These Buna-N O-rings can be used as spares or to replace the O-rings on our ISO centering ring seal assemblies. Buna-N (N674-70 compound) is black colored elastomer with a bakeout rating of 80°C and is less expensive and seals easier than lasts longer than Buna-N.
Features
Elastomer Seal Comparison
| Buna-N | Viton | |
|---|---|---|
| Compound | N674-70 | V747-75 |
| Color | Black | Black |
| Bakeout | 80°C | 150°C |
| Benefits | Seals easier, lower cost | High temperature, lasts longer |
Viton® is recommended where temperatures, chemical resistance or long installed life make it beneficial. Use Buna-N where temperatures are moderate, and installed useful life is consistent with this material. The centering ring is available in stainless steel or aluminum. Use stainless steel where chemical resistance is needed. Flanges and seals are designed to be tightened to metal to metal contact.
Resources
Literature
Series 31 ISO-KF Vacuum Components & Fittings(1.1 MB, PDF)
