Agrochemicals

Sodium Carboxymethyl Cellulose (CAS No. 9004-32-4) 

1. Basic Information

• Chemical Name: Sodium carboxymethyl cellulose
• Synonyms: CMC; Cellulose gum; Carmellose sodium
• CAS Number: 9004-32-4
• Molecular Formula: [C₆H₇O₂(OH)ₓ(OCH₂COONa)ᵧ]ₙ
• Molecular Weight: Variable (typically 90,000–700,000 g/mol)
• Appearance: White to cream-colored powder
• Odor: Odorless
• Substitution Degree (DS): 0.6–1.0 (commercial grades)

2. Physical and Chemical Properties

• Melting Point: Decomposes before melting (~260°C/500°F)
• Density: 0.5–0.7 g/cm³ (bulk density)
• Solubility:
  • Water: Forms viscous colloidal solution
  • Organic solvents: Insoluble in ethanol, acetone, ether
• pH (1% solution): 6.5–8.5
• Viscosity (1% solution): 5–10,000 mPa·s (depends on grade)
• Moisture Content: ≤10% (as supplied)

3. Hazards (GHS Classification)

• Acute Toxicity: Not classified (Hazard statements generally not required)
• Skin/Eye Irritation: May cause mild irritation (H315/H319)
• Inhalation Risk: Dust may cause respiratory irritation (H335)
• Environmental Impact: Not hazardous (H420 not applicable)
• NFPA Rating: Health 1, Flammability 1, Reactivity 0

4. Storage and Handling

• Storage:
  • Keep in tightly sealed containers
  • Store in cool (<30°C), dry conditions
  • Protect from moisture caking
• Handling:
  • Use dust mask (NIOSH N95) when handling powder
  • Safety goggles recommended for bulk handling

5. Applications

• Food Industry: Thickener (E466), stabilizer in ice cream/sauces
• Pharmaceuticals: Tablet binder, viscosity modifier in syrups
• Personal Care: Toothpaste thickener, shampoo viscosity agent
• Industrial: Paper coating, textile sizing, oil drilling fluid additive

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