Stearic acid is a great bar hardener, and I like to use as both a bar hardener and emollient in my body and foot scrub bars. Let's take a look at the body scrub bar today and the foot scrub bar on Monday.
What do I want in a body scrub bar" I want something that contains physical exfoliants that will exfoliate my skin and leave it feeling moisturized.
The first thing we want to think about is the butter you're using. Normally I use butters like cocoa butter, mango butter, or kokum butter to harden the bar, but I can substitut a little stearic acid in the mix to help as well. Stearic acid is not only less expensive than any butter you can find, but it's also a nice emollient. I think I'll use it at 10% in this recipe to make a really hard bar.
The down side of using so much stearic acid is that it can be a bit draggy on your skin, so consider using a greasier butter like shea butter or coconut oil as the secondary butter in this bar.
Do not use coconut oil as the primary butter in this bar as it will be very soft and fall apart in slightly warmer temperatures!
For oils in this recipe, I definitely encourage you to use a liquid oil that will offer some greasiness. We want to get some glide and slip to this product! I generally use soy bean oil here as it has a nice long shelf life and offers all kinds of emolliency and phytosterols. You can use anything you want as an oil, but I do encourage you to use something inexpensive as it's not on our skin very long and we aren't getting all the benefits from the oil when it's being rinsed off.
I make mine emulsified so they will rinse cleaner than using all oils, so I definitely want something like Incroquat BTMS-50 or Polawax in the recipe to make sure it emulsifies well. You can use any emulsifier you like here.
Before you ask, yes, you can use any emulsifier you want. If it's an emulsifier, you can use it here. I suggest these ones as they tend to be less expensive and more readily available than s...