Steartrimonium Chloride
AKA “112-03-8, Trimethylstearylammonium chloride, Stac, Cation AB, Aliquat 7, Stearyltrimethylammonium chloride, Nissan cation AB, Quaternium-10, Arquad 18, Stearyl trimethyl ammonium chloride”
Preservative
Ingredient Facts
Steartrimonium chloride
AKA: 112-03-8, Trimethylstearylammonium chloride, Stac, Cation AB, Aliquat 7, Stearyltrimethylammonium chloride, Nissan cation AB, Quaternium-10, Arquad 18, Stearyl trimethyl ammonium chloride
Preservative · Preservative · EWG: 7
Plant-Derived
Preservative
Skin Conditioner
Hair Care
Plant Oil
Not Clean
Trimethyloctadecylammonium chloride
Formula
C21H46ClN
Mol. Weight
348.00
CAS #
112-03-8
Form
Liquid
See origin →
Functions
Antistatic
Hair Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Preservative
Keeps your product from growing bacteria, mold, or yeast. Without these, that jar of cream becomes a petri dish in about a week.
Reduces Static
Conditions Hair
Preserves Formula
Reduces flyaways
Softens and detangles hair
Prevents microbial growth
Traditional Use
Synthesized as a quaternary ammonium salt in mid-20th century cosmetic chemistry. Developed as a cationic conditioning agent for hair and skin products to improve texture and manageability.
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
Final Report on the Safety Assessment of Cetrimonium Chloride, Cetrimonium Bromide, and Steartrimonium Chloride
Cosmetic Ingredient Review (CIR) Expert Panel
International Journal of Toxicology
Final Report on the Safety Assessment of Polyquaternium-10
Cosmetic Ingredient Review (CIR) Expert Panel
International Journal of Toxicology
Hydrogenated Pistachio Seed Oil
European Commission
EU Cosmetic Ingredient Database (CosIng)
Nardostachys Jatamansi Rhizome/Root Extract
European Commission
EU Cosmetic Ingredient Database (CosIng)
Pistacia Lentiscus (Mastic) Gum
European Commission
EU Cosmetic Ingredient Database (CosIng)
Pistacia Vera Seed Oil
European Commission
EU Cosmetic Ingredient Database (CosIng)
Polyquaternium-10
European Commission
EU Cosmetic Ingredient Database (CosIng)
Polyquaternium-10/Phosphorylcholine Glycol Acrylate Copolymer
European Commission
EU Cosmetic Ingredient Database (CosIng)
Steartrimonium Chloride
European Commission
EU Cosmetic Ingredient Database (CosIng)
Nardostachys Jatamansi Rhizome/Root Extract
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
Pistacia Lentiscus (Mastic) Gum
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
Polyquaternium-10
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
Steartrimonium Chloride
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
Ion-induced stacking of photosensitizer molecules can remarkably affect the luminescence detection of singlet oxygen in Candida albicans cells.
Felgenträger A, Gonzales FP, Maisch T, Bäumler W
Journal of biomedical optics, 2013
Traditional uses, phytochemistry and pharmacology of Chios mastic gum (Pistacia lentiscus var. Chia, Anacardiaceae): A review.
Pachi VK, Mikropoulou EV, Gkiouvetidis P, Siafakas K, Argyropoulou A et al.
Journal of ethnopharmacology, 2020
Adsorption isotherms of Polyquaternium-10 polymers by activated sludge solids.
Ponizovsky A, Schaefer E, Stanton K, Heisler R
Chemosphere, 2022
Development of a Definition of Postacute Sequelae of SARS-CoV-2 Infection.
Thaweethai T, Jolley SE, Karlson EW, Levitan EB, Levy B et al.
JAMA, 2023
Development of a Definition of Postacute Sequelae of SARS-CoV-2 Infection.
Thaweethai T, Jolley SE, Karlson EW, Levitan EB, Levy B et al.
JAMA, 2023
Development of a Definition of Postacute Sequelae of SARS-CoV-2 Infection.
Thaweethai T, Jolley SE, Karlson EW, Levitan EB, Levy B et al.
JAMA, 2023
Development of a Definition of Postacute Sequelae of SARS-CoV-2 Infection.
Thaweethai T, Jolley SE, Karlson EW, Levitan EB, Levy B et al.
JAMA, 2023
Development of a Definition of Postacute Sequelae of SARS-CoV-2 Infection.
Thaweethai T, Jolley SE, Karlson EW, Levitan EB, Levy B et al.
JAMA, 2023
Development of a Definition of Postacute Sequelae of SARS-CoV-2 Infection.
Thaweethai T, Jolley SE, Karlson EW, Levitan EB, Levy B et al.
JAMA, 2023
Development of a Definition of Postacute Sequelae of SARS-CoV-2 Infection.
Thaweethai T, Jolley SE, Karlson EW, Levitan EB, Levy B et al.
JAMA, 2023
Development of a Definition of Postacute Sequelae of SARS-CoV-2 Infection.
Thaweethai T, Jolley SE, Karlson EW, Levitan EB, Levy B et al.
JAMA, 2023
Development of a Definition of Postacute Sequelae of SARS-CoV-2 Infection.
Thaweethai T, Jolley SE, Karlson EW, Levitan EB, Levy B et al.
JAMA, 2023
Development of a Definition of Postacute Sequelae of SARS-CoV-2 Infection.
Thaweethai T, Jolley SE, Karlson EW, Levitan EB, Levy B et al.
JAMA, 2023
Development of a Definition of Postacute Sequelae of SARS-CoV-2 Infection.
Thaweethai T, Jolley SE, Karlson EW, Levitan EB, Levy B et al.
JAMA, 2023
Development of a Definition of Postacute Sequelae of SARS-CoV-2 Infection.
Thaweethai T, Jolley SE, Karlson EW, Levitan EB, Levy B et al.
JAMA, 2023
Development of a Definition of Postacute Sequelae of SARS-CoV-2 Infection.
Thaweethai T, Jolley SE, Karlson EW, Levitan EB, Levy B et al.
JAMA, 2023
Verified Jun 2026 · 🧪 = conflict
Data: PubChem · CosIng · EWG · CIR