Dry Feeling vs. Volatile Silicone

Dec 3, 2008 | Contact Author | By: Anthony J. O'Lenick, Jr., Siltech LLC
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Title: Dry Feeling vs. Volatile Silicone
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A number of applications require having a dry feel to them. The feel of a formulation often has been associated with volatility. Volatility is the ability of the compound to evaporate under the temperatures at which it is used in formulation.

For cosmetic products, this temperature is ambient. D4 evaporates at room temperature by about 50% in 7.5 hr but D5 is much less volatile, showing a loss of only about 4.5% in 7.5 hr. D5 provides a dry feel but is not appreciably volatile at use temperatures.

Several other silicones were evaluated at ambient temperatures, as are shown in Table 1 and Figure 1.

 

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Table 1. Volatility at 20°C

Table 1: Volatility at 20°C
D4 evaporates at RT by about 50% in 7.5 hrs. D5 is much less volatile, showing a loss of only about 4.5% in 7.5 hrs. D5 provides a dry feel but is not appreciably volatile at use temperatures.

Figure 1: Volatility at 20°C

Figure 1: Volatility at 20°C
Several silicones were evaluated at ambient temperatures and are shown in Figure 1.

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