Sodium Carbomer

What is Sodium Carbomer?

Sodium Carbomer is a synthetic, hydrophilic polymer created by crosslinking acrylic acid monomers and neutralizing with sodium hydroxide. This results in a fine, white powder that rapidly absorbs water, expanding up to 1000 times its weight to form clear, smooth gels. Primarily used in water-based and hydroalcoholic cosmetic formulations like serums, lotions, cleansers, and sunscreens, it functions by building a three-dimensional network that traps water and oils, preventing separation and enhancing product stability. Its pre-neutralized form disperses easily without needing pH adjustment, making it ideal for gentle, transparent gels that spread evenly on skin without residue. In emulsions, it strengthens the interface between phases, while as a film-former, it provides a flexible barrier for better product performance.

Comedogenic Rating 0/5 Low risk of clogging pores

EWG Safety Rating 1 View on EWG →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Emulsion stabilizer

Improves emulsion robustness by preventing droplet coalescence and phase separation, often by thickening, structuring, or strengthening the interfacial layer.

Film former

Creates a continuous film on skin or hair to improve wear, water resistance, transfer resistance, shine, or hold in sunscreens, makeup, and styling products.

Viscosity controlling agent

Adjusts thickness to the desired level for stability and usability, improving dispensing, suspension, and texture across many formulation types.

Gel forming

Builds a gel network to increase viscosity and structure, improving suspension, spread, and stability in serums, gels, and some emulsions.

Benefits

Enhances product texture for smooth, easy application in gels and lotions.

Stabilizes emulsions to maintain consistency and prevent separation over time.

Forms protective films that improve water resistance and wear in sunscreens and moisturizers.

Who It's For

A quick guide for who this ingredient may suit (and who should be cautious).

Who May Benefit	Who Should Avoid
People seeking stable, non-dripping serums and gels for daily routines.	Individuals with rare sensitivities to acrylic polymers.
Those preferring lightweight, clear formulations that absorb quickly.	People preferring all-natural, polymer-free formulations.
Users of water-based products wanting improved spreadability and hold.	Those experiencing irritation from high-molecular-weight thickeners.

Safety Notes

Rated low hazard by EWG with no known health concerns in cosmetics.
Non-comedogenic, unlikely to clog pores or cause breakouts.

Frequently Asked Questions about Sodium Carbomer

What is Sodium Carbomer made from?

It is a crosslinked acrylic acid polymer neutralized with sodium to form a water-swellable thickener.

Is Sodium Carbomer safe for sensitive skin?

Yes, it has low irritation potential and is widely used in gentle formulations.

Does it make products feel heavy?

No, it creates lightweight, transparent gels that spread easily without residue.