For formulators and R&D scientists, selecting the appropriate Carbomer grade is a crucial step in achieving desired product characteristics. Carbomer 940 and Carbomer 980 are two of the most commonly used cross-linked polyacrylic acid polymers, both offering excellent thickening and gelling properties. However, subtle differences in their manufacturing and residual characteristics can influence their suitability for specific applications. As a knowledgeable manufacturer and supplier, we aim to clarify these distinctions to help you make the best choice for your formulations.

Understanding the Carbomer Family

Both Carbomer 940 and 980 are high-molecular-weight polymers of acrylic acid, cross-linked with allyl ethers of pentaerythritol. This cross-linking creates a three-dimensional network that allows them to absorb water and swell significantly, leading to increased viscosity and gel formation upon neutralization. Their primary functions include thickening, stabilizing, and suspending ingredients in a wide range of products.

Key Distinctions: Carbomer 940 vs. Carbomer 980

  • Manufacturing Process & Residuals: Carbomer 940 is often produced using a solvent process that may leave trace amounts of benzene, a known carcinogen. While these levels are typically very low and within regulatory limits for many applications, Carbomer 980 is often manufactured using a different process (or has additional purification steps) that results in significantly lower or negligible residual benzene content. This makes Carbomer 980 a preferred choice for highly sensitive applications, especially in cosmetics and pharmaceuticals where consumer safety is paramount.
  • Viscosity and Performance: While both grades offer excellent thickening capabilities, there can be slight variations in their thickening efficiency and the final viscosity achieved at the same concentration. These differences are often formulation-specific and can depend on pH, electrolyte content, and other ingredients present. Generally, both are highly effective rheology modifiers.
  • Application Suitability:
    • Cosmetics: For products applied directly to the skin or hair, especially those marketed for sensitive consumers, Carbomer 980 is often preferred due to its lower residual benzene levels.
    • Pharmaceuticals: Similarly, in ophthalmic solutions, oral suspensions, or topical medications, Carbomer 980 might be selected for enhanced safety profiles, although Carbomer 940 can be used where regulations permit.
    • Industrial Applications: In many industrial settings where direct human contact is minimal, and strict regulatory oversight on residual solvents is less critical, Carbomer 940 may be a more cost-effective choice without compromising performance.

Choosing the Right Grade and Sourcing Strategy

When deciding whether to buy Carbomer 940 or 980, consider your target market, regulatory requirements, and formulation sensitivity. As a reputable Carbomer 940 manufacturer and supplier, we offer both grades and can provide detailed specifications to help you make an informed decision. It is always advisable to consult with your regulatory affairs team and conduct thorough testing to ensure the selected grade meets all necessary standards.

We encourage formulators and procurement managers to request a quote for both Carbomer 940 and Carbomer 980. Understanding the subtle differences will empower you to select the most suitable and safe ingredient for your innovative products. Partner with us for reliable supply and expert guidance.