I need help with my lotion recipe. I've reformulated and reformulated and it comes out great initially but separates after approx 1 week. Here is my recipe:
7% e-wax
3% stearic acid
15% butters
10% oil
60% aloe vera juice
2% glycerin
1% optiphen
1% fragrance oil
(Percentages may be slightly off, I just rounded but they are approx). I heat the oils/butters and liquids and combine while hot (approx 135f), blend with immersion blender until creamy. Wait till approx 85 degrees f to add optiphen and FO (I thought that may be the cause of separation in prior recipes because when added between 90-120 degrees f as recommended the emulsion would separate as soon as it hit 80-85 degrees). This time it did not separate and stayed a beautiful, creamy texture for approx 1 week and then separated into a curdled oily mess. Any advice on what's causing this? I'm at a total loss now, I think the proportions are ok and the temps should be ok as well. =( Help!