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The percentage of an oil seal refers to its ability to effectively prevent leakage. A higher percentage indicates a better sealing capacity, with 100% being the ideal value. However, in reality, achieving a perfect seal is often challenging. Therefore, oil seals with percentages ranging from 25% to 35% are commonly used in applications where a high level of sealing performance is required.
4. Specialty Grades There are also specialty grades of HPMC developed for niche applications. For instance, HPMC with a low degree of substitution is used in controlled-release drug formulations, where precise release profiles are crucial. Additionally, HPMC can be modified to enhance its performance in specific applications, such as heat-resistance in food processing or improved water retention in agricultural products.
hpmc grades and uses
