MadSci Network: Microbiology

Re: why 70% ethanol used instead of 100% ethanol as disinfectant?

Date: Sat Sep 25 17:43:27 1999
Posted By: Artem Evdokimov, PhD student, Structural Biology (Chemistry)
Area of science: Microbiology
ID: 931463434.Mi

Dear User,

I am not an expert on sterilization, however here are my 2 cents:

1) 70% ethanol will cause less "glassification" of the contaminant 
particles and will be more likely to penetrate deeper, resulting in better
quality of treatment.

2) 70% ethanol is better on human skin.

3) 70% ethanol is somewhat cheaper to make and to maintain -- 100% ethanol
is extremely hygroscopic.



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