Carbomer 940 is an acrylic acid cross-linked resin obtained by cross-linking pentaerythritol and acrylic acid. It is an organic compound and a very important rheology modifier. After neutralization, carbomer is an excellent gel matrix and has thickening and suspension uses.

Different types of Carbomer

The advantage of Carbomer 940 is that it can produce colloids produced by high-viscosity permanent emulsions and suspensions. It has good transparency and short rheological properties. The viscosity reaches 63000MPA.S at 0.5%, which is suitable for products with high viscosity.
The advantages of Carbomer 934 are good thickening effect, strong shear resistance, and long-lasting stability at high viscosity, which is suitable for cream cosmetics.
Carbomer 980 has good thickening, high transparency, high viscosity, and strong suspension ability.

Carbomer

Item		Specification	Result
Appearance		Fluffy white powder	Pass
0.2% Aqueous solution viscosity (mPa·s)		19000~30000	23250
0.5% Aqueous solution viscosity (mPa·s)		40000~70000	60200
Residual Ethyl Acetate / Cyclohexane(%)		≤0.25	0.096
Residual Acrylic Acid (%)		≤0.50	0.31
0.2% Aqueous solution light transmittance (%)		≥85	94
0.5% Aqueous solution light transmittance (%)		≥85	95
Heavy Metals (mg/kg)	Hg	≤1	Pass
	As	≤2	Pass
	Cd	≤5	Pass
	Pb	≤10	Pass
Packing density (g/100mL)		19.5-23.5	Pass
Loss on drying (%)		≤2.0	Pass
Conclusion:		Meet the standard

Carbomer

1. Carbomer 940 has a special molecular structure and can absorb 400 to 500 times its own weight of water. As the polymer swells, the viscosity of the system increases, and the liquid becomes gel-like, thereby achieving the effects of thickening, suspension and stabilization.
2. It has a certain affinity with the skin and can protect the skin. Therefore, it can reduce the damage of irritating ingredients to the skin and mucous membranes and is suitable for personal care products.

3. As a bioavailability enhancer, it controls the release of the drug and improves its availability.

4. As a bioadhesive, it makes the formulation adhere more easily to the skin and mucous membranes.

What is carbomer 940 used for?

Carbomer is favored by cosmetic manufacturers due to its simple process and good stability. It is used in lotions, creams and gels.
Carbomer is also used in medicine:
(1) As a sustained-release material.
(2) As a carrier matrix for external drug formulations, it can be made into ointments, suppositories and gels. Its gelling, adhesive and film-forming properties can improve the bioavailability of drugs.

Generally, a conventional dosage of 0.25-0.5% of Carbomer can produce an efficient thickening effect, thereby preparing emulsions, creams, gels and transdermal preparations with a wide viscosity range and different rheological properties.

Carbomer