Understanding the Choice Between 940 and 980 Grades

The choice between AC-Carbomer 940 and AC-Carbomer 980 is one of the most common formulation decisions that cosmetic developers face when designing carbomer-based products, and it is a decision that meaningfully affects finished product performance in ways that formulators and consumers can both perceive. While both grades share the fundamental carbomer chemistry and deliver excellent thickening, gel clarity, and suspension performance, they differ in specific performance characteristics that make each grade the better choice for particular application contexts and product positioning objectives. Understanding these differences enables formulators to make the optimal selection for each formulation project.

Viscosity Efficiency: The Primary Quantitative Difference

The most quantitatively important difference between AC-Carbomer 940 and AC-Carbomer 980 is viscosity efficiency — the viscosity achieved at a given concentration under comparable formulation conditions. AC-Carbomer 980 typically produces higher viscosity at equivalent concentration than AC-Carbomer 940, reflecting the higher molecular weight gel network that the 980 polymer architecture creates upon hydration and neutralization. In practical formulation terms, this means that formulators can achieve their target viscosity at lower 980 concentration than 940 concentration, or can achieve higher maximum viscosity with 980 than with 940 at the same concentration. This efficiency difference is typically in the range of 10 to 30 percent, varying with specific formulation conditions.

Suspension Performance Comparison

The suspension performance of the two grades also differs in ways that affect application selection for formulations that incorporate suspended materials. AC-Carbomer 980 generates higher yield stress at equivalent concentration compared to 940, providing stronger suspension of dense particles, larger oil droplets, and higher concentrations of dispersed materials. Formulations with demanding suspension requirements — high loading of dense exfoliating particles, high oil phase content in emulsions, large oil droplets from less stable emulsifier systems — benefit from the superior suspension of the 980 grade. Formulations with modest suspension requirements are adequately served by the 940 grade without the slight rate premium that the 980 grade typically carries.

Sensory and Texture Profile Differences

The sensory and texture profile differences between 940 and 980-based formulations are the most qualitative but often the most commercially important differentiating factor for product positioning decisions. Formulations with AC-Carbomer 940 tend toward firmer, more gel-like textures with a slightly more elastic character that consumers associate with structured gels. Formulations with AC-Carbomer 980 tend toward smoother, more fluid-feeling textures with a more silky application feel that consumers associate with premium skincare. For product lines positioned at premium price points where sensory performance is a key differentiator, the 980 grade's more sophisticated texture profile typically justifies its selection.

Clarity Performance Comparison

Both grades are capable of producing excellent gel clarity when properly prepared in low-electrolyte systems, and the clarity difference between well-prepared 940 and 980 gels in equivalent systems is minimal under normal formulation conditions. The selection between grades for clarity-critical applications is therefore typically not driven by clarity performance differences but by the viscosity and sensory performance differences discussed above. Formulators developing transparency-critical products who need to differentiate between the grades should evaluate their specific formulations empirically rather than relying on theoretical grade comparisons.

Application-Based Grade Selection Guide

The practical selection between AC-Carbomer 940 and 980 is best made by mapping the application requirements against the performance profile of each grade. Clear hand gels and standard facial serums where cost efficiency and proven performance are primary considerations favor the 940 grade. Premium facial serums, luxury moisturizing gels, and high-performance treatment products where sensory excellence and maximum suspension performance justify the grade premium favor the 980 grade. Formulations where compatibility with challenging ingredient systems is a primary concern may benefit from empirical comparison of both grades in the specific formulation system.

Expert Selection Guidance From ANECO

ANECO's technical team provides expert guidance for Carbomer 940 vs Carbomer 980 selection decisions based on detailed discussion of each formulation's specific performance requirements, target product positioning, and manufacturing considerations.