Povidone (PVP), a cornerstone polymer in pharmaceutical and cosmetic formulation, is available in various grades, each defined by its K-value. This K-value is not merely a label; it directly corresponds to the polymer's molecular weight and, consequently, its viscosity and performance characteristics. Understanding the distinctions between Povidone K90, K30, K25, and K17 is crucial for formulators and procurement specialists aiming to optimize their product development. As a leading manufacturer and supplier of high-purity Povidone in China, we are here to guide you through these differences.

The K-value of Povidone is determined by its viscosity in a 2% aqueous solution at 20°C. A higher K-value indicates a higher molecular weight and thus a greater intrinsic viscosity. The grades commonly encountered are:

Povidone K90: This grade represents the highest molecular weight and viscosity within the standard range. Povidone K90 is an excellent binder for tablets, offering strong adhesion that improves tablet hardness and reduces friability. It is also used as a thickener in various liquid formulations where high viscosity is desired. Its robust binding capacity makes it ideal for challenging granulation processes.

Povidone K30: Positioned in the mid-to-high range, PVP K30 offers a balanced profile of binding strength and viscosity. It is widely used in tablet manufacturing for both wet granulation and direct compression, providing good flowability and compressibility. In cosmetic applications, it serves as an effective film-former and thickener, contributing to the desired texture and hold in hair styling products and skin care lotions.

Povidone K25: This grade provides a moderate viscosity, making it suitable for a broad spectrum of applications. In pharmaceuticals, it is used as a binder and dispersant. For cosmetics, PVP K25 is valued for its film-forming properties in hair care products and its thickening capabilities in creams and lotions. Its versatility makes it a popular choice for formulators seeking a good balance of properties.

Povidone K17: As the lowest molecular weight grade, Povidone K17 exhibits lower viscosity. It is often used as a binder in applications where lower viscosity is preferred, such as in some coating formulations or as a solubilizing agent. In cosmetics, it can act as a dispersing agent and contribute to lighter film formation.

Choosing the correct Povidone grade depends heavily on the specific application requirements, including desired viscosity, binding strength, film properties, and compatibility with other ingredients. Sourcing high-purity Povidone K series from a reliable manufacturer in China ensures that you receive materials with consistent specifications, vital for reproducible product performance. We invite you to contact us to discuss your specific needs, request samples, and obtain competitive pricing for all Povidone grades. Let us be your trusted partner in sourcing quality Povidone.