Alum Powder for Deodorants

Regarding your question about whether Aluminum Sulfate powder is the only type of alum used for deodorizing in deodorant products, the answer is no.

"Alum" (สารส้ม) is a general term that refers to a group of chemical compounds, typically hydrated double sulfates of aluminum and another element.

While Aluminum Sulfate (Octadecahydrate) is one type of alum salt and can be used in some formulations due to its astringent properties, the most common type traditionally used as a natural deodorant is Potassium Aluminum Sulfate (often called Potassium Alum or just Potassium Sulfate).

Both types work by acting as astringents, which can help reduce sweat and inhibit the growth of odor-causing bacteria on the skin surface. However, they are chemically different.

Therefore, Aluminum Sulfate is a type of alum that can be used, but it is not the only type, and Potassium Aluminum Sulfate is more widely recognized and used as a traditional deodorant ingredient.