Sodium Shale Oil Sulfonate

What is Sodium Shale Oil Sulfonate?

Sodium Shale Oil Sulfonate is a semi-synthetic ingredient derived from shale oil, obtained through the distillation of bituminous shale rocks followed by sulfonation to create a water-soluble sodium salt. Chemically, it consists of complex mixtures of sulfonated aliphatic and aromatic hydrocarbons, functioning as an anionic surfactant. Primarily found in rinse-off hair care formulations like shampoos, it lowers surface tension to facilitate cleansing, emulsification, and foam formation. Additionally, its antimicrobial properties help limit microbial proliferation on the scalp and within the product, while its biocide action preserves formula integrity. In anti-dandruff products, it contributes to a balanced scalp environment by inhibiting fungi and bacteria often linked to flaking.

Comedogenic Rating 0/5 Low risk of clogging pores

EWG Safety Rating 1 View on EWG →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Biocide

Destroys or inhibits harmful organisms to preserve products.

Antidandruff agent

Helps reduce visible flaking and scalp discomfort by controlling the scalp environment (often via antifungal or keratolytic action) in shampoos and scalp treatments.

Antimicrobial agent

Helps limit growth of bacteria and other microbes on skin or in the formula; may be used for product protection, odor control, or targeted antimicrobial effects.

Surfactant

Lowers surface tension to enable cleansing, emulsifying, and foaming; central to shampoos, body washes, and many emulsions and micellar systems.

Benefits

Enables thorough yet gentle cleansing and rich lather in shampoos.

Supports product stability by controlling microbial growth.

Aids in maintaining a healthier scalp environment through antimicrobial effects.

Who It's For

A quick guide for who this ingredient may suit (and who should be cautious).

Who May Benefit	Who Should Avoid
Individuals with flaking or itchy scalps seeking supportive cleansing.	Those with known allergies to sulfonated compounds.
Users of anti-dandruff shampoos for daily hair washing.	Individuals experiencing irritation from shale oil derivatives.
People preferring multifunctional surfactants in rinse-off products.	People with highly sensitive scalps preferring minimal ingredient formulas.

Safety Notes

Generally regarded as safe for use in rinse-off cosmetics at typical concentrations.
Low comedogenic potential, unlikely to clog pores.

Frequently Asked Questions about Sodium Shale Oil Sulfonate

What is Sodium Shale Oil Sulfonate derived from?

It comes from sulfonated shale oil, produced by processing bituminous shale rocks.

What roles does it play in cosmetics?

It functions as a surfactant for cleansing and foaming, plus antimicrobial and biocide for preservation.

Is it suitable for sensitive scalps?

It shows low irritation potential but patch testing is advised for sensitivities.