What is INFRAVEIL™ IT-100?

Infraveil ™ IT-100, an effective solution against skin aging caused by infrared rays, offers protection to skin. Acting as a physical barrier on the skin, it provides immediate protection against Infrared-A (IRA) rays. Infraveil™ IT-100, with its patented dispersion technology, leaves minimal whiteness on the skin despite its large particle size.

Particle and Dispersion Design

In designing a system that acts as a physical barrier to protect skin from harmful IRA rays, determining the optimal particle size that will provide IRA protection is of great importance. Robb et al. investigated TiO2 particles using a computer program called 'Mie Theory'. 1 According to Mie theory, as particle size increases, scattering of rays with longer wavelengths becomes possible. Based on this theory, UV light is optimally scattered with TiO2 particles of approximately 150nm particle size, while visible light is scattered with particles of 250nm diameter. Croda used this theory to determine the optimum particle size for Infraveil IT-100. As shown in Figure 1, a particle size of approximately 1000nm is the most suitable size for scattering IRA rays. 1 Robb, J.L.; Simpson L.A.; Tunstall, D.F., Titanium dioxide and UV radiation. Drug Cosmet. Ind. 1994, 154, 32-39 Croda has applied its expertise in Solaveil™ products to the design of Infraveil™ IT-100 dispersion. By controlling particle size distribution, it is possible to minimize particles that scatter rays in the visible range. The technology used by Croda carries the performance of optimized particles to the final formulation. Croda's patented dispersion technology used in the production of Infraveil™ IT-100 maximizes product performance while leaving no unwanted whiteness on the skin.

Appearance on Skin

Infraveil™ IT-100 leaves minimal whiteness on skin despite its large particle size when compared to Solaveil™ XT-100. Infraveil™ IT-100 was also compared with a pigment-grade TiO2 with large particle size. A prototype formulation containing 5% active TiO2 was applied at a level of 1.3 mg/m2 on different skin types. After applying the formulation, each participant was asked to rub the sample into their skin. Images of the skin surface were taken after 5 minutes. The results of the products on the skin are shown in Figure 2 on different skin types. Figure 2: Appearance of prototype formulation containing 5% active TiO2 on skin; comparison of pigment-grade TiO2 with Infraveil IT-100.

Independent Study

An independent test was conducted to verify the IR protection effect of Infraveil™ IT-100. At HelioScreen Laboratories in France, an in-vitro method was developed to substantiate the IR protection claims of the products. Accordingly, the criteria shown in Table 1 must be met for IR protection claims. The % IRA and % IRB shown in the table indicate the percentage of IR radiation blocked by the product. IRA-CW and IRB-CW represent the critical wavelength, or the balance between UV, visible and IR rays. In this study, 5% of each active was added; a total of 3 different formulations were compared: a formulation containing only Infraveil™ IT-100, a formulation containing only UV filters (Solaveil Spextra and Claurus), and a formulation in which UV filters and Infraveil IT-100 were together present. As a result of this independent study, it was demonstrated that formulations containing Infraveil™ IT-100 provide protection against IR rays. A formulation containing only UV filter was insufficient to meet the IR protection criterion. However, if Infraveil™ IT-100 is added to these formulations, IR protection can be achieved. Sena Yegin Sales Representative Croda Kimya Tic. Ltd. Şti.