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Deodarant stick filling/formulation suggestions
We are going to be formulating cosmetic cream type products but in a deodorant stick type base. Customer wants several hard stick products with with different “active” such as peptides etc.. I figured a deodorant stick base would be good since it allows for water. I am thinking of basically
Sodium stearate about 7%
PEG 400 Monolaurate 2%
Propylene Glycol about 50%
Water soluble activesI am looking for suggestions on manufacturing process or filling tips since this is a new area for us.
Thanks
David -
7 Replies
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from a production perspective, sticks are no different to other hot-fill products; the only real difference is the packaging is more complex than the simple jars or tubs used in typical hot-fills
as the dispenser has a mechanism inside, you’ll need to do pack functionality tests alongside your usual stability tests to ensure your product remains dispensable and easy to use throughout its shelf life
as far as formulation goes, hydrogenated castor oil and carnauba wax are good if you want to give the product a hard consistency - the only potential drawback, depending on your process capabilities, is you need to heat them to 80-90°C to melt them
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David,
Filling a water-based stick product requires very careful control/minimization of product evaporation, to the point where scrap material probably can’t be re-worked.There are two (maybe three) types of containers you can fill into:1) Direct-fill push up2) Direct-fill propel/repelmaybe 3) Pre-molded fill propel/repel (lipstick-type) More expensive, more equipment needed, harder to assemble - just mentioned for completeness.Particularly with the direct fill push-up containers, you need to have a formula that will shrink enough away from the container walls so that it’s relatively easy to push up the product. Propel/repel containers let you overcome a little more friction, but not much.Having a formula that shrinks, though, means that you will have to decide how to deal with the shrinkage cavity/shrinkage funnel that will inevitably develop. You might be able to avoid this by filling from the back.Picture: -
Thanks guys. Do you think the Sodium stearate by itself is going to give me a solid stick formula?
The link (if I did it correctly) will show the type of stick I have to use. It contains a wax product we filled for the customer but now they want a water based stick to put peptides into. We fill it from the back open end.
http://www.smugmug.com/gallery/37781404_zvSnCD#!i=3129556448&k=jpsvzP3
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Sodium Stearate can give you a stick structure all by itself. An aesthetically pleasing stick? Not so much.
This should be useful:David, do you folks make anything similar to “heel-tastic”? -
Global 4075 from Stepan thickens with the addition of Na Stearate. Pretty easy to use and lots of Formulation guidance.
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Thank you guys.
@bobzchemist yes we do. Do you need me to send you some
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@microformulation Global Seven info says it is for anhydrous formulations. I have a local Global Seven distributor.
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