Sunday, November 7, 2010
Humectants: Dipropylene glycol & butylene glycol
Dipropylene glycol is used a lot in fragrance oils, and you might see suppliers listing their fragrances as DPG free. It's a great fragrance fixative, although fragrances with DPG can cloud and soften translucent soap bars, so if you're a melt & pour type girl like me, watch out when you're using a clear soap! (It's actually used in shaving bars to make them softer because that's a bonus for that product!) You will notice a difference in non-DPG fragrances - they tend to fade quicker than those with it - so you can extend the life of the scent by adding some DPG or C12-15 alkyl benzoate to your product.
You can use it at up to 50% in the heated water phase of your product, although you'll probably want to use it at 1% to 5% or so. It's a good option for deodorant bars as a gelling agent, and you can use it at up to 10% in that capacity.
You can use butylene glycol at up to 89% in the heated water phase of your product, but you'll probably want to keep it around 1% to 5%. You can use this as the gelling agent in deodorant bars, and you can use it at up to 10% in that capacity.
Join me tomorrow to take a look at mineral oil (insert dramatic chord here!).