Carbomer vs Carbopol and Carbopol U20 vs U21

Carbomer is the general chemical name for a family of polymers used as thickeners, suspending agents, and stabilizers. Carbopol is a registered trademark name by Lubrizol for their specific range of carbomer polymers. So, Carbopol is essentially a brand name for a type of carbomer.

Regarding the difference between Carbopol 20 and Carbopol 21 (equivalent to Carbomer U20 and Carbomer U21 in our product range), the key differences lie in their dispersion properties, electrolyte tolerance, and recommended usage:

• Carbomer U20 (equivalent to Carbopol Ultrez 20):

  • Dispersion: Easy and quick to disperse in water; does not require long soaking.
  • Electrolyte Tolerance: Has good resistance to electrolytes.
  • Mixing: Requires pH adjustment to 6-7 using an alkali like Triethanolamine for thickening. Avoid high-speed blending (>2500 rpm) to prevent polymer damage.
  • Usage Rate: Typically used at 0.5-3%.

• Carbomer U21 (equivalent to Carbopol Ultrez 21):

  • Dispersion: Self-wetting properties make it easy to disperse.
  • pH Range: Works effectively over a wide pH range (5-11).
  • Mixing: Does not require heat. Can be used as a defoamer at 0.1%. Recommended for achieving clear texture, especially in formulations with high ethyl alcohol content, where neutralization with AMP (2-Amino-2-methyl-1-propanol) is suggested.
  • Usage Rate: Typically used at 0.1-2%.

In summary, Carbomer U20 is known for its easy dispersion and electrolyte tolerance, while Carbomer U21 is self-wetting and works across a wider pH range, making it more versatile in certain formulations, particularly those with high alcohol content or requiring a broad pH stability.