duty static and slow dynamic seals in smaller bore assemblies. With an inside diameter of 28.3 mm and a 1.78 mm cross section, this is a medium-bore seal for mid-size industrial 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 | AS568-024 |
|---|---|
| Inside diameter (ID) | 28.3 mm (1.114 in) |
| Cross section (CS) | 1.78 mm (0.07 in) |
| Outside diameter (OD) | 31.86 mm (1.254 in) |
| Material | Aperflu 2275 perfluoroelastomer (FFKM) |
| Service temperature | up to 200 °C continuous |
Oil & gas and refining
Sour gas, amine systems, hydrocarbons and high-pressure steam are classic FFKM territory. This seal resists rapid gas decompression and maintains integrity in downhole tools, wellhead assemblies and sub-sea connectors.
Why Aperflu 2275 FFKM
Aperflu 2275 delivers Kalrez-class performance in aggressive media at a factory-direct price, with every AS568 size moulded to order and published unit pricing.
Typical applications
Pneumatic fittings, low-pressure hydraulic circuits, valve stems and quick-connect couplings, 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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