AS568-007 FFKM O-Ring — 3.69 × 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 3.69 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 | AS568-007 |
|---|---|
| Inside diameter (ID) | 3.69 mm (0.145 in) |
| Cross section (CS) | 1.78 mm (0.07 in) |
| Outside diameter (OD) | 7.25 mm (0.285 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 and excellent elastic recovery, making this seal suitable for flight-critical fuel systems and high-purity analytical fluid paths.
Why Aperflu 2275 FFKM
Compared with bisphenol-cured FKM, peroxide-cured FFKM keeps its sealing force longer at temperature — critical for static and slow-dynamic duty in chemical service.
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
The fully fluorinated backbone of Aperflu 2275 resists the aggressive media that attack FKM, EPDM and silicone — including concentrated hydrochloric, nitric, sulfuric and glacial acetic acids, strong caustics, and a broad range of solvents and fuels. Refer to the rating table below for guidance, and confirm your exact media with our engineers.
| Media group | Rating |
|---|---|
| Hydrochloric acid | Excellent |
| Nitric acid | Excellent |
| Sulfuric acid | Excellent |
| Acetic acid (glacial) | Excellent |
| Other hot organic & inorganic acids | Excellent |
| Caustics (ammonia, NaOH up to 50 %) | Excellent |
| Ketones, aldehydes, esters, ethers, alcohols | Excellent |
| Solvents, fuels, hydrocarbons, sour gases | Excellent |
| Steam and hot water | Excellent |
| Ethylene diamine & high-temp amines | Good – contact us for grade selection |
| Clean-in-place (CIP) / steam-in-place (SIP) agents | Excellent |
| Active pharmaceutical ingredients (APIs) | Excellent |
Ratings are typical for peroxide-cured FFKM compounds at room and elevated temperature. Final suitability depends on concentration, temperature and pressure — contact us for a compound recommendation against your specific media.
More AS568 1.78 mm cross-section sizes
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