erickafalves
Forum Replies Created
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Thank you Belassi! -
thank you all for the recommendations.
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Hi Belassi,
this is the EDTA I am having a issue dissolving. you will see that in the SDS the it is insoluble in water, then the vendor said that the SDS is incorrect that it is soluble.
i am confused by it.
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Thank you @MarkBroussard and @Max.
So far i n my search, Microquality is the cheapest option.
Regards -
Excellent suggestion Belassi.
Thank you. -
What kind of solvent are you using? PMMA “absorbs” some solvents and the beads swollen and clump i as big aggregates. Look the SDS sheet of your MMA beads to verify the solubility in different solvents. Some solvents completely dissolves the polymer but if you want the beads to keep the shape, you need to add a solvent and quantity that will swollen and soften the beads without creating a big clump.
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Fragrance is composed with so many ingredients with very different chemical structures. You definitely need some surfactant and some type of solubilizer to emulsifier your mixture. Polysorbate 20 or 80 works relatively well with fragrances. The amounts you have to try and see what is best for your product.
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@Perry
Thank you very much. I am kind of stunned by these prices! -
@Belassi,
It might be a “horrible” preservative when you are using it in cosmetic. However, I am not. That’s not the intent for this product.
If you actually have some direct information regarding my question about cost I would appreciate that. Thank you. -
It depends on how clear do you need your formula to be and the VOC content allowed. For ~1% fragrance, I have used from 3.5% to up to 9% PEG-40 HCO and Polysorbate-20 (combined). And the ethanol content was ~2%.
I would recommend you to try Ternary Phase Diagram to find the optimum amounts of solubilizers, fragrance and surfactants. -
Thank you ozgirl and Perry!
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Hi Evchem, thank you for your response.
In fact, these two samples present some fragrance note change. Some change is always expected in aged samples, but some sour, vinegary notes that these fragrances presented after 3 months in the oven are not acceptable. It is very interesting that this small variation in pH affects the fragrance note.
I need to improve this formula in order to get rid off these changes. -
I also use PEG 40 Hydrogenated Castor Oil and Polysorbate 20 in a water/ethanol blend. It works well for me, however I never used ciclomethicone in it.
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Similar situation happened to be, but in our case, we identified the issue in the pilot run rather than full production.
What helped me to figure out the problem was doing a root cause analysis.
The root cause in my case was the emulsion instability. It was separating but we didn’t catch in the lab tests prior pilot tests for a simple silly reason: In the lab tests (stability tests) the cans were shaken before sprayed, so the emulsion was back to one phase, while in the compatibility tests (after pilot run) the samples were not shaken before sprayed.
So, the root cause analyses pointed this out and we were able to confirm it.
I would try the same thing. -
You overpowered the detection limit of the fragrance oil ingredients with this high alcohol content.
I would reduce the alcohol content (replace it by water) and if some separation occur, I would add more surfactant. Or I would try to displace some alcohol with Fragrance (up to 5%). -
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Have you done any compatibility testing between your formula and the plastic bottle? Have you tested under freezer, oven and room temp. conditions? If yes, has any of your materials and formula changed from the compatibility tests to the actual production run?
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Thank you DAS and ChemicalPyros.
I appreciate your help. -
Hi Perry,
Aerosol formulation and Formulating with fragrance oil are good topics for Webinars in my opinion!
thanks for your work. I really appreciate it.
