ISO 4621:1986
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Chrome oxide green pigments -- Specifications and methods of test

This standard was last reviewed* in 2012.

*ISO standards are reviewed every five years.


Specifies three grades, which shall not be in admixture with other colouring matter of organic or inorganic nature and shall be free from extenders. The pigment consists essentially of chromium(III) oxide (Cr2O3) in the form of a dry powder. Grade 1, these pigments shall contain a residue on a sieve of 45 nm mesh aperture of not more than 0,01 % (m/m); grade 2, under the same conditions, shall contain a residue of more than 0,01 % (m/m) and not more than 0,1 % (m/m) and grade 3 shall contain a residue of more than 0,1 % (m/m) and not more than 0,5 % (m/m).


  • Document published on: 1986-07-17
    Edition: 1 (Monolingual) ICS: 87.060.10
    Status: Published Stage: 90.93 (2012-04-02)
    TC/SC: ISO/TC 256 Number of Pages: 5
  • No revision information available

  • No corrigenda or amendments available

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