Polymethylsilsesquioxane at a glance

•  Used as a film former and skin conditioning ingredient
•  Is a powder with round-shaped particles
•  Is used in amounts up to 55.2% in cosmetics
•  Deemed safe as used in cosmetics, with no evidence of toxicity or sensitisation

Polymethylsilsesquioxane description

Polymethylsilsesquioxane is a polymer formed from the condensation and hydrolysis of the silicone methyltrimethoxysilane. In cosmetics, it functions primarily as a film former and skin conditioning ingredient. 

In its raw form, it is a powder with round particles. 

 In a survey of cosmetic formulations, polymethylsilsesquioxane was found to be used in amounts as high as 55.2%, but most often at concentrations of 4.9% or less. 

The independent Cosmetic Ingredient Review panel found that polymethylsequioxane is safe as used in cosmetics, with no evidence of toxicity or sensitisation. 

This silicone polymer is also not known to clog pores.

What is POLYMETHYLSILSESQUIOXANE used for?

Polymethylsilsesquioxane has plenty of uses in skin care, hair care, and cosmetics. It is widely used in products such as lotions, shampoos, and makeup.

• Skin care: It has anti-aging and film-forming properties that lock in moisture and keep the skin hydrated throughout the day. This ingredient is responsible for the silky appearance of the skin and is also good for absorbing oil. Further, it also improves the texture and feel of the products - leaving them richer and creamier.
• Hair care: It acts as a conditioner and improves the look and feel of the hair shafts. It forms a film on the hair which reduces the loss of moisture and thus keeps the shafts nourished.

Origin

Polymethylsilsesquioxane is a type of silicone that is made by the hydrolysis and condensation of silicone methyltrimethoxysilane. Further, Polymethylsilsesquioxane is not natural but is a synthetic polymer made in labs.

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What does POLYMETHYLSILSESQUIOXANE do in a formulation?

• Film forming
• Hair conditioning
• Opacifying
• Skin protecting

Safety profile

Contrary to the common misconceptions, Polymethylsilsesquioxane is a highly safe ingredient and does not have any harmful side effects. It is sometimes said to be toxic because it is silicone, however, researchers have found this to be untrue. For Polymethylsilsesquioxane to be a danger it would have to be absorbed into the skin or scalp. But, its molecules are large enough to prevent this. Polymethylsilsesquioxane is also gluten-free and non-comedogenic, which means that it does not cause acne.

Advantages:

Good lubricity and soft skin feel of the powder.

Oil-controlling, matte finish.

Good pigment dispersion.

Characteristics:

Spherical structure.

Narrow particle size distribution.

Fine particle size.

Application Areas:

Foundation, eye shadow, lipstick and other makeup products

Oil-control and cream products

Powder products