How would you compose a SPF >=30 Spray-on mineral based sunscreen? Si/W Suggestion inside!

ZinkZink Member
edited August 2015 in Formulating
First off would you do a O/W, W/O, Si/W, W/Si or an anhydrous Oil based formula? I've made a suggestion for a Si/W based formula below, leaving out methodology for now.

Percentages and composition are theoretical guesstimates at this stage and will certainly need changes to ensure proper sprayability, spreadability, skin feel and dispersion of the minerals w/o sedimentation.

10% Zinc Oxide (silicone coated) - Broad spectrum sunscreen
6% Titanium Dioxide (silicone coated) - Primarily UVA sunscreen
10% Cyclopentasiloxane - Light silicone for waterproofing, lubrication, dispersant
5% Dimethicone (and) Dimethicone/Vinyl Dimethicone Crosspolymer - thickener, water repellant
5% Dimethicone /PEG-10/15 Crosspolymer - Water/Silicone emulsifier
3% Propylene Glycol - Freeze protection
1%  Phenoxyethanol (and) Caprylyl Glycol (and) Sorbic Acid - Preservative
q.s Water

Thoughts or ideas?


  • ZinkZink Member
    To clarify further, what I'm looking for is a minimal good-bet starting point.
  • ZinkZink Member
    i'd be open to pay for consulting on this formula.
  • MicroformulationMicroformulation Member, Professional Chemist
    Your SPF/Spectrum Testing alone is going to be in the range of about $5K plus. I received one estimate this week for $6500 for the full service. Microformulation Cosmetic Consulting provides Custom Formulations for both large Commercial accounts as well as smaller entrepreneurs. We can provide Naturally compliant Formulations under the NSF, NPA, Whole Foods and USDA Organic Certifications. BS.Pharm Albany College of Pharmacy, Union University.
  • ZinkZink Member
    edited August 2015
    Thanks for the information. Before getting to that point I'm interested to see if the formula is at all possible, if it is, passes accelerated stability and it looks promising, SPF testing cost will not be a problem.
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