Is PEG-40 Hydrogenated Castor Oil natural?

Castor oil hydrogenated then ethoxylated with 40 mol petrochemical ethylene oxide.

The synthesis of PEG-40 Hydrogenated Castor Oil involves two main steps: ethoxylation and hydrogenation.

First, castor oil undergoes ethoxylation. Castor oil is a triglyceride rich in ricinoleic acid, a fatty acid with a hydroxyl group. This hydroxyl group reacts with ethylene oxide (EO) in the presence of a catalyst, typically a strong base like potassium hydroxide (KOH) or sodium hydroxide (NaOH). The reaction is carried out at elevated temperatures, usually between 120-180°C, and under pressure to control the exothermic reaction of EO. The number '40' in the INCI name indicates that, on average, 40 moles of ethylene oxide are added per mole of castor oil.

Following ethoxylation, the resulting ethoxylated castor oil is hydrogenated. This process reduces any residual unsaturation in the fatty acid chains and any residual double bonds that may have formed during ethoxylation, thereby improving the stability and oxidative resistance of the final product. Hydrogenation is typically performed using hydrogen gas in the presence of a metal catalyst, such as nickel (Ni) or palladium (Pd), often supported on carbon. The reaction conditions involve moderate temperatures (e.g., 100-150°C) and pressures.

Purification steps may include filtration to remove the catalyst and potentially washing or distillation to remove any unreacted materials or byproducts, ensuring the final product meets cosmetic grade specifications.

PEG-40 Hydrogenated Castor Oil is a versatile ingredient used in many cosmetic and personal care products. It's essentially a modified version of castor oil, a natural oil extracted from the seeds of the castor bean plant. Think of it as making the natural oil more compatible with water and other ingredients in your formulations.

To create it, natural castor oil is first reacted with a compound called ethylene oxide, which is typically made from petroleum. This process, called ethoxylation, adds a chain of 'PEG' units (polyethylene glycol) to the castor oil. The '40' tells us that, on average, about 40 of these units are added. After this, the modified oil is treated with hydrogen gas to make it more stable and less prone to spoilage. This final step is called hydrogenation.

Because it starts with a natural oil but uses a petroleum-derived component (ethylene oxide), it's considered to have a balanced natural and synthetic origin. It acts as an emulsifier, helping to mix oil and water-based ingredients, and also as a solubilizer, allowing fragrances or other oil-soluble ingredients to dissolve in water-based products.

CosIng definition: Castor oil (Ricinus communis), hydrogenated, ethoxylated (40 mol EO average molar ratio)