AS568-008 FFKM O-Ring — 4.47 × 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 4.47 mm and a 1.78 mm cross section, this is a micro seal for micro-seals and miniature devices. 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 | AS568-008 |
|---|---|
| Inside diameter (ID) | 4.47 mm (0.176 in) |
| Cross section (CS) | 1.78 mm (0.07 in) |
| Outside diameter (OD) | 8.03 mm (0.316 in) |
| Material | Aperflu 2275 perfluoroelastomer (FFKM) |
| Service temperature | up to 200 °C continuous |
Petrochemical processing
Steam crackers, storage and transfer systems handling olefins, aromatics and solvents. This FFKM keeps dimensional stability and seal force where mixed process streams attack conventional elastomers.
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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