Even though you may think the higher concentration is more effective, experts say 70% is actually better for disinfecting. It has more water, which helps it to dissolve more slowly, penetrate cells, and kill bacteria.
WHO recommended 75% IPA for hand sanitizers. Earlier recommended IPA percentage was 65-70%. When the IPA percentage goes up, water content goes down. It means the evaporation rate of IPA becomes high. Therefore, the contact time becomes low. I conducted a lab trial with two concentrations of IPA. 65% and 70%. 65% IPA containing hand sanitizer gave a good result than 70% IPA hand sanitizer. In this case, will 75% provide a good result?
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WHO recommended 75% IPA for hand sanitizers. Earlier recommended IPA percentage was 65-70%. When the IPA percentage goes up, water content goes down. It means the evaporation rate of IPA becomes high. Therefore, the contact time becomes low. I conducted a lab trial with two concentrations of IPA. 65% and 70%. 65% IPA containing hand sanitizer gave a good result than 70% IPA hand sanitizer. In this case, will 75% provide a good result?
Explanation: