Hi fellow chemist, I have problem about making simple hand sanitizer. The texture of the gel, clarity, and aroma is good. However when I rub it on the hand, it forms micro foam which is not pleasant at all. Eventually when totally dries, the micro foam is gone, but still the micro foam is a problem.
Here is the formula:
To 100 Purified Water
0.2 Carbopol 980
0.2 Fragrance Oil
TEA (only 4 drops)
My method is to combine first the carbopol with water until it is transparent, then I add TEA to thicken it. Then I add the ethanol slowly until everything is mixed properly and turn to light gel consistenty. I add Fragrance oil in the last step.
Do you have any idea what cause the micro foam? I thought at first 60% ethanol is not enough, so I changed to 70% hoping that the foam will not form. But still at 70% the micro foam is very visible. My benchmark product has the same ingredients, although the composition may differ.
Thank you so much and hope to get your insight about this problem.