AS568-233 FFKM O-Ring — 72.62 × 3.53 mm
A robust, high-squeeze section for demanding static and reciprocating seals in larger equipment. With an inside diameter of 72.62 mm and a 3.53 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 | AS568-233 |
|---|---|
| Inside diameter (ID) | 72.62 mm (2.859 in) |
| Cross section (CS) | 3.53 mm (0.139 in) |
| Outside diameter (OD) | 79.68 mm (3.137 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 active pharmaceutical ingredients demand a seal that stays inert and dimensionally stable. Aperflu 2275 suits product-contact and CIP/SIP duties.
Why Aperflu 2275 FFKM
Perfluoroelastomer (FFKM) is the most chemically and thermally resistant elastomer class available — rated for continuous use beyond 200 °C and stable against well over 1,600 chemicals, which is why it is specified where FKM, silicone and EPDM fail.
Typical applications
Hydraulic cylinders, chemical process valves, wellhead and downhole tooling, 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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