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Hello guys,
Could you help me out with these questions from the results of stability conducted by our partners for a baby shampoo:
1. What is the range of pH recommended for baby care products in particular with baby shampoos?
2. Through time it was declared by at low temperature (4-10 C) storage test the shampoo slowly thickened, what does this mean? or what could have contributed to the thickening? will it still be acceptable to stay through time it may not pose a problem to the product?
3. At temperature storage of 45 and 50 C through time the product becomes turbid, what could have caused the problem?
Thank you very much! Hope you may answer my inquiries.
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1) As the product has a high risk of entering an eye, I'd say around pH7
2) I'm assuming that the viscosity went up and the product became more difficult to pour. For a low temperature test, how was the product measured. Was it removed from the fridge and allowed to stabilise at "Normal temperature" before measuring? As a general rule surfactant products will often thicken up as they are cooled down, so temperature control during viscosity measurement is important so that you don't get misleading results. If your sample was measured at the exact same temperature each time, it may just be a characteristic of your formulation. The question is how much has it changed by, and does it effect the use of the product?
If the product is (say) 3000centipoise in viscosity, and the change is say +500 centipoise, that is getting within the limits of accuracy of the measuring device, and won't change the dispensing and flow out of the pack. If the viscosity has say shot up to 30000 centipoise, (exaggerated for effect) you may have problems getting it out of the pack.
3) Something is possibly reacting in there and may be hinting that there is a potential issue, depending on how long it has taken to show up. If its a week and 45-50C, that needs looking at, if its only showing up after 6 months, it may not be a problem in the market
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