Apparemment, le type d'alcool et sa concentration varie :

https://en.wikipedia.org/wiki/Hand_sanitizer#Composition :
Products with 60% to 95% alcohol by volume are effective antiseptics. Lower or higher concentrations are less effective; most products contain between 60% and 80% alcohol.
In addition to alcohol (ethanol, isopropanol or n-Propanol), hand sanitizers also contain the following:

squalyl > pourtant, on trouve des vidéos de gens qui montrent que ça brûle :