Product Introduction

PEG-40 stearate is a polyethylene glycol ester of stearic acid. As a nonionic surfactant, it is created through the ethoxylation of stearic acid, a naturally occurring fatty acid [1]. The number "40" signifies the average number of ethylene oxide units in the molecule. This ingredient functions primarily as an emulsifier, helping to mix oil and water-based ingredients, and as a surfactant, reducing surface tension.

Production Process

The production of PEG-40 stearate involves reacting stearic acid with ethylene oxide in the presence of a catalyst. This process, known as ethoxylation, attaches polyethylene glycol (PEG) chains of a specific length to the stearic acid molecule [2]. Controlling the reaction conditions, such as temperature, pressure, and catalyst type, is crucial for achieving the desired degree of ethoxylation, indicated by the "40" in PEG-40 stearate. After the reaction is complete, the product is purified to remove any unreacted materials and by-products.

Efficacy and Function

PEG-40 stearate is valued for its emulsifying and solubilizing properties in cosmetic formulations. It aids in the creation of stable emulsions, preventing the separation of oil and water phases, and improves the texture and consistency of creams and lotions [3]. Moreover, it can enhance the solubility of certain ingredients, ensuring their even distribution throughout the product. Its surfactant properties contribute to the cleansing action of some formulations by helping to remove oil and dirt from the skin.

Application Scenarios

PEG-40 stearate is used in a wide range of cosmetic and personal care products. These include creams, lotions, sunscreens, cleansers, and makeup removers, where it helps to stabilize formulations and improve their application properties [4]. It's also found in hair care products like conditioners and styling aids, contributing to the product's texture and performance.

Packaging and Transportation

PEG-40 stearate is generally packaged in containers suitable for solid or semi-solid materials, such as drums or bags, ensuring protection from moisture and contamination during transportation. Transportation should adhere to standard practices for non-hazardous materials, keeping the product in a cool, dry environment to prevent melting or degradation. Proper labeling, including batch number, production date, and storage instructions, is essential.

Citations

[1] Fiume, M. M., et al. "Final report on the safety assessment of PEG-5 Stearate, PEG-10 Stearate, PEG-20 Stearate, PEG-30 Stearate, PEG-40 Stearate, PEG-100 Stearate, PEG-150 Stearate, PEG-175 Stearate." International Journal of Toxicology 24 Suppl 3 (2005): 49-74.

[2] Schick, M. J., ed. Nonionic Surfactants: Chemical Analysis. CRC Press, 1987.

[3] Hill, R. A. "Analysis of cosmetic products." Handbook of cosmetic science and technology 3 (2009): 3-24.

[4] Draelos, Z. D. Cosmetics dermatology. John Wiley & Sons, 2015.

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