Isopropyl Isostearate vs. Isopropyl Myristate

Attribute	Isopropyl Isostearate	Isopropyl Myristate
Chemical Formula	C19H38O2	C17H34O2
Molecular Weight	298.50 g/mol	270.45 g/mol
Function	Emollient, skin conditioning agent	Emollient, skin conditioning agent
Source	Synthetic	Synthetic

Introduction

Isopropyl Isostearate and Isopropyl Myristate are two commonly used ingredients in skincare and cosmetic products. Both are esters of isopropyl alcohol, but they have different chemical structures and properties that make them suitable for different applications. In this article, we will compare the attributes of Isopropyl Isostearate and Isopropyl Myristate to help you understand their differences and choose the right ingredient for your formulation.

Chemical Structure

Isopropyl Isostearate is derived from isostearic acid, which is a branched-chain fatty acid. It has a higher molecular weight and a more complex structure compared to Isopropyl Myristate, which is derived from myristic acid, a straight-chain fatty acid. The difference in their chemical structures affects their solubility, viscosity, and skin feel when used in formulations.

Solubility

Isopropyl Isostearate is more soluble in oils and less soluble in water compared to Isopropyl Myristate. This makes Isopropyl Isostearate a better choice for oil-based formulations, such as moisturizers and serums, where it can help improve the spreadability and absorption of other ingredients. On the other hand, Isopropyl Myristate is more soluble in water and can be used in water-based formulations, such as lotions and creams, to enhance the emollient and conditioning properties of the product.

Viscosity

Isopropyl Isostearate has a higher viscosity compared to Isopropyl Myristate, which makes it suitable for thickening and stabilizing formulations. It can help create a rich and creamy texture in skincare products, such as body butters and balms, without feeling greasy or heavy on the skin. Isopropyl Myristate, on the other hand, has a lower viscosity and can be easily spread on the skin, making it ideal for lightweight formulations, such as facial moisturizers and sunscreens.

Skin Feel

Isopropyl Isostearate provides a silky and smooth feel on the skin, leaving it soft and hydrated without a greasy residue. It is often used in anti-aging products and lip care products for its moisturizing and conditioning properties. Isopropyl Myristate, on the other hand, has a lighter texture and absorbs quickly into the skin, making it suitable for daily use in body lotions and hair care products to improve the overall feel and appearance of the skin and hair.

Stability

Both Isopropyl Isostearate and Isopropyl Myristate are stable ingredients that have a long shelf life when stored properly. They are resistant to oxidation and do not easily degrade when exposed to light or heat. This makes them suitable for use in a wide range of cosmetic and skincare formulations, where stability and efficacy are important factors to consider.

Conclusion

In conclusion, Isopropyl Isostearate and Isopropyl Myristate are two versatile ingredients that offer unique benefits in skincare and cosmetic formulations. While Isopropyl Isostearate is more suitable for oil-based products with a rich and creamy texture, Isopropyl Myristate is better suited for water-based products with a lightweight and easily spreadable texture. Understanding the differences in their chemical structures, solubility, viscosity, skin feel, and stability can help you choose the right ingredient for your specific formulation needs.