Description
PEG 40 most commonly refers to PEG-40 Hydrogenated Castor Oil, a widely used ingredient in the cosmetics and personal care industry. It is a synthetic polymer that combines polyethylene glycol (PEG) with natural hydrogenated castor oil.
PEG-40 is a “polyethylene glycol” derivative, where the number “40” indicates the average number of ethylene oxide units in the molecule. This chemical structure gives it unique properties that make it a multi-functional ingredient. It is a waxy liquid or semi-solid paste that is soluble in both oil and water, making it a valuable tool in formulations.Here are the key chemical and functional properties of PEG-40 Hydrogenated Castor Oil, a widely used nonionic surfactant and solubilizer in cosmetic and personal care formulations:
Chemical Properties
| Property | Description |
| Appearance | White to yellowish semi-solid paste |
| Solubility | Soluble in both water and oil |
| HLB Value | ~15 (suitable for oil-in-water emulsions) |
| pH (3% in water) | 6 – 8 |
| Density | ~1.02 g/cm³ |
| Flash Point | >100 °C |
| Stability | Stable under normal conditions; compatible with a wide range of ingredients |
| Biodegradability | Considered biodegradable under standard conditions |
Uses
Emulsifier: Its most important function. It allows for the mixing of oil-based and water-based ingredients that would normally separate. This is crucial for creating stable, uniform products like creams, lotions, and milk-like cleansers.
Solubilizer: It helps to dissolve fragrances, essential oils, and other oil-soluble ingredients into water-based formulas. This is why you’ll often find it in perfumes, toners, and room sprays.
Surfactant (Cleansing Agent): It reduces the surface tension of liquids, helping to lift and remove dirt, oil, and impurities from the skin and hair. This makes it a popular ingredient in shampoos, body washes, and facial cleansers.
Emollient: It helps to soften and smooth the skin by forming a protective layer that minimizes moisture loss. This makes it beneficial for dry or sensitive skin and helps to keep the skin hydrated.
Products that Contain PEG-40 Hydrogenated Castor Oil:
You can find this ingredient in a wide variety of personal care and cosmetic products, including:
Skincare: Moisturizers, creams, lotions, facial cleansers, serums, and toners.
Haircare: Shampoos, conditioners, hair styling products, and serums.
Color Cosmetics: Foundations, blushes, and other makeup products.
Other Products: Aftershaves, sunscreens, lip balms, perfumes, and mouthwashes.
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