AS568-021 FFKM O-Ring — 23.52 × 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 23.52 mm and a 1.78 mm cross section, this is a small-bore seal for compact assemblies and small-bore 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 | AS568-021 |
|---|---|
| Inside diameter (ID) | 23.52 mm (0.926 in) |
| Cross section (CS) | 1.78 mm (0.07 in) |
| Outside diameter (OD) | 27.08 mm (1.066 in) |
| Material | Aperflu 2275 perfluoroelastomer (FFKM) |
| Service temperature | up to 200 °C continuous |
Oil refining
Distillation units, catalytic crackers and hydrotreaters expose seals to hot hydrocarbons, sour streams and steam. Aperflu 2275 maintains a stable seal through thermal cycling and aggressive process media.
Why Aperflu 2275 FFKM
Perfluoroelastomer (FFKM) is the most chemically and thermally resistant elastomer class available — rated for continuous use beyond 200 °C and stable against well over 1,600 chemicals, which is why it is specified where FKM, silicone and EPDM fail.
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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