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I tested the combination of HEC and sodium polyacrylate. It was a simple test to see what happens when I mix the two (disastrous or okay).

Multipolymer_Mix_HEC_and_Sodium_Polyacrylate

Multipolymer Mix HEC and Sodium Polyacrylate

Temperature 4.6 ℃, humidity 82%, early morning

The solution was made with the following recipe. (The amount is somewhat arbitrary)

・ 0.7g  Sodium Polyacrylate

・ 5.3g HEC (Natrosol 250HHR)

・ 1,000ml  hot water (Boiled)

・ 3,334ml tap water

・ 8.0g baking soda

・ 1.3g  citric acid

・ 240g  Cucute (Japanese detergent)

I added mixed powder of HEC and sodium polyacrylate to hot water 1,000ml little by little while stirring with a magnetic stirrer (and after that, I added baking soda). After stirring with a magnetic stirrer for about an hour, I saw some lumps (It was clearly due to sodium polyacrylate). I added tap water 3,334ml, citric acid and detergent to it, and let it sit overnight. Next morning, lumps had disappeared.

I went to river beach and tested it. The solution was friendly and it was easy to make a spherical bubble of 1.5-2.0 meters. It was difficult to make spherical bubbles larger than that, which may be due to the small size of the tri-string wands I like (it was easy to make floating tubes 5.0-6.0 meters).

As far as I can see, sodium polyacrylate has no problem mixing with HEC.