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Quality control and units of nuts and dried fruits sizing

In order to commercialize the agricultural products some factors such as classification, size, type and quality grade of product are needed. As regards the different tastes in different countries so some of the determined factors are regional or internation.

 The most common factors of agricultural products used in most countries are as following:

Product Color, appearance, taste, moisturize, counting and sizing units and the impurity grade

Here it is briefly explained about each one. Of course there are so many other factors in standards of nuts and dried fruits sizing, but the most important ones are pointed out in this section.

color is a tact factor which is a based on the product type and the target market.

 The product uniformity in terms of color and size, and absence of impurities is one of the determining factors of the appearancestandard.

Fresh taste, crispness and not having unpleasant smells are the main factors to evaluate the product taste .ofcourse some of them differ depending on the product target market because of various sapous.


moisture percentage of the best quality of each type of raw nuts varies according to the standard. More or less than standard moisture value of each  agricultural product, causing damages (molding or drying or changing the appearance).

It is clear that the higher impurities in product analysis, the better quality. Generally, the impurities includes damaged, undeveloped, chopped and splits products, dust, stone, foreign material such as pieces of shell or skin and etc .

The most common quality controlling and sizing scales for nuts are Count, Kale, Ounce, size and type.


generally refers to number of product in a specified weight. It can update us about coarsens of product.It is used mostly for sunflower seeds, cashew, … .

For sunflower seed in this method, 50gr of seeds is weighted and counted .The obtained number is Count of sunflower seeds .If there are 274 pieces seeds in 50gram weighted so the count is 270-280. The most commonsunflower seed counts start 210-220 and changes to 330-340 in different types.

nut sizing
This scale of nuts and dried fruits sizingis commonly used to detect jumbo or small seeds. In this method we place 10 seeds in the width of side by side on the ruler.  The ruler index number indicates the seed size. This number is more commonly used to measure pumpkin and watermelon seeds, which varies between 6 and 15.


This measuring unit is a standard to determine the kernel percentage of walnuts, pistachios, Apricot, almonds, and so on. In this method 100 grams of in-shell product is weighted and then they are gotten the kernels out of their shells. The kernels weight is its Kale. For example if the kernels weight of 100 Grams weighted product is 48 grams so the product  kale is 48.In this method the best kale of a product is 50 grams and if it is less than 50 grams , so it shows that the product quality is lower.

This is another scale in nut industry to control the product quality. One ounce equals 28.3 grams and is used for pistachio and almond kernels commonly. For almond 85 grams (3 ounces) and for pistachio 142 grams (5 ounces) is weighted and counted. And the counted number is divided to 5 for pistachio and to 3 for almond .For example if the number of pistachio in 142 grams weighted one is 153 pcs, so the ounce of this pistachio is 30 ounces and 3 ones which is shown 30/32.

The most common ounces of pistachio are :18/20 , 20/22 , 22/24 , 24/26 , 26/28 , 28/30 , 30/32 , 32/34 , 34/36 and 36/38 .

The smaller ounce indicated the smaller shape.


The shape of product appearance is addressed type and it is mostly used for sunflower seeds now. For example types 5009, 601, 363.

nut sizing

Keywords: nuts and dried fruits sizing

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