Hand Sanitizer Gel Became Cloudy and Liquid After Adding Too Much TEA

Question

May I ask a question?

I intended to make hand sanitizer gel to give away and have already started mixing it. After adding Carbopol and ethanol together,
I then added TEA at 30ml (production ratio 10,000 milliliters), but suddenly while adding TEA, the color of the liquid became cloudy and it turned out that it did not become a gel at all, but became liquid instead.

What is the cause of this?
And is there any way to fix it so it becomes a gel again and can be used?

Answer 1

Hand Sanitizer Gel Problem: Cloudy and Liquid After Adding TEA

It sounds like you've encountered a common issue when working with Carbopol gels and neutralizers like Triethanolamine (TEA). Here's an explanation of what likely happened and whether it can be fixed:

Cause of the Problem

Carbopol is a gelling agent that requires neutralization to thicken and form a gel. Triethanolamine (TEA) is used to raise the pH of the mixture, causing the Carbopol polymer chains to swell and create the gel structure.

However, adding too much Triethanolamine can lead to over-neutralization. When Carbopol is over-neutralized, the gel structure can break down, or the polymer may become less soluble at the very high pH. This results in the mixture becoming liquid and often cloudy, which is exactly what you observed.

Can it be Fixed?

Attempting to fix an over-neutralized Carbopol gel, especially in a large volume like 10,000 ml, is challenging and often unsuccessful.

The theoretical way to try and fix it would be to carefully lower the pH back into the optimal gelling range for Carbopol. This would involve adding a very dilute acidic solution (such as citric acid or lactic acid solution) very slowly and drop by drop while continuously mixing. The goal is to bring the pH down just enough for the Carbopol to re-gel without making it too acidic, which would also break the gel.

However, this method is difficult to control precisely in a large batch. There's a high risk of adding too much acid and making the situation worse, or simply not being able to recover the desired gel consistency and clarity.

Recommendation

The most reliable approach is to discard the current batch and start over. When preparing the new batch, add the Triethanolamine very slowly while mixing, monitoring the viscosity until the desired gel consistency is achieved. Avoid adding a large, predetermined amount all at once.

Products involved in your formulation include:

Carbomer (such as Carbomer U21, Carbomer U10, or Carbomer 980)
Ethyl Alcohol (such as Ethyl Alcohol 99.9% or Ethyl Alcohol 96%)
Triethanolamine 99%

By carefully controlling the neutralization step in your next attempt, you should be able to achieve a stable gel.

Answer 2

As of May 17, 2026, several modern ingredients are available that simplify the gel-making process and prevent the neutralization issues described above:

Sodium Carbomer (S-Carbomer): This is a pre-neutralized version of carbomer. It thickens instantly when added to water or hydroalcoholic solutions, completely eliminating the need for Triethanolamine (TEA) and the risk of over-neutralization.
CarboQuick: This is a pre-dispersed gel base. It allows you to create a clear gel by simply mixing it into your water phase, removing the complexity of dissolving powders and adjusting pH.
Carbomer U21: For formulations with high alcohol content (like hand sanitizers), this grade is superior to standard carbomers. It provides better clarity and is easier to disperse, though it still requires a neutralizer like Triethanolamine 99% or AMP to reach the optimal pH.