Specialty silica gels improve the aesthetics of mineral-based sunscreens

Specialty silica gels improve the aesthetics of mineral-based sunscreens

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Water-in-oil (w/o) sunscreen has always been an industry challenge as getting the SPF required with minerals has led to a greasy, unattractive product. AGC and its affiliates act resolution These have been successful in creating effective mineral formulas without beauty problems. Adding SOLESPHERE The porous and non-porous silica gels for the formulation make it possible to produce sunscreens and makeup with both high SPF and consumer appeal.

Newly tested formulations made from porous and non-porous silica gels achieve a high-SPF sunscreen (In Vitro 70+) with UVA/UVB sun protection as well as moisturizing and skin-conditioning characteristics. These W/O formulations are more competitive with oil-in-water (O/W) products.

Formulation Challenges of Mineral Activities

W/o formulations provide effective UV protection using natural mineral actives such as Zinc Oxide. Minerals are more environmentally friendly and safe for humans. Zinc oxide nanoparticles, being a natural broad spectrum UV filter, have become an ideal ingredient in sun care products. For example, according to BASFIn the past five years, 90% of sun care products launched in North America were made using zinc oxide nanoparticles. In fact, data showed that the use of zinc oxide as a UV filter increased 20% between 2017 and 2018, while new sunscreen launches containing all-chemical UV filters have been declining since 2014.

Despite the safety benefits, these products have been unpopular among customers because they feel greasy and thin when applied and leave a white coating on the surface of the skin that is difficult to rub off. While some customers accept it for sunscreen, almost no one accepts it. For daily skin care products.

Besides the aesthetic issues, w/o formulations are more time consuming and difficult to manufacture than o/w formulations. Incorporating beeswax further exacerbates this problem because they require processing at high temperatures.

Silica Gel: An Ideal Sunscreen Ingredient

Recent advances in silica gel technology have answered all of the above challenges. solacephere microspherical silica gels Made from silicon dioxide, a natural, durable material.

While silica gels w/o sunscreen formulations do not naturally provide sun protection, they do boost SPF, allowing the lower mineral content to be used in formulations. Their pores are also excellent at scattering light. As UV light passes through the product’s film on the skin, the porosity of the silica gel increases its path-length and causes the light to scatter in all directions.

Formulations made with silica gel also create a thicker and more uniform film on the skin. These two factors increase the SPF of inorganic sunscreens by up to 200%. Additionally, silica gels absorb oil and sebum, reducing their greasy and slimy feeling. SOLESPHERE Gels are ideal replacements for traditional SPF boosters like waxes and microbeads.

porous silica gel

Porous microspherical gels with a particle size of 3 µm have a diameter of 700 m. It happens2/g surface area, which is greater than that of most microbeads. They also do not deform like plastic beads.

Testing has shown that adding only 2% spherical silica gels to a W/O emulsion sunscreen will alter the aesthetics enough to rival any O/W emulsion.

This test also showed that these characteristics provide maximum light scattering:

  • 3,000 nm. mean particle size of
  • Specific surface area of ​​700 square meters2/Yes
  • 2 mL/g. pore volume of
  • 11 nm. pore diameter of

non-porous silica gels

Nonporous silica gels don’t scatter light, which means they provide no SPF boost when used alone or with the active ingredient in inorganic sunscreen formulas. However, when they are combined in a formulation with porous silica gels, they boost the SPF because they improve the spread of sunscreen actives.

Testing showed that adding 2% aqueous non-porous gels with an average particle size of 10,000 nm and a specific surface area of ​​50 m2For an inorganic sunscreen system the /g boosts the SPF up to 75%.

successful test formula

Below are test formulas that demonstrate the effects of adding porous and non-porous silica gels:

ACT 23095 Coconut Care SPF+ – High-SPF (in vitro 70+) UVA/UVB sun protection with moisturizing and skin-conditioning features.

  • In vitro SPF 72, critical wavelength 372.4 nm
  • In Vitro SPF 19.9 Without Silica Gels
  • 18% Zinc Oxide
  • no whitening
  • Moisturizing but not greasy
  • Leaves skin with a “fuller” appearance
  • Ideal for face and body
  • W/O structure provides built-in water resistance
  • 2% Porous Silica Gels, 2% Non-porous Silica Gels

22514 Shade Perfect – A hydrating, non greasy tinted sunscreen with 50+ SPF.

  • Contains only 9% (UVA-attenuating) titanium dioxide and 3.75% iron oxide
  • In Vitro SPF > 50
  • Provides enhanced UVA protection (age, discoloration, cancer) with a significant 386 nm. wavelength of
  • Hydrating, Nongreasy Formula
  • designed for dark
  • Lightly tinted, no whitening on the skin
  • 2% Porous Silica Gels, 2% Non-porous Silica Gels

It will continue to be difficult to produce w/o products that use mineral active substances. However, these products can compete with O/W products and gain consumer acceptance when aesthetics and stability are improved. This improvement can be achieved by using porous and non-porous silica gels.

Find out more about SOLESPHERE Microsphere Silica Gel Test Formulation Here,

To learn more about our fine silica for the manufacture of cosmetics, Contact AGC Representative,

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