What Is Vinyl Dimethicone/Methicone Silsesquioxane Crosspolymer?
Vinyl Dimethicone/Methicone Silsesquioxane Crosspolymer is a silicone based ingredient formed by linking vinyl dimethicone units with a methicone silsesquioxane network, creating a three dimensional lattice that behaves like a soft focus powder in waterless or low water formulas. The raw materials come from silica, which is converted into organosilicon compounds through well established industrial processes. In the 1950s basic silicones gained popularity for their silky slip, then in the 1990s chemists began crosslinking them to build ingredients that could boost texture without adding weight, leading to this crosspolymer.
Manufacturing involves hydrolyzing and condensing silane monomers, then curing the mixture so the polymer chains lock together. The resulting solid is milled into a fine, free flowing powder or dispersed in silicone fluid, ready to blend into cosmetic bases.
You will most often find Vinyl Dimethicone/Methicone Silsesquioxane Crosspolymer in primers, liquid and powder foundations, BB creams, sunscreens, mattifying or blurring serums, anti aging lotions, leave on masks and some hair styling products where a lightweight, velvety finish is desired.
Vinyl Dimethicone/Methicone Silsesquioxane Crosspolymer’s Cosmetic Benefits/Uses
This ingredient plays a single but important role in product performance.
Viscosity controlling: it thickens oils or silicone phases just enough to stop formulas from feeling runny while still letting them spread effortlessly. The tiny porous particles suspend pigments, UV filters and other actives so they stay evenly distributed, which helps makeup go on smoothly, improves wear time and gives skin a soft, non greasy finish.
Who Can Use Vinyl Dimethicone/Methicone Silsesquioxane Crosspolymer
Because it is non irritating and largely inert, Vinyl Dimethicone/Methicone Silsesquioxane Crosspolymer is generally considered suitable for all skin types including dry, normal, combination, oily and sensitive skin. Its lightweight feel and breathable finish mean it rarely weighs down oily complexions yet still lends slip to drier skin without a heavy, occlusive film. There are no specific skin types that must avoid it, though individuals with a known silicone sensitivity should proceed with caution for obvious reasons.
The ingredient is synthesized from mineral derived silica rather than animal material so it is vegan and vegetarian friendly. No animal by products are used at any stage of production and it is not inherently tested on animals, although final product testing policies vary by brand and region.
Current data shows no hormonal activity or systemic absorption, so products containing this crosspolymer are considered low risk for women who are pregnant or breastfeeding. Still, this is not medical advice and anyone who is expecting or nursing should review their skin care routine with a qualified health professional to be safe.
Vinyl Dimethicone/Methicone Silsesquioxane Crosspolymer does not increase photosensitivity. It can actually help stabilize sunscreen filters by keeping them evenly dispersed, which may indirectly support sun protection.
Potential Side Effects/Adverse Reactions
Side effects and reactions to topical Vinyl Dimethicone/Methicone Silsesquioxane Crosspolymer can vary from person to person. The points below outline potential issues that could occur, though they are not expected to be the typical user experience when the ingredient is properly formulated in a product.
- Mild skin irritation such as temporary redness or itching
- Breakouts in individuals who find any silicone film too occlusive
- Allergic contact dermatitis in those with a documented silicone allergy
- Eye irritation if loose powder versions are inhaled or get into the eyes
If you notice persistent discomfort, redness, swelling or any other unexpected reaction while using a product that contains this ingredient discontinue use and consult a healthcare professional.
Comedogenic Rating
Rating: 1/5
Vinyl Dimethicone/Methicone Silsesquioxane Crosspolymer is a large, inert silicone particle that sits on top of skin and does not penetrate pores. Its airy lattice structure allows good breathability and has minimal ability to trap oil or dead skin that could start a clog. A tiny number of people who are highly sensitive to any silicone film might notice congestion, which is why the rating is not a perfect zero.
Overall it is considered suitable for acne-prone or breakout-prone skin.
Worth noting: the ingredient is usually present at low levels in finished products and is almost always paired with lightweight volatile silicones that evaporate after application, further reducing any risk of pore blockage.
Summary
Vinyl Dimethicone/Methicone Silsesquioxane Crosspolymer is mainly a viscosity controller that thickens the oil or silicone phase of a formula, suspends pigments and actives then leaves a velvety, soft focus finish. It achieves this thanks to its three dimensional silicone lattice which swells slightly in oils and holds particles evenly in place while still letting the product spread easily.
You will spot it most often in primers, foundations, BB creams, sunscreens and blur sticks where it helps formulas feel silky not greasy. It is not as famous as classic dimethicone but chemists appreciate its performance so it crops up regularly in mid to high-end makeup and skincare.
Current research shows it is low risk for irritation, allergy or hormonal activity so it is widely considered safe for everyday use. As with any new cosmetic ingredient it is smart to patch test a fresh product first, especially if your skin is reactive.