What Is Dimethicone/Bis-Isobutyl Ppg-20 Crosspolymer?
Dimethicone/Bis-Isobutyl Ppg-20 Crosspolymer is a silicone-based material created by crosslinking hydrogen dimethicone with bis-methallyl Ppg-20. This process produces a three-dimensional network that feels silky, flexible and lightweight on the skin. Silicones have been used in cosmetics since the mid-20th century for their smooth glide and protective feel, and chemists developed this particular crosspolymer to improve texture and stability in modern formulas.
The ingredient starts with dimethicone, a well-known cosmetic silicone, and Ppg-20, a polypropylene glycol unit that adds softness. Through controlled heat and catalytic reactions, the two molecules are chemically linked, forming a porous yet stable gel-like matrix. After purification and quality checks, the finished powder or gel is ready for use by cosmetic labs.
You will most often find Dimethicone/Bis-Isobutyl Ppg-20 Crosspolymer in lightweight moisturizers, primers, oil-free lotions, anti-aging creams and leave-on masks. It can also show up in sunscreens, hair-smoothing serums and color cosmetics where a velvety finish and consistent viscosity are desired.
Dimethicone/Bis-Isobutyl Ppg-20 Crosspolymer’s Cosmetic Benefits/Uses
This ingredient serves more than one purpose in a formulation, giving product developers a versatile tool for creating smooth, stable and pleasant textures.
- Emollient: Forms a breathable layer that fills in fine surface lines, reducing roughness and leaving skin feeling soft and silky without a greasy after-feel
- Viscosity controlling: Helps thicken or stabilize a formula, preventing separation and ensuring the product spreads evenly for a consistent application every time
Who Can Use Dimethicone/Bis-Isobutyl Ppg-20 Crosspolymer
Because it is lightweight and non-greasy, this silicone crosspolymer suits most skin types, including oily, combination and sensitive skin. Dry skin can also benefit from the silky emollient film it leaves behind, which helps reduce moisture loss. People with very acne-prone skin who react poorly to any silicone may prefer to monitor how their complexion responds, but in many formulas the ingredient is present at low levels that rarely cause issues.
Dimethicone/Bis-Isobutyl Ppg-20 Crosspolymer is synthesized entirely from lab-made raw materials, so it contains no animal derivatives and is suitable for vegans and vegetarians.
Current safety data show no reproductive or developmental risks, so products using this ingredient are generally considered safe for women who are pregnant or breastfeeding. This is not medical advice, and anyone who is expecting or nursing should review their skincare routine with a qualified health professional to be safe.
The polymer does not increase skin sensitivity to sunlight, so it does not require any special sun precautions beyond normal SPF use.
Potential Side Effects/Adverse Reactions
Responses to topical Dimethicone/Bis-Isobutyl Ppg-20 Crosspolymer differ from person to person. The effects listed below are only possibilities and are uncommon when the ingredient is included at typical cosmetic levels.
- Mild transient redness or stinging in very sensitive skin
- Temporary clogged pores or blemishes in individuals who are highly silicone-reactive
- Rare allergic contact dermatitis presenting as itching or small bumps
- Product buildup on hair shafts if used in leave-on hair care, leading to a weighed-down feel
If any irritation or unexpected reaction develops, discontinue use and seek guidance from a healthcare professional.
Comedogenic Rating
Rating: 1 out of 5
Dimethicone/Bis-Isobutyl Ppg-20 Crosspolymer forms a lightweight, breathable film that sits on top of the skin rather than sinking into pores. Its large crosslinked structure makes it unlikely to lodge inside follicular openings, so it rarely triggers blackheads or whiteheads. A rating of 1 reflects this low pore-clogging risk while acknowledging that a small number of silicone-sensitive users may still notice congestion. Overall it is considered suitable for acne-prone skin in most cases. Formulas that combine it with heavy oils or waxes, however, may increase the chance of breakouts, so the full ingredient list matters.
Summary
Dimethicone/Bis-Isobutyl Ppg-20 Crosspolymer works as an emollient and viscosity controller. Its crosslinked silicone network glides across the skin, filling in surface gaps to leave a soft, silky finish while reducing moisture loss. At the same time the polymer thickens and stabilizes creams, lotions and serums so they spread evenly and resist separation.
This specialty silicone is not as famous as plain dimethicone yet it is gaining traction in modern lightweight moisturizers, primers and sunscreens because formulators appreciate its velvety feel and ease of use.
Safety studies and long industry experience show a very low risk of irritation or toxicity, making the ingredient broadly safe for daily use. As with any new product it is wise to do a small patch test first to confirm personal compatibility.