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Sorry, I was not clear enough… The products that I mentioned are actually dissolvable in water. The customer simply get a refill as a powder and mix it with tap water by their self. We have products in our portfolio for both foaming pumps and lotion pumps.
We realised the problem is actually not in the liquid perfume, but in some of the surfactants, which we buy as flakes and grind to powder. These surfactants perform well when the room temperature is around 20 degrees, but when it gets warmer the powder starts to get sticky.
I got some ideas to try with PEG-75 or another higher molecular weight PEG, but it gets even worse. I am wondering would Maltodextrin be a safe bet, since it’s not only known as anti-caking agent, but also as binding agent, which is honestly a bit confusing to me? I actually already tried with 0.8% and did not find any difference.
The only effective products for now seems to be 0.5-0.7% of Sipernat 22S or Aerosil 200, which are both Silica varieties but unfortunately non of them is water soluble.
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No ideas?
