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Particle Size Table (ASTM)

Sieving or screening is a method of separating a mixture or grains or more size fractions, the over sized materials are trapped above the screen, while undersized materials can pass through the screen.

To determine approximate mesh size of an activated carbon sample, Check the table below. Example, a carbon mesh size designated as US sieve 12 x 40 will fall through an opening of screen size 12 (1.70 mm) on the US scale and remain on a screen with an opening of screen size 40 (0.425 mm).

Sieves can be used in stacks, to divide samples up into various size fractions and hence determine particle size distributions.

  • All products are tested using ASTM Standard Test Method.

Size Equivalents

Two scales that are used to classify particle sizes are the US Sieve Series and Tyler Equivalent, sometimes called Tyler Mesh Size or Tyler Standard Sieve Series. The most common mesh opening sizes for these scales are given in the table below and provide an indication of particle sizes.