Pro/Forums - View Single Post - 91% Isopropyl Alchohol

Anonymous · 11-28-2005, 05:22 PM

Ethyl and isopropyl alcohol are quite similar, especially their flash points, boiling points, density, flammability,and reactivity. Both are used effectively as disinfectants.

A comparison of physical properties:
Isopropyl alcohol:
Specific heat: 2.6 J/g*K
Viscosity: 2.43 cP @ 20 °C
Molar mass: 60.1 g/mol
Vapor pressure: 7879.33 Pa at 30°C

Ethyl alcohol:
Specific heat: 2.44 J/g*K
Viscosity: 1.2 cP @ 20 °C
Molar mass: 46.07 g/mol
Vapor pressure: 14000 Pa at 30°C

I would only use these in a closed system and avoid contact with aluminum for isopropanol. No data on correlation between concentration and effects as a biocide (too lazy to dig). Both should be fine with popular WCing tubings like Tygon, PVC, etc.. and HDPE reservoirs. Acrylic products may not. Iso has more desirable properties other than higher viscosity. Could you elaborate stev?

11-28-2005, 05:22 PM	#8
Anonymous Cooling Neophyte Join Date: Jul 2003 Location: If only I knew... Posts: 18	Re: 91% Isopropyl Alchohol - eat plastic? Ethyl and isopropyl alcohol are quite similar, especially their flash points, boiling points, density, flammability,and reactivity. Both are used effectively as disinfectants. A comparison of physical properties: Isopropyl alcohol: Specific heat: 2.6 J/gK Viscosity: 2.43 cP @ 20 °C Molar mass: 60.1 g/mol Vapor pressure: 7879.33 Pa at 30°C Ethyl alcohol: Specific heat: 2.44 J/gK Viscosity: 1.2 cP @ 20 °C Molar mass: 46.07 g/mol Vapor pressure: 14000 Pa at 30°C I would only use these in a closed system and avoid contact with aluminum for isopropanol. No data on correlation between concentration and effects as a biocide (too lazy to dig). Both should be fine with popular WCing tubings like Tygon, PVC, etc.. and HDPE reservoirs. Acrylic products may not. Iso has more desirable properties other than higher viscosity. Could you elaborate stev? Last edited by Anonymous; 11-28-2005 at 05:31 PM.