Article last updated: October 15, 2024
Sodium Naphthol Sulfonate, also known as 1-Naphthalenesulfonic acid, 4-hydroxy-, monosodium salt, is a chemical compound primarily used in the cosmetic industry as an absorbent. This ingredient is derived from naphthalene, a hydrocarbon found in coal tar or crude oil. Chemically, it consists of a naphthalene ring bonded to a sulfonic acid group and a hydroxyl group, with a sodium ion balancing the charge.
The history of Sodium Naphthol Sulfonate in cosmetics dates back to the early 20th century when chemists began exploring the potential of naphthalene derivatives in various applications. Initially used in dyes and pigments, its absorbent properties were later discovered to be beneficial in cosmetic formulations. This led to its adoption in products designed to control oil and moisture levels on the skin.
The production of Sodium Naphthol Sulfonate involves sulfonating naphthol, a process where sulfuric acid is used to introduce the sulfonic acid group into the naphthalene structure. This is followed by neutralization with sodium hydroxide to form the monosodium salt. The result is a stable, water-soluble compound that can effectively absorb excess oils and moisture, making it a valuable ingredient in skincare and cosmetic products.
In this section, we will delve into the officially recognized cosmetic benefits and uses of Sodium Naphthol Sulfonate:
Sodium Naphthol Sulfonate is primarily recognized for its absorbent properties. In the realm of cosmetics, this means it has the ability to soak up excess moisture and oils from the skin. This can be particularly beneficial in products designed for oily or combination skin types, as it helps to maintain a matte finish and reduce the appearance of shine throughout the day. By controlling excess oil, it can also help in minimizing the likelihood of clogged pores and subsequent breakouts.
Note: the listed benefits above are exclusively based on the officially recognized and defined functions of the ingredient, as documented by the International Nomenclature of Cosmetic Ingredients (INCI).
Sodium Naphthol Sulfonate is generally considered safe for use in cosmetic products. However, as with any ingredient, there are potential side effects and considerations to keep in mind.
Regarding individuals who are pregnant or breastfeeding, data and research on the topical usage of Sodium Naphthol Sulfonate during pregnancy are lacking. Therefore, it is recommended that they consult a healthcare professional for further advice.
Side effects and adverse reactions from Sodium Naphthol Sulfonate are relatively uncommon. However, to minimize the risk of irritation or allergic reactions, it is advisable to conduct a patch test before widespread usage.
In terms of comedogenicity, Sodium Naphthol Sulfonate has a rating of 1 on a scale of 0 to 5, where 0 is totally non-comedogenic and 5 is highly comedogenic. This means it is unlikely to clog pores and is generally suitable for people prone to acne, blemishes, or breakouts.
