Polyvinylpyrrolidone (PVP), also known as Povidone, is a water-soluble polymer that has found extensive use across various industries, most notably in pharmaceuticals and cosmetics. The 'K' value in PVP denotes its molecular weight and viscosity, with higher K values indicating higher molecular weights and increased viscosity. For manufacturers, understanding the distinctions between different PVP grades, such as K17, K25, K30, and K90, is crucial for optimizing product performance and achieving desired formulation outcomes. NINGBO INNO PHARMCHEM CO.,LTD., a leading manufacturer and supplier of PVP in China, provides this guide to help you make informed choices.

Understanding PVP K Values: What Manufacturers Need to Know

The K value of PVP is determined by its viscosity in a 2% aqueous solution, as defined by the Fikentscher equation. This K value directly correlates with the polymer’s molecular weight, influencing its properties and applications:

  • PVP K17 and K25: These lower molecular weight grades are typically used where a less viscous solution is desired. In cosmetics, they can act as film formers and rheology modifiers. In pharmaceuticals, they may serve as solubilizers for certain drugs or as flow enhancers for capsule filling. When looking to purchase PVP K17 or K25, consider applications requiring good solubility and moderate film formation.
  • PVP K30: This is one of the most widely used grades. It offers a good balance of viscosity and binding strength, making it an excellent binder for tablet granulation and direct compression. Its ability to improve the solubility and dissolution rate of poorly soluble drugs also makes it a preferred choice in pharmaceutical formulations. Manufacturers seeking a reliable binder and solubilizer will find PVP K30 to be a cost-effective and high-performing option.
  • PVP K90: With its significantly higher molecular weight and viscosity, PVP K90 is ideal for applications requiring strong binding, high viscosity, and enhanced solubilization capabilities. It is often used in extended-release pharmaceutical formulations and as a powerful stabilizer and thickener in cosmetic products. Its potent complexing ability makes it particularly effective in improving the bioavailability of challenging APIs.

Applications Across Industries

Each PVP grade possesses unique characteristics that lend themselves to specific applications:

  • Pharmaceuticals: As a binder (K30, K90), solubilizer (K30, K90), disintegrant aid, and stabilizing agent.
  • Cosmetics: As a film former, thickener, and stabilizer in hair care, skincare, and makeup (all grades, with K30 and K90 often preferred for stronger effects).
  • Industrial: In inks, coatings, membranes, and as a dispersant.

Your Trusted PVP Supplier in China

NINGBO INNO PHARMCHEM CO.,LTD. is committed to providing high-quality PVP grades, including K17, K25, K30, and K90, to manufacturers worldwide. We ensure that our products meet stringent quality standards and offer competitive pricing for bulk purchases. Whether you need PVP for pharmaceutical tablet production or advanced cosmetic formulations, we are your go-to supplier in China. Contact us today to discuss your specific requirements and learn how you can purchase the optimal PVP grade for your application.