Aluminium Sesquichlorohydrate – an Aluminium Salt

Aluminium Sesquichlorohydrate – an Aluminium Salt

Aluminium sesquichlorohydrate is a salt of aluminum that is used as an antiperspirant, deodorant, and cosmetic astringent. It is a complex of aluminium, chlorine, and water, with the chemical formula Al2Cl(OH)5. Aluminum sesquichlorohydrate blocks eccrine sweat glands physically. It is commonly used as an active ingredient in antiperspirants and deodorants because of its ability to control sweat and odor.

Aluminium Sesquichlorohydrate works by reacting with the electrolytes in sweat to form a gel-like plug in the sweat ducts, which reduces the flow of sweat to the skin’s surface. This helps to keep the underarms dry and prevent the growth of odor-causing bacteria.


Aluminium Sesquichlorohydrate works by forming a gel-like plug in the sweat glands, thereby reducing the amount of sweat produced. It also has deodorizing properties due to its ability to inhibit the growth of bacteria that cause body odor.

  • Chemical formula: Al2Cl(OH)5
  • Appearance: It is a colorless or pale yellow liquid with a slightly acidic odor.
  • Solubility: It is highly soluble in water and ethanol.
  • Stability: It is stable under normal conditions of use and storage.
  • pH value: It has a pH value of about 4.0-5.0, which is slightly acidic.


The use of aluminium sesquichlorohydrate in antiperspirants is considered safe by the US Food and Drug Administration, and it is permitted in concentrations up to 25%.

Aluminium sesquichlorohydrate (ASH) is a common ingredient used in antiperspirants and deodorants due to its ability to reduce sweat and odor. ASH works by forming a gel-like plug in the sweat ducts, which reduces the amount of sweat that can be released from the sweat glands.

ASH is also used in water treatment and purification processes as a coagulant, helping to remove impurities and particles from water. It is also used in the production of paper, textiles, and leather as a tanning agent. In addition, ASH has some pharmaceutical applications, such as in the treatment of hyperhidrosis (excessive sweating) and in the formulation of topical antimicrobial agents.

Concern Issues

It is important to note that ASH can cause skin irritation and allergies in some individuals, and its safety and efficacy are regulated by various governmental bodies. It is always recommended to use products containing ASH according to their intended use and in accordance with instructions provided by the manufacturer.

However, there have been concerns raised about the potential health risks associated with the use of aluminium-based antiperspirants. Some studies have suggested that regular use of these products may be linked to an increased risk of breast cancer and Alzheimer’s disease, although the evidence is not conclusive.