AS568-319 FFKM O-Ring — 26.34 × 5.33 mm
A thick, durable section engineered for large-diameter static seals and high-tolerance groove applications. With an inside diameter of 26.34 mm and a 5.33 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 | AS568-319 |
|---|---|
| Inside diameter (ID) | 26.34 mm (1.037 in) |
| Cross section (CS) | 5.33 mm (0.21 in) |
| Outside diameter (OD) | 37.0 mm (1.457 in) |
| Material | Aperflu 2275 perfluoroelastomer (FFKM) |
| Service temperature | up to 200 °C continuous |
Oil & gas and refining
Sour gas, amines, hydrocarbons and high-pressure steam are classic FFKM territory. This seal retains integrity in downhole tools, wellhead assemblies and sub-sea connectors, delivering predictable, long service life in the harshest production environments.
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
Large flanges, vessel and tank closures, heavy machinery and static joints, 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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