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What is Ethyl Centralite ?

Ethyl Centralite (also known as Centralite I, Ethyl N,N'-diethyl-N,N'-diphenylurea, or 1,3-diethyl-1,3-diphenylurea) is a chemical compound primarily used in the explosives and propellants industry as a stabilizer for nitrocellulose-based propellants, such as smokeless powders and solid rocket fuels.

Chemical Information

  • IUPAC Name: 1,3-Diethyl-1,3-diphenylurea
  • Molecular Formula: C17H20N2O
  • Molecular Weight: ~268.36 g/mol
  • CAS Number: 85-98-3

    • Uses and Applications of Ethyl Centralite

    1. Stabilizer in Propellants and Explosives

    Prevents decomposition of nitrocellulose, which can lead to auto-ignition or detonation. Widely used in military and sporting ammunition.

    2. Plasticizer and Modifier

    Sometimes used in lacquers, plastics, and coatings to improve flexibility and thermal stability.

    Why Stabilizers Are Needed

    Nitrocellulose breaks down over time, releasing nitric acid and other reactive species. Stabilizers like Ethyl Centralite absorb these decomposition products, prolonging shelf life and reducing the risk of spontaneous combustion.

    Comparison with Other Stabilizers

    Stabilizer Relative Strength Volatility Common Use
    Ethyl Centralite Moderate Low Ammo propellants
    DPA (Diphenylamine) High Moderate Military-grade
    Akardite II Low-Medium Low Commercial uses
    MNA (Methylcentralite) Similar to EC Low European formulas

    Safety & Handling

  • Toxicity: Low acute toxicity, but chronic exposure should be avoided.
  • Precautions: Use PPE when handling; avoid inhalation or skin contact.
  • Environmental Impact: Not highly biodegradable; long-term environmental persistence is a concern.



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