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Hydroxypropyl Methylcellulose (HPMC) is a premium, chemically modified natural cellulose ether derived from plant sources. By grafting hydrophilic hydroxypropyl and methyl groups through a precise etherification reaction, HPMC achieves exceptional solubility and superior film-forming properties, making it an indispensable pharmaceutical excipient, particularly in the manufacture of high-quality hollow capsules.
Engineered to meet the stringent requirements of the 2020 Chinese Pharmacopoeia (Volume 4), our HPMC provides a safe, animal-free alternative to traditional gelatin. It is specifically designed to ensure chemical stability, rapid gastric dissolution, and excellent compatibility with a wide range of hygroscopic health foods and traditional medicinal ingredients.
Detailed Parameters
| Density | 1.39g/cm³ | Hydroxypropoxy (%) | 6.0-10.0 |
|---|---|---|---|
| Methoxy (%) | 27-30 | Loss on Drying (%) | ≤ 5 |
| Ignition Residue (%) | ≤ 1.5 | Heavy Metals (ppm) | ≤ 20 |
| Arsenic Salts (ppm) | ≤ 2 | Ethylene Oxide | Not detected |
| 2-chloroethanol | Not detected | Standard Compliance | CP 2020 (Vol 4) |
Key Advantages
100% Plant-Based
Free from animal proteins and fats, eliminating risks of BSE or foot-and-mouth disease.
Rapid Dissolution
Dissolves quickly in gastric acid to ensure efficient drug absorption and efficacy.
Chemical Stability
No cross-linking reactions with contents, ensuring long-term stability and safety.
Moisture Resistance
Low water content makes it ideal for hygroscopic and moisture-sensitive drugs.
Pure & Safe
No preservatives, no allergens, and no genetically modified substances used.
Taste Masking
Effectively covers the bitter taste of active ingredients for better patient compliance.
Product Gallery
Production Excellence
Raw Material Selection
Extraction of high-purity cellulose from premium wood or cotton sources.
Alkalinization
Low-temperature NaOH treatment to open cellulose hydrogen bonds.
Precision Etherification
High-pressure introduction of methyl chloride and propylene oxide.
Neutralization
Acid solution neutralization and multi-stage water washing for purity.
Drying & Crushing
Controlled moisture removal and precise particle size screening.
Quality Control
Strict testing for viscosity, substitution degree, and pharmaceutical purity.
Investment Return Comparison
| Performance Metric | Gelatin Capsules | HPMC Capsules |
|---|---|---|
| Source Material | Animal-derived | 100% Plant-based |
| Chemical Stability | Prone to cross-linking | Highly stable / No cross-linking |
| Dissolution Speed | Standard | Up to 10% Faster |
| Dietary Suitability | Limited (Non-Vegan) | Universal (Vegan/Halal/Kosher) |
| Moisture Sensitivity | High risk of brittleness | Excellent protection |
Frequently Asked Questions
Q: What is the primary advantage of HPMC over gelatin for capsules?
HPMC is plant-based, eliminating risks associated with animal diseases (like BSE) and making capsules suitable for vegans and vegetarians while offering superior chemical stability.
Q: How should HPMC powder be dissolved to avoid agglomeration?
Stir and disperse with hot water (above 80°C) first, then cool to room temperature or add cold water while stirring quickly to ensure a smooth solution.
Q: Is HPMC compatible with moisture-sensitive medications?
Yes, HPMC has very low water content and provides a strong protective barrier against moisture and oxygen, preventing delayed disintegration during storage.
Q: What are the storage requirements for HPMC powder?
HPMC should be stored in a sealed, dry place, protected from direct sunlight, rain, and moisture to maintain its physicochemical properties.
Q: Does HPMC react with the active pharmaceutical ingredients (APIs)?
HPMC is known for its strong chemical safety and stability; it does not react with most contents and avoids the cross-linking reactions common in gelatin.
Q: How can I remove bubbles from an HPMC solution?
Bubbles can be removed by letting the solution stand for 2-12 hours (depending on consistency) or by using vacuuming or pressurizing equipment.
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