Hydroxypropyl Methylcellulose (HPMC), identified by CAS number 9004-65-3, is a critical polymer with a wide array of applications across industries like pharmaceuticals, construction, food, and cosmetics. Its functionality is heavily influenced by its specific grade, primarily determined by its viscosity and degree of substitution. As a dedicated HPMC manufacturer and supplier in China, NINGBO INNO PHARMCHEM CO.,LTD. provides a comprehensive range of HPMC grades to meet diverse industrial needs.

Understanding the different grades of HPMC is crucial for achieving optimal results in your formulations. The two primary parameters that differentiate HPMC grades are:

1. Viscosity: This typically refers to the viscosity of a 2% aqueous solution. It is measured in millipascals per second (mPa.s) or centipoise (cP). Lower viscosity grades are generally used where fluidity is desired (e.g., certain liquid formulations), while higher viscosity grades are preferred for thickening and binding applications.

2. Degree of Substitution (DS) and Molar Substitution (MS):

  • Methoxy Substitution (DS): Refers to the number of methoxy groups attached to the anhydroglucose unit of the cellulose backbone.
  • Hydroxypropoxy Substitution (MS): Refers to the number of hydroxypropoxy groups attached.

These substitution ratios, often represented by type numbers (e.g., Type 2208, Type 2910, Type 2910), influence HPMC’s solubility characteristics, thermal gelation temperature, and film-forming properties. For instance:

  • Type 2208 (e.g., 100 mPa.s): Typically indicates around 2.0-2.5% methoxy content and 5.0-8.0% hydroxypropoxy content. Different viscosity grades within this type are available.
  • Type 2910 (e.g., 50 mPa.s): Usually signifies around 2.7-3.1% methoxy content and 7.0-12.0% hydroxypropoxy content. Again, various viscosity grades exist.

Selecting the Right HPMC Grade for Your Application:

  • Pharmaceuticals: For tablet binding and controlled release, specific viscosity grades and substitution types are chosen to achieve the desired dissolution profiles and mechanical strength. In ophthalmic solutions, lower viscosity grades are often preferred for comfort. Always look for USP or EP compliant grades when you buy HPMC for pharmaceutical use.
  • Construction: Higher viscosity grades (e.g., 100,000 cP and above) are commonly used in mortars and tile adhesives for enhanced water retention and workability. The specific grade choice may depend on the desired rheological properties and setting times.
  • Cosmetics and Personal Care: Medium to high viscosity grades are typically used for thickening lotions, creams, and shampoos. Lower viscosity grades might be selected for hair styling products where a lighter film is desired.
  • Food Industry: Food-grade HPMC is selected based on the desired texture, thickening, and stabilization effects in products like sauces, desserts, and baked goods.

Working with a Reliable HPMC Supplier

Choosing the correct HPMC grade is essential for product performance. As a leading HPMC manufacturer and supplier in China, NINGBO INNO PHARMCHEM CO.,LTD. offers a wide selection of HPMC grades. Our technical team can assist you in identifying the most suitable product for your specific application. When you seek to buy HPMC, consider our competitive HPMC price in China and our commitment to quality assurance. We ensure that every batch meets rigorous specifications, providing you with a dependable raw material for your formulations.

By understanding these technical specifications and partnering with a knowledgeable supplier, you can effectively leverage the benefits of HPMC in your products.