FKM 75 Shore A O-Rings for Standard Chemical Plant Service
FKM O-rings at 75 Shore A — the standard fluoroelastomer compound for general chemical plant sealing. It handles the aggressive chemicals, heat, and hydrocarbons found across chemical processing while seating reliably on valves, flanges, and pumps without the extra firmness of 90 durometer.
| Material |
FKM (Fluoroelastomer) |
| Hardness |
75 Shore A |
| Temperature |
-20°C to +200°C (short peaks ~230°C) |
| Color |
Black and others |
| Standards |
AS568, ISO 3601 |
| Sealed Media |
Acids, alkalis, solvents, hydrocarbons, oils, oxidizing agents |
| Not Recommended |
Amines, ketones, esters, hot water/steam (high temp), brake fluid |
Features
- 75 Shore A — the standard FKM balance of sealability and strength
- Broad chemical resistance to acids, solvents, and hydrocarbons
- Continuous service to +200°C for heated process lines
- Resists ozone, weather, and oil better than most elastomers
- Low compression set for stable, long-term sealing
Applications
Chemical plant valves, pumps, flanges, reactors, heat exchangers, piping, dosing and injection lines, and ANSI/API valve seals where the fluid is aggressive but within the standard FKM envelope.
FAQ
Q: Why 75 Shore A for standard chemical plant service?
A: 75 is the standard FKM hardness — a sound balance of sealing and mechanical strength for general chemical duty. It seats well on flanges and valves across a plant, while 90 is reserved for higher-pressure glands needing more extrusion resistance.
Q: What chemicals does FKM resist?
A: Mineral and synthetic oils, most hydrocarbons, many concentrated acids and alkalis, solvents, and oxidizing agents. It is not for amines, ketones, esters, or hot water and steam at high temperature — for those use EPDM or FFKM.
Q: What temperature can it handle?
A: -20°C to +200°C continuous, with short-term peaks around 230°C, which covers most heated process and utility lines.
Q: When would I pick 90 Shore A FKM instead?
A: Choose 90 for higher-pressure glands and where extrusion resistance matters. For the bulk of valve, flange, and pump seals in a plant, 75 Shore A is the right default.
Q: Does FKM handle sour gas and amines?
A: FKM copes with many sour environments using the right cure, but amines used in gas treating attack FKM. Confirm the exact fluid; for amine service consider FFKM or a verified compound.
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