NOTE: We describe how to make a hand sanitiser based on the WHO formula 2 described in this article: WHO Recommended Handrub Formulations. You can see another formulation here: Formula 1 Hand Sanitiser.
According to the WHO, alcohol-based hand sanitisers are the only hand sanitisers that work effectively and quickly against potentially harmful micro-organisms on the hands.
MATERIALS:
- Isopropyl Alcohol 99,8%. It is a colourless, flammable alcohol, with an intense odour and very miscible with water. Its chemical formula is C3H8O, as opposed to C2H5OH formula of ethanol (normal pharmacy alcohol). You can find it at Alquera.
- Hydrogen Peroxide 3%. The hydrogen peroxide you can find in pharmacies/supermarkets.
- Glycerine 98%. You can find it at Amazon or in Alquera.
- Canister (sterilised in boiling water)
QUANTITIES TO BE MIXED FOR 1 LITRE OF DISINFECTANT
- 751 ml Isopropyl Alcohol 99,8%
- 42ml of Hydrogen Peroxide 3%
- 15ml of de Vegetable Glycerin.
WHAT ROLE DOES EACH COMPONENT PLAY?
The role of each component is the same, whether you choose the formula 1 or this formula 2 (the information shown is a translation of this WHO document): WHO Recommended Handrub Formulations
ALCOHOL:
Alcohol-based hand sanitisers are currently the only hand sanitisers that work effectively to inactivate a broad spectrum of harmful microorganisms. They are inexpensive and can be easily brought to the point of application.
HYDROGEN PEROXIDE 3%.
The small concentration of hydrogen peroxide in the formula is to remove contaminated spores in the solution. It is not an active component on the hands.
VEGETABLE GLYCERIN
Glycerine is used as a humectant and moisturiser. Maintaining the % of glycerine is important as it increases the stickiness of the active component alcohol on the hands.
OTHER INGREDIENTS
It is better not to add fragrances and other components in this formula.