Isopropanol 70% vs 99% for cleaning/disinfecting

Which is the better option for disinfecting/cleaning glassware? 


  • Bill_TogeBill_Toge Member, Professional Chemist
    either for cleaning, but 70% works better for disinfection as it evaporates more slowly, so the contact time is longer
    UK based formulation chemist. Strongest subjects: hair styling, hair bleaches, hair dyes (oxidative and non-oxidative) I know some stuff about: EU regulations, emulsions (O/W and W/O), toothpaste, mouthwash, shampoos, other toiletries
  • PharmaPharma Member, Pharmacist
    Also, killing bacteria/fungi requires some water whereas killing viruses works better with pure alcohol.
    Cleaning fat/oil or electronics (by dipping) is better with pure isopropanol. For labware, cell phones, screens etc. 70% has proven very practical & helpful.
  • Is hydrogen peroxide not the best for cleaning residual fatty surfaces on metal jugs used to make creams? 
  • PharmaPharma Member, Pharmacist
    Hydrogen peroxide solubilises (i.e. cleans) the same things as water. Fats ain't water soluble but partially soluble in isopropanol.
    Ammonia is sometimes used to remove grease but given its smell you might opt for alternatives.
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