What Is Sodium Polyacrylate Crosspolymer-1?
Sodium Polyacrylate Crosspolymer-1 is a man-made polymer that acts like a flexible net when it is mixed into skincare or makeup. Chemists create it by first linking silicone chains to a special form of polyethylene glycol, then blending that silicone copolymer with water, sodium hydroxide, methacrylic acid and a phosphate-bearing monomer. The result is a crosslinked structure that swells slightly in water yet stays stable on the skin, giving formulas a smooth, cushiony feel.
The material grew out of research in the late 1990s aimed at combining the silky slip of silicone with the water-holding ability of acrylic gels. Its balanced texture soon caught the eye of cosmetic labs looking to give lotions a lighter finish without sacrificing moisture. Today manufacturers regularly add it to sheet masks, gel moisturizers, anti-aging serums, primers and cream highlighters because it helps those products spread evenly and stay in place.
Sodium Polyacrylate Crosspolymer-1’s Cosmetic Benefits/Uses
This ingredient improves both how a product feels and how it performs on the skin.
- Film forming – creates a thin, flexible layer that locks active ingredients where they are applied, boosts wear time for makeup and reduces water loss from the surface of the skin
- Skin conditioning – adds a soft, smooth finish that makes skin feel hydrated and comfortable after application
- Emollient – fills in tiny surface gaps so skin feels plush and less rough while giving formulas a silky glide during use
Who Can Use Sodium Polyacrylate Crosspolymer-1
Sodium Polyacrylate Crosspolymer-1 is generally well tolerated by all skin types. Its light, non greasy film works for oily or combination complexions because it does not add extra oil, while the cushioned feel appeals to dry or mature skin that needs softness. Sensitive or reactive skin usually handles the polymer without trouble since it has no fragrance or known sensitizing impurities, though exceptionally reactive individuals should still be cautious with any new ingredient.
The polymer is entirely synthetic with no animal derived components, so products that use it are suitable for vegans and vegetarians.
Available safety data show no reproductive or developmental concerns, so those who are pregnant or breastfeeding can typically use products containing Sodium Polyacrylate Crosspolymer-1. This is not medical advice and anyone who is pregnant or nursing should confirm product choices with a healthcare professional to be safe.
The ingredient does not make skin more sensitive to sunlight, so it is considered non-photosensitizing.
Potential Side Effects/Adverse Reactions
Responses to topical Sodium Polyacrylate Crosspolymer-1 can vary. The effects listed below are only potential issues and are unlikely for most people when the ingredient is properly formulated and used as directed.
- Mild skin irritation such as transient redness or itching, typically in very sensitive individuals
- Allergic contact dermatitis in rare cases where a person is specifically allergic to acrylic polymers or residual monomers
- Stinging sensation on compromised skin if applied over open cuts, eczema flares or freshly exfoliated areas
- Enhanced potency of other actives because the film can slow their evaporation leading to stronger than expected effect for ingredients like retinoids or acids
If any discomfort or adverse reaction occurs stop use immediately and consult a medical professional
Comedogenic Rating
Rating: 0–1 (essentially non-comedogenic)
Sodium Polyacrylate Crosspolymer-1 is a large, water-swellable polymer that stays on the skin surface and does not penetrate or mix with sebum. It forms a breathable film without adding oil or wax, so it is extremely unlikely to block pores. Therefore it ranks at the very low end of the scale.
Suitable for acne-prone or breakout-prone skin.
Because the polymer can hold other ingredients on the skin longer, any pore-clogging effect would come from those partner ingredients, not from Sodium Polyacrylate Crosspolymer-1 itself.
Summary
Sodium Polyacrylate Crosspolymer-1 works as a film former, skin conditioner and emollient. Its crosslinked structure creates a light, flexible mesh that smooths texture, locks in moisture and helps active ingredients stay where they are applied, giving products a soft cushiony glide and longer wear.
The polymer has gained steady popularity in modern gels, serums and makeup primers because it offers the silky feel of silicone without heaviness, yet it is still less common than older acrylic thickeners so you may not see it in every formula.
Current safety data show it is low risk for irritation, non-sensitizing and non-photosensitizing. As with any new cosmetic ingredient it is wise to perform a patch test when trying a product that contains Sodium Polyacrylate Crosspolymer-1, especially if your skin is reactive.