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Iranian Pisatchio Standards

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Iranian Pistachio Standards

Institute of Standards and Industrial Research of Iran (ISIRI) defines standards for the following Iranian pistachio products:

  • In-Shell Pistachio Nuts: ISIRI 15 4th revision
  • Mechanically Opened Pistachio Nuts: ISIRI 4919 1st revision
  • Closed Shell Pistachio Nuts: ISIRI 4921 1st revision
  • Pistachio Kernels: ISIRI 218 4th revision
  • Split Pistachio Kernels: ISIRI 3639 1st revision
  • Green Peeled Pistachio Kernels: ISIRI 4631 1st revision
  • Pistachio Oil: ISIRI 6655 no revision
  • Pistachio Paste: ISIRI 5691 no revision
  • Pistachio Powder: ISIRI 9636 no revision

The following table contains an abridged version of specifications for the five pistachio grades set out by ISIRI Standard 15 (4th Revision January 2009) for in-shell pistachio nuts (including raw dried and roasted pistachios):

Grades: Superior Grade Excellent Grade Grade 1 Grade 2 Grade 3
Grades: Superior Grade Excellent Grade Grade 1 Grade 2 Grade 3
Shell Defects (%)
(allowable tolerances by weight)
Closed shell and blanks 1 2 3 4 5
Blanks 0.5 0.75 0.75 1 1
Adhering hull 0.5 0.75 1 1.25 1.5
Stained shell 1 1.5 4 5 6
Deformity (incl. opened from bottom) 1 2 3 5 6
Slightly open in-shell 5 10 18 25 N/A
Total shell defects 7 13 22 28 N/A
Kernel Defects (%)
(allowable tolerances by weight)
Loose kernels 1 2 2.5 3 3.5
Pest damage 3 4 5 5 6
Obvious pest damage 1 2 3 3 3
Total kernel defects 3 4 5 6 7
Other Defects (%)
(allowable tolerances by weight)
Foreign material 0.5 0.3 0.4 0.6 0.8
Foreign material excluding shells 0.2 0.2 0.25 0.25 0.3
Non-uniformity of variety 1 2 3 4 5
Non-uniformity of size 1.5 1.6 1.8 2 2.4

Maximum Allowable Moisture Content: For raw dried pistachios: maximum 5% free water content, and for roasted pistachios: maximum 3% free water content.

Some Definitions:

Foreign material: Glass, metal and live insects are considered completely prohibited foreign materials. Acceptable foreign materials are pistachio related debris such as hull, stems, shells and sand.

Variety: Iranian pistachios are categorized into two categories according to their shape: long pistachios, where the ratio of the length to the largest diameter is more than 1.52; and round pistachios, where the ratio of the length to the largest diameter is less than 1.52.

Non-uniformity of variety: The percentage of round pistachios in a sample of long pistachios or vice versa.

Non-uniformity of Size: Ratio of the total weight of the 10 largest nuts in a sample of 100 nuts to the weight of the smallest 10.

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