Ingredient review

Acrylates Crosspolymer-4

INCI: Acrylates Crosspolymer-4

A safe, synthetic thickener that improves product texture and stability without clogging pores or irritating skin.

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In plain English

Acrylates Crosspolymer-4 is a synthetic ingredient used to thicken and stabilize skincare products. Think of it like a tiny sponge network that soaks up liquid and creates a smooth, gel-like texture. It helps keep the product from separating and gives it a pleasant, non-greasy feel on your skin. It is not absorbed into the skin and sits on the surface, so it is generally very safe and non-irritating.

Quick decision guide

Useful, but context matters

Acrylates Crosspolymer-4 is generally a lower-concern ingredient when the full formula suits your skin.

Plain-English read

Treat this as a practical screening step before you compare products that contain this ingredient.

  1. Step 1Start with the score, then check the irritation and clogging risk before judging Acrylates Crosspolymer-4.
  2. Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
  3. Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.

Score terms in plain English

Irritation risk

low

Less likely to sting, burn, or bother most users, though sensitive skin can still react.

Clogging risk

low

Less likely to feel heavy or contribute to clogged pores for most skin types.

Evidence level

moderate

There is useful support, but formula details and claim strength still matter.

What it is

Acrylates Crosspolymer-4 is a high-molecular-weight synthetic polymer made from acrylic acid derivatives that are crosslinked to form a three-dimensional network. It is a white, free-flowing powder that swells when mixed with water, creating a clear or translucent gel.

How it works

When added to water, the polymer particles absorb water and swell, increasing the viscosity of the formula. This creates a stable gel or cream texture. It also helps keep oil and water phases from separating (emulsion stabilization) and can improve the sensory feel of a product, making it feel silky and lightweight.

Pros

Excellent texture enhancer

Creates a smooth, lightweight gel that feels silky on the skin and helps serums and creams spread easily without greasiness.

Very low irritation potential

Because it stays on the skin's surface and does not penetrate, it is unlikely to cause irritation or allergic reactions, making it suitable for sensitive skin.

Cons and cautions

Synthetic origin

It is a man-made polymer, which may be a turn-off for consumers seeking natural or organic skincare products.

Potential tackiness at high levels

If used in very high concentrations, it can leave a slightly sticky or tacky residue on the skin, though this is rare in well-formulated products.

Best for

  • Anyone who enjoys lightweight, gel-based skincare products
  • People with oily or combination skin looking for a matte finish

Use caution if

  • Those who prefer 100% natural or plant-based ingredient lists

Usage tips

Apply gel-based products containing this ingredient to slightly damp skin for better spreadability.
Layer lightweight gels under heavier creams if you need extra hydration without a heavy feel.

Safety summary

Acrylates Crosspolymer-4 is considered very safe for topical use. It is non-irritating, non-sensitizing, and non-comedogenic. It does not penetrate the skin and poses no known health risks at typical cosmetic concentrations.

Research notes

Safety assessments by the Cosmetic Ingredient Review (CIR) panel have concluded that acrylates crosspolymers are safe for use in cosmetics. No significant toxicity or irritation has been reported in clinical studies. Research focuses on its function as a rheology modifier rather than any biological activity on the skin.

Common label clues

Typical concentration
0.1% to 2%
Regulatory status
Approved for use in cosmetics in the US, EU, and most other regions. The Cosmetic Ingredient Review (CIR) panel has deemed acrylates crosspolymers safe as used in cosmetics.
Common uses
Gels, Serums, Creams, Lotions
Environmental note
As a synthetic polymer, it is not biodegradable. However, it is used in very small amounts and is not known to accumulate in the environment.

Good to know

  • Acrylates Crosspolymer-4 is often used in 'water gel' or 'jelly' textures that are popular in Korean skincare.
  • It is considered safe by major regulatory bodies including the FDA and the Cosmetic Ingredient Review (CIR) panel.

Common questions

What is Acrylates Crosspolymer-4 in beauty products?

Acrylates Crosspolymer-4 is a synthetic ingredient used to thicken and stabilize skincare products. Think of it like a tiny sponge network that soaks up liquid and creates a smooth, gel-like texture. It helps keep the product from separating and gives it a pleasant, non-greasy feel on your skin. It is not absorbed into the skin and sits on the surface, so it is generally very safe and non-irritating.

What does Acrylates Crosspolymer-4 do in a beauty product?

When added to water, the polymer particles absorb water and swell, increasing the viscosity of the formula. This creates a stable gel or cream texture. It also helps keep oil and water phases from separating (emulsion stabilization) and can improve the sensory feel of a product, making it feel silky and lightweight.

Is Acrylates Crosspolymer-4 safe for most people?

Acrylates Crosspolymer-4 is considered very safe for topical use. It is non-irritating, non-sensitizing, and non-comedogenic. It does not penetrate the skin and poses no known health risks at typical cosmetic concentrations.

Who should be careful with Acrylates Crosspolymer-4?

Those who prefer 100% natural or plant-based ingredient lists

Research sources

Cosmetic Ingredient Review (CIR) - Safety Assessment of Acrylates CrosspolymersOpenPubChem - Acrylates Crosspolymer-4OpenEWG Skin Deep - Acrylates Crosspolymer-4Open

Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.