hydroxyethyl cellulose cas number

Hydroxyethyl Cellulose (HEC) A Comprehensive Overview

Hydroxyethyl cellulose (HEC) is a water-soluble polymer derived from cellulose, which is one of the most abundant organic polymers on Earth. It is extensively used in various industries, including pharmaceuticals, food, cosmetics, and construction, owing to its unique properties such as thickening, gelling, and film-forming abilities. The CAS number for hydroxyethyl cellulose is 9004-62-0, which is used to identify this specific chemical compound in databases and regulatory documents.

Structure and Properties

HEC is produced by the etherification of cellulose, where hydroxyethyl groups are introduced into the cellulose molecule. This modification enhances its solubility in water and improves its performance in various applications. The degree of substitution (DS) of hydroxyethyl groups affects its properties, such as viscosity and solubility. Higher degrees of substitution generally lead to greater viscosity and better thickening properties.

One of the notable features of HEC is its ability to form viscosity across a wide range of temperatures and pH levels. This property makes it exceptionally versatile in many formulations. Additionally, HEC exhibits good stability, which means it can maintain its performance under various environmental conditions, making it suitable for long-term applications.

Applications

1. Pharmaceuticals In the pharmaceutical industry, HEC is often used as a thickening agent, binder, and stabilizer in various formulations including creams, gels, and suspensions. Its ability to control the release of active pharmaceutical ingredients (APIs) makes it valuable in controlled-release formulations.

2. Food Industry In the food sector, HEC is utilized as a thickener, emulsifier, and stabilizer to improve the texture and stability of food products. It is commonly found in salad dressings, sauces, and dairy products, where it helps maintain consistency and prevents separation.

3. Cosmetics and Personal Care HEC is a popular ingredient in cosmetic formulations, being added to lotions, creams, shampoos, and conditioners. It enhances the texture and provides a pleasant feel on the skin or hair, ensuring a smooth application. Its film-forming properties can also aid in moisture retention.

4. Construction In the construction industry, hydroxyethyl cellulose is used in cement-based products as a water-retaining agent. It helps improve workability, enhances adhesion, and reduces cracking in mortar and plaster. This makes it crucial for ensuring the durability and longevity of building materials.

Environmental Impact and Safety

As a cellulose derivative, hydroxyethyl cellulose is derived from renewable resources, which aligns with sustainable practices in various industries. It is biodegradable and environmentally friendly. Additionally, HEC is generally recognized as safe (GRAS) by regulatory authorities, including the U.S. Food and Drug Administration (FDA), when used in food and pharmaceutical applications.

However, like any chemical substance, HEC should be handled with care. Skin and eye contact should be avoided, and appropriate safety measures, such as gloves and goggles, should be employed during handling and processing.

Conclusion

Hydroxyethyl cellulose (HEC) is a multifunctional polymer that plays a crucial role in various industries due to its unique properties. Its versatility as a thickener, stabilizer, and film-forming agent makes it an invaluable ingredient in pharmaceuticals, food products, cosmetics, and construction materials. The growing demand for natural and biodegradable alternatives continues to enhance its appeal, underscoring its significance in modern applications.

As industries continue to evolve, the importance of HEC will likely grow, driven by the increasing focus on sustainability and natural ingredients. Ultimately, hydroxyethyl cellulose stands out as a prime example of how modifications to natural substances can lead to innovative solutions across diverse applications.