AS568-383 FFKM O-Ring — 354.97 × 5.33 mm
A thick, durable section engineered for large-diameter static seals and high-tolerance groove applications. With an inside diameter of 354.97 mm and a 5.33 mm cross section, this is a very-large seal for the largest diameters and heavy static service. 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 | AS568-383 |
|---|---|
| Inside diameter (ID) | 354.97 mm (13.975 in) |
| Cross section (CS) | 5.33 mm (0.21 in) |
| Outside diameter (OD) | 365.63 mm (14.395 in) |
| Material | Aperflu 2275 perfluoroelastomer (FFKM) |
| Service temperature | up to 200 °C continuous |
Pharmaceutical and food processing
Steam-in-place and clean-in-place cycles, aggressive cleaning agents and potent active pharmaceutical ingredients (APIs) demand a seal that stays inert and dimensionally stable. Aperflu 2275 is suited to product-contact and CIP/SIP duties where extractables must be kept to a minimum.
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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