14 September 2008

Different skin types will require the use of different sunscreens. There must be adequate test done on various skin types to determine the optimal blend of sunscreens to be used for all skin types.

Foundation
Ingredients% Weight
Waterqs
Iron oxides2
Titanium dioxide5
Magnesium Oxide1.5
Zirconium Oxide2.5
Zinc Oxide5.5
Talc4.5
Titanium Dioxide8
Stearic acid4
Propylene glycol monostearate2.5
Lanolin alcohols1.5
Sorbitan sesquioleate0.72
Preservatives0.3
Isopropyl myristate7
Sodium carboxymethyl cellulose0.15
Triethanolamine1.5

This formula had a great spreadability and can be prepared very easily. But there is a problem. The use of titanium dioxide, magnesium oxide, zirconium oxide, zinc oxide, and talc will produce ashiness on dark skin types. There is a solve for such problems. Use this next formula.

Foundation
Ingredients% Weight
Waterqs
Nanofine red Iron oxides2
Micronized Titanium dioxide14
Silica1.5
Lithium stearate2.5
Mica5
Isostearic acid1
Stearic acid3
Propylene glycol monostearate3
Lanolin alcohols2
Sorbitan sesquioleate0.72
Preservatives0.3
Isopropyl myristate7
Sodium carboxymethyl cellulose0.15
Triethanolamine1.5

FoundationUsing formula like this for sunscreen product, the chalkiness or ashiness is gone; using a translucent mica, titanium dioxide, and iron oxides. To helps the powder adhere to the skin use lithium stearate. The SPF of approximately 17 is achieved by the use of the microfinescreen is advantageous in that it has a high phorostability profile. The downside can be its hydrophobic effect, which may be unstable for the length f a drug stability protocol.

Combining a metaloxide flake and an ultraviolet absorbent-encapsulated polymer resin enhanced SPF efficacy, and also required smaller amounts of both components in formulations. Example of the polymer resins include vinylpolymers, acrylic resins, polystyrenes, and some others. The UV resins include salicylic acid, benzophenone derivates, and aminobenzoic acid derivates. The metal oxides include zinc oxide, titanium dioxides, and zirconium oxides.

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