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O-Rings & Valves: Chemical Compatibility

O-rings are used in many Quantachrome instruments as gas and vacuum-tight seals and valves have polymeric sealing surfaces. O-rings and valves are available in a variety of elastomeric materials and these differ in their compatibilities with different gases and vapors. Listed below are the O-ring and valve materials we most commonly employ and their relative ratings[1] for use with some common fluids.

S = suitable, Ss = suitable for short exposure (<48 hours)
N = not suitable,do not use.

Fluids which are deemed compatible, at least for short periods, withallelastomers listed are highlighted inbold.

Fluid Name Formula Buna-N EPDM Viton Kalrez
Acetone C3H6O N S N S
Acetylene C2H2 S S S S
Ammonia (dry) NH3 S S N S
Argon Ar S S S S
Benzene C6H6 N N S S
Butane C4H10 S N S S
二氧化碳 CO2 S S S S
Carbon monoxide CO S S S S
Cyclohexane C6H12 S N S S
Ethane C2H6 S N S S
Ethanol C2H5OH Ss S S S
Helium He S S S S
Hexane C6H14 S N S S
Hydrogen H2 S S S S
Isopropanol C3H7OH S S S S
Krypton Kr S S S S
甲烷 CH4 S N S S
Nitric oxide NO N N N Ss
Nitrogen N2 S S S S
Nitrogen dioxide/tetroxide NO2(N2O4) N N N Ss
Nitrous oxide N2O S S S S
Pyridine C5H5N N S N S
Sulfur dioxide (dry) SO2 N S Ss S
Sulfur hexafluoride SF6 S S S S
Xylene C8H10 N N S S

[1] This information has been compiled from the following sources: Cole-Parmer Parker Seal Group (O-ring Division), and Marco Rubber. This information refers to chemical compatibility only and does not imply suitability for use according to any other criteria.

If you do not see the fluid-elastomer pair of interest, please visit one of the following sites to determine suitability:

If you are unsure regarding what O-rings and valve types are used in your particular Quantachrome instrument or whether a fluid not listed here can be reasonably employed, please contact Quantachrome by filling outthis contact form, calling our toll-free number 1-800-989-2476.

Always involve your health and safety management when using compressed gases, refer to the appropriate MSDS available from your gas supplier (not Quantachrome) and observe all safety precautions printed in the instrument operator's manual.

Quantachrome makes no express or implied warranties or guarantees regarding the information above. Quantachrome cannot be responsible for conditions of use of any gases and shall not be liable for any injury, damage or loss resulting from the use of any of the listed materials above.