Sensor Cleaning - LFI advice

[Alberti]

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Isopropyl alcohol forms an azeotrope with water at 88% IPA/12% water by weight (96% ethanol/4% water for alcohol). Anything higher than 88% IPA has been azeotropically distilled. I'm not sure how hygroscopic IPA is, so if you left a 100% IPA "solution" out on the bench it might draw water from the atmosphere over time, or it might not. If you keep it in an air-tight container, you should be OK though.

If the bottle is plastic, it will 'leak' water into the bottle. I have a plasic bottle with mineral water designed by Philip Starck, and after 10 years stading 'on exhibit' the bottle is now 30% empty!

So even having this anhydrous thing fully locked it will attract H2O molecules, in effect still slowly 'leaching water from the atmosphere' I think.

[amigadave]

If the bottle is plastic, it will 'leak' water into the bottle. I have a plasic bottle with mineral water designed by Philip Starck, and after 10 years stading 'on exhibit' the bottle is now 30% empty!

So even having this anhydrous thing fully locked it will attract H2O molecules, in effect still slowly 'leaching water from the atmosphere' I think.

 

Yes, that's true. My lab bottle is made of glass (significantly less water-permeable than most plastics), but it is recommended that lab solvents such as this are used within a year or two, so that contamination is not too great.