Water-in-Oil Emulsifiers and Sunscreen Solubility

Regarding your questions:

Water-in-Oil Emulsifiers for High Oil Phase (50-60%)

It is generally not possible to achieve a stable Water-in-Oil emulsion with an oil phase as high as 50-60% using only a standard Water-in-Oil emulsifier. Such high oil concentrations typically require the use of a stabilizer.

Oil-Fix™ W (Silica Dimethyl Silylate) is a suitable stabilizer designed to increase the stability of Water-in-Oil formulas, allowing for higher oil levels than can be achieved with emulsifiers alone. It works by encapsulating water molecules within the oil phase and forming a network around oil molecules, helping to prevent separation.

BEMT Solubility in LipidSoft

The statement that BEMT dissolves up to 12% in LipidSoft refers to the standard type of LipidSoft. The solubility of BEMT can vary significantly depending on the specific type of LipidSoft used.

For other types of LipidSoft, such as LipidSoft™ SPF or LipidSoft™ B, the maximum dissolution percentage for BEMT may be different. It is recommended to perform solubility testing for BEMT in each specific type of LipidSoft you plan to use to determine the maximum concentration that can be dissolved.