AS568-419 FFKM O-Ring — 94.62 × 6.99 mm
A very thick section for the largest diameters and most severe static sealing duties. With an inside diameter of 94.62 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 | AS568-419 |
|---|---|
| Inside diameter (ID) | 94.62 mm (3.725 in) |
| Cross section (CS) | 6.99 mm (0.275 in) |
| Outside diameter (OD) | 108.6 mm (4.276 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
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-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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