• Formulating

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

  Posted by Zink on August 24, 2015 at 11:08 pm

  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?

  Zink replied 9 years, 2 months ago 2 Members · 4 Replies

  • mineral
  • spray
  • sunscreen
• 4 Replies

• 

  Zink

  Member

  August 25, 2015 at 2:29 am

  To clarify further, what I’m looking for is a minimal good-bet starting point.

• 

  Zink

  Member

  August 29, 2015 at 3:45 am

  i’d be open to pay for consulting on this formula.

• 

  Microformulation

  Member

  August 29, 2015 at 2:16 pm

  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.

• 

  Zink

  Member

  August 31, 2015 at 1:55 am

  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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