HPMC VS CMC: 7 Differences You Need to Know!

Melacoll&#;-09-13 13:29

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If you don't distinguish HPMC and CMC, there are 7 differences you need to know. HPMC vs CMC: their differences mainly focus on Definition, Solubility, Water Retention, Ph Stability, Enzymatic Resistance, Price and Application.

No.1 HPMC VS CMC: different definition

HPMC is prepared by reacting alkali cellulose with chloromethane and propylene oxide. This process mainly take place on etherification of workshop.  Carboxymethyl cellulose (CMC) is a cellulose derivative formed by the reaction of alkali and chloroacetic acid.

N0.2 different solubility

HPMC dissolves easily in cold water and may be difficult to dissolve in hot water. But CMC is easy to dissolve in hot and cold water, and the solubility of HPMC in cold water is higher than CMC.

No.3 different water retention

HPMC has better water retention than CMC. This is their big difference.

No.4 different PH stability

Melacoll&#; HPMC remains stable in the range of pH 3~11. However, PH has a great effect on CMC, it is mainly used in gypsum rather than cement.

In a strongly alkaline environment, CMC&#;s viscosity will be lost. But HPMC will speed up its dissolution rate and increase its viscosity.

No.5 different enzymatic resistance

HPMC has better resistance to enzymes than CMC, so HPMC solution is less easily degraded by enzymes.

No.6 different price

HPMC price is evidently higher than CMC.

No.7 different application

CMC mainly apply to the food industry, toothpaste, diet pills, water-based coatings, detergents, and others. CMC proved to be a viable and superior alternative to HPMC as a goniometer solution.  The most common applications of HPMC include tile adhesive, paints and coatings, gypsum products, putty, food, cosmetics, detergents, and eye drops, among others.

This  is 7 difference between HPMC and CMC. However, whatever any products, their impact is important. If you want to know HPMC and MHEC difference, please click here.

Carboxymethyl Cellulose (CMC) and Hydroxypropyl Methylcellulose (HPMC) are both cellulose derivatives, but they have distinct chemical structures and properties, leading to differences in their applications. Here are the key differences between CMC and HPMC:

1. Chemical Structure:

- CMC (Carboxymethyl Cellulose): CMC is derived from cellulose by introducing carboxymethyl groups onto the cellulose backbone. The carboxymethyl groups make CMC water-soluble.

- HPMC (Hydroxypropyl Methylcellulose): HPMC is synthesized by introducing hydroxypropyl and methyl groups onto the cellulose backbone. It is also water-soluble.

2. Solubility:

- CMC: CMC is readily soluble in water, forming a clear and viscous solution.

- HPMC: HPMC is soluble in water, and the solubility can be influenced by factors such as temperature and pH.

3. Application in Construction:

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- Both CMC and HPMC find applications in the construction industry, especially in the formulation of mortars, adhesives, and coatings.

- CMC: Often used for its water-retaining and thickening properties in construction materials.

- HPMC: Known for enhancing workability, water retention, and adhesion in construction formulations.

4. Viscosity:

- CMC: CMC can have a higher viscosity compared to HPMC, depending on the degree of substitution and other factors.

- HPMC: HPMC is available in a range of viscosity grades, allowing for control over the thickness of solutions or formulations.

5. Film Formation:

- CMC: CMC can form clear films, and it is used in some applications where film formation is desired.

- HPMC: HPMC can also contribute to film formation and is used in coatings and related applications.

6. pH Sensitivity:

- CMC: CMC is less sensitive to pH changes compared to HPMC.

- HPMC: The solubility and viscosity of HPMC can be influenced by pH conditions.

7. Applications in Food and Pharmaceuticals:

- Both CMC and HPMC find applications in the food and pharmaceutical industries.

- CMC: Used as a thickening and stabilizing agent in food products.

- HPMC: Used in pharmaceutical formulations and as a food additive for similar purposes.

8. Overall Characteristics:

- CMC is often chosen for its high water-holding capacity and rheological control.

- HPMC is selected for its improved workability, adhesion, and film-forming properties.

It's important to note that the specific application and formulation requirements will determine whether CMC or HPMC is more suitable for a given use case. Manufacturers often provide detailed specifications for each product to guide users in choosing the right cellulose derivative for their needs.

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