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Physical Properties

CMC Physical Characteristics

Overview

Carboxymethyl Cellulose (CMC) is a white or slightly yellowish, odorless, tasteless powder that exhibits unique physical properties making it valuable across numerous industrial applications. Understanding these physical characteristics is essential for selecting the appropriate grade and optimizing its performance in specific applications.

Solubility

CMC is readily soluble in water, forming clear to slightly turbid solutions depending on grade and concentration.

  • Readily soluble in cold and hot water
  • Forms colloidal solutions
  • Insoluble in most organic solvents

Hygroscopicity

CMC exhibits hygroscopic properties, absorbing moisture from the environment which affects handling and storage.

  • Absorbs moisture from atmosphere
  • Moisture content typically 8-10%
  • Requires proper storage conditions

Film-Forming

CMC can form transparent, flexible films with good barrier properties when dried from solution.

  • Forms transparent films
  • Good oxygen barrier properties
  • Flexible and non-brittle

General Specifications

Property Typical Value/Range
AppearanceWhite to off-white powder
Particle Size80-120 mesh (typical)
Bulk Density0.5-0.8 g/cm³
Moisture Content≤10%
pH (1% solution)6.5-8.5
Degree of Substitution0.4-1.5 (varies by grade)

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