Physical Sunscreens and Dispersion
I am wanting to make a “natural” (mineral) sunscreen formulation for my friends, most of whom lean toward the hippie side (can’t help it, I live in San Fran ). I’ve read several blog posts regarding the difficulty of formulating an effective physical/mineral sunscreen. Of course, if I decided to sell such product I would get SPF and other kinds of formal testing done. But is it true that using a regular handheld stick blender will not adequately disperse Zinc Oxide powder in a base, as suggested by the following blog post? If so, which homogenizer you would recommend buying to an entry level chemist for this purpose? I probably need one anyway for down the road. My typical batch sizes are currently quite small (anywhere from 3 to 14 oz or so).
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