PEG-6 caprylyl/caprate is a nonionic surfactant, widely utilized in the cosmetic industry for its emulsifying and solubilizing properties [1]. It represents a polyethylene glycol derivative, combined with caprylic and capric acids commonly sourced from coconut or palm kernel oil [2]. The “PEG-6” designation indicates that the polyethylene glycol portion of the molecule has an average molecular weight corresponding to approximately 6 repeating ethylene glycol units.

The production of PEG-6 caprylyl/caprate typically involves the esterification of polyethylene glycol with a mixture of caprylic and capric acids [3]. Caprylic and capric acids, which are saturated fatty acids, are first obtained through the hydrolysis of coconut or palm kernel oil. Subsequently, these fatty acids are reacted with polyethylene glycol under controlled conditions, often using a catalyst to facilitate the esterification process [4]. The resulting product is then refined to remove any unreacted materials and by-products, ensuring the purity and stability of the final ingredient.

PEG-6 caprylyl/caprate functions primarily as an emulsifier and solubilizer [5]. It aids in the incorporation of oil-based ingredients into water-based formulations, creating stable and homogenous mixtures. This is particularly useful in products where water and oil components need to be uniformly combined. Additionally, it enhances the solubility of certain ingredients, such as fragrances and essential oils, which may not readily dissolve in water [6]. Furthermore, it serves as a gentle cleansing agent, assisting in the removal of dirt and oil from the skin, making it suitable for use in facial cleansers and makeup removers [7].

PEG-6 caprylyl/caprate finds applications in various cosmetic and personal care products. It is commonly incorporated into facial cleansers, makeup removers, shampoos, and body washes [8]. Due to its mildness and effectiveness, it is often preferred in formulations designed for sensitive skin. Moreover, it can be found in lotions and creams, where it contributes to the texture and stability of the emulsion [9]. Its versatility makes it a valuable ingredient in both leave-on and rinse-off products.

PEG-6 caprylyl/caprate is typically packaged in plastic drums or containers, depending on the quantity [10]. Transportation should adhere to standard practices for non-hazardous materials. Storage should be in a cool, dry place, away from direct sunlight and extreme temperatures, to maintain its stability and prevent degradation [11]. The material should be kept in tightly sealed containers to avoid moisture absorption and contamination.

Citations:
[1] International Journal of Toxicology. (2012). Final Safety Assessment of PEG-6 Caprylic/Capric Glycerides and related ingredients. International Journal of Toxicology, 31(S3), 79S-94S.
[2] Römpp Online. (n.d.). Caprylic acid.
[3] Chemistry Europe. (2013). Enzymatic Synthesis of Sugar Esters and Polyol Fatty Acid Esters. Chemistry Europe.
[4] Kirk-Othmer Chemical Technology of Cosmetics. (2021). Emulsifiers.
[5] Journal of the American College of Toxicology. (1983). Final Report on the Safety Assessment of Polyethylene Glycol (PEG) -4 Dilaurate, PEG-4 Dioleate, PEG-4 Stearate, PEG-6 Caprylic/Capric Glycerides, PEG-6 Dioleate, PEG-6 Isostearate, PEG-6 Oleate, PEG-6 Stearate, PEG-7 Glyceryl Cocoate, PEG-8 Dioleate, PEG-8 Stearate, PEG-9 Stearate, PEG-12 Dilaurate, PEG-12 Dioleate, PEG-12 Oleate, PEG-12 Stearate, PEG-15 Stearate, PEG-20 Dilaurate, PEG-20 Glyceryl Stearate, PEG-20 Oleate, PEG-20 Stearate, PEG-23 Oleate, PEG-25 Stearate, PEG-25 Hydrogenated Castor Oil, PEG-26 Oleate, PEG-30 Dipolyhydroxystearate, PEG-30 Glyceryl Cocoate, PEG-30 Glyceryl Stearate, PEG-30 Oleate, PEG-30 Stearate, PEG-32 Dilaurate, PEG-32 Dioleate, PEG-32 Stearate, PEG-35 Castor Oil, PEG-35 Stearate, PEG-36 Oleate, PEG-36 Stearate, PEG-40 Castor Oil, PEG-40 Hydrogenated Castor Oil, PEG-40 Sorbitan Diisostearate, PEG-40 Sorbitan Peroleate, PEG-40 Stearate, PEG-40 Sorbitan Stearate, PEG-45 Stearate, PEG-50 Stearate, PEG-55 Stearate, PEG-60 Castor Oil, PEG-75 Lanolin, PEG-80 Sorbitan Laurate, PEG-80 Sorbitan Palmitate, PEG-100 Stearate, PEG-150 Distearate, PEG-150 Stearate, PEG-200 Dilaurate, PEG-200 Glyceryl Stearate, PEG-150 Pentaerythrityl Tetrastearate. Journal of the American College of Toxicology, 2(7), 87-130.
[6] Cosmetics & Toiletries. (2013). Emulsifiers: Properties, Classification, and Selection.
[7] Draelos, Z. D. (2018). Cosmetics in dermatology. John Wiley & Sons.
[8] Lodén, M., & Barnes, T. M. (2020). Textbook of cosmetic dermatology. CRC press.
[9] AOCS Press. (2000). Edible and inedible fats and oils.
[10] Flick, E. W. (1989). Cosmetic and toiletry formulations, Vol. 6. Noyes Publications.
[11] Ash, M., & Ash, I. (2004). Handbook of preservatives. Synapse Information Resources.

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