Emollients are almost always categorized as what type of agents?

Emollients are primarily classified as fatty agents because their main function is to moisturize and soften the skin. They typically contain lipids or fats, which are crucial for enhancing the skin's barrier function and preventing water loss. This lipid-rich composition allows emollients to create a protective layer on the skin, which not only hydrates but also soothes irritation and helps to maintain skin elasticity.

Fatty agents in emollients can include oils, butters, and waxes, which are known for their ability to provide lubrication and prevent dryness. These substances are effective in filling the gaps between skin cells, leading to a smoother and more pliable surface.

Other categories like water-soluble agents are not characteristic of emollients, as they tend to be more focused on hydration without the occlusive properties offered by fatty agents. Volatile agents, which evaporate quickly, do not provide the sustained moisturization that emollients do. Meanwhile, alcohol-based agents can often dehydrate the skin rather than provide the moisture that emollients are designed to deliver.