What Is Hydroxypropyltrisiloxyl Ipdi/Peg-23 Copolymer?
Hydroxypropyltrisiloxyl Ipdi/Peg-23 Copolymer is a lab-designed ingredient created by linking three main building blocks: a silicone segment called hydroxypropyltrisiloxyl, an isophorone diisocyanate (IPDI) hard segment, and a water-loving polyethylene glycol chain with an average of 23 repeating units. The result is a flexible copolymer that can cling to skin while also mingling well with both oils and water.
Silicones have been popular in beauty care since the 1950s for their silky feel. Over time chemists began combining them with modern polyurethane chemistry, giving rise to hybrid polymers like this one in the early 2000s. By fusing silicone texture with PEG softness, formulators gained a new tool that handles cleansing agents and conditioning oils in a single molecule.
Production starts with reacting hydroxy-terminated trisiloxane with IPDI, forming a pre-polymer. This is then coupled with PEG-23 under controlled heat and catalysts until the chain length reaches the desired balance of flexibility and strength. The finished material is filtered, neutralized, and dried into a pourable liquid or soft resin ready for cosmetic use.
You will spot Hydroxypropyltrisiloxyl Ipdi/Peg-23 Copolymer in lightweight facial moisturizers, leave-on masks, anti-aging serums, micellar cleansers, hair smoothing creams, and long-wear makeup where a breathable film and a fresh after-feel are prized.
Hydroxypropyltrisiloxyl Ipdi/Peg-23 Copolymer’s Cosmetic Benefits/Uses
Formulators reach for this multitasker because it fills several roles at once, allowing shorter ingredient lists and more elegant textures.
- Binding: Acts as a gentle adhesive that helps pigments, powders and active ingredients stick evenly to skin or hair so products last longer and resist rub-off
- Cleansing: Its silicone-PEG backbone can lift away dirt and makeup without stripping natural oils making it useful in micellar waters and rinse-off washes
- Skin Conditioning: Leaves behind a thin breathable film that smooths rough patches, boosts softness and imparts a subtle silky finish without a heavy or greasy feel
Who Can Use Hydroxypropyltrisiloxyl Ipdi/Peg-23 Copolymer
This ingredient is generally well tolerated by all skin types including dry, oily, combination and sensitive skin thanks to its lightweight breathable film. Those with very reactive or silicone-sensitive skin should still watch for any discomfort as the silicone segment may feel occlusive to a small number of users.
Hydroxypropyltrisiloxyl Ipdi/Peg-23 Copolymer is synthesized entirely from laboratory-made components and contains no animal-derived matter so it is considered suitable for both vegans and vegetarians.
Current data shows no link between the ingredient and reproductive or developmental risks. Pregnant or breastfeeding users can typically use products that contain it, but this is not medical advice and anyone expecting or nursing should check with a healthcare provider before starting new skincare just to be safe.
The copolymer does not make skin more sensitive to sunlight and it is stable under UV exposure. It also has no known conflicts with common actives like retinol or vitamin C so it can be layered without special timing.
Potential Side Effects/Adverse Reactions
Responses to topical Hydroxypropyltrisiloxyl Ipdi/Peg-23 Copolymer differ from person to person. The points below cover possible side effects, yet they remain uncommon when the ingredient is formulated and used correctly.
- Mild redness or itching
- Transient stinging on very damaged or freshly exfoliated skin
- Rare silicone-related clogged pores in individuals already prone to congestion
- Allergic contact dermatitis in those with a hypersensitivity to polyurethane or PEG materials
If irritation or any unexpected reaction occurs discontinue use and seek advice from a medical professional
Comedogenic Rating
Rating: 1 out of 5. Hydroxypropyltrisiloxyl Ipdi/Peg-23 Copolymer forms a very thin breathable film that allows water vapor to escape so it is unlikely to block pores. Its large molecular size keeps it mostly on the skin surface instead of sinking into follicular openings. A trace amount of users may notice buildup if they already experience heavy oil production or layer several silicone-rich products, but under normal use the risk of breakouts is low.
Suitable for acne-prone skin in most cases.
Because the ingredient is usually blended with other oils, waxes or pigments, overall pore-clogging potential will depend on the full formula rather than this polymer alone.
Summary
Hydroxypropyltrisiloxyl Ipdi/Peg-23 Copolymer binds pigments, boosts cleansing performance and conditions skin by draping a soft weightless film that feels silky yet non-greasy. Its silicone segment provides slip and durability while the PEG chain improves water compatibility letting it lift dirt and distribute active ingredients more evenly.
The polymer is not as common as classic dimethicone but it is gaining traction in modern multitask formulas that aim for shorter labels and a lighter feel. You will mainly find it in higher-end lotions, micellar cleansers, hybrid makeup and leave-on masks where a fresh finish is valued.
Current research shows a low level of irritation, no phototoxicity and minimal comedogenicity so it is considered safe for everyday use. As with any new cosmetic ingredient it is wise to perform a small patch test before applying a product all over the face or body.