AS568-408 FFKM O-Ring — 59.69 × 6.99 mm
A very thick section for the largest diameters and most severe static sealing duties. With an inside diameter of 59.69 mm and a 6.99 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 | AS568-408 |
|---|---|
| Inside diameter (ID) | 59.69 mm (2.35 in) |
| Cross section (CS) | 6.99 mm (0.275 in) |
| Outside diameter (OD) | 73.67 mm (2.9 in) |
| Material | Aperflu 2275 perfluoroelastomer (FFKM) |
| Service temperature | up to 200 °C continuous |
Chemical synthesis and reactors
Reactor flanges, distillation columns, agitators and transfer lines carrying corrosive intermediates. The perfluoroelastomer resists swelling and degradation, keeping batch consistency and seal integrity across long runs.
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
Large-diameter flanges, autoclave and reactor seals, structural 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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