Particle Size (Sieve Analysis) of Plastic Materials ASTM D1921

Particle Size (Sieve Analysis) of Plastic Materials ASTM D1921

ASTM D1921 test method deals with the particle size of plastic materials in the powdered, granular, or pelletized forms. It utilizes a dry sieving, with a lower limit of measurement to be 38 µm. Multiple and specific sieves are selected for test methods A and B, and the distribution of particle diameter and size are determined. SI units are considered to be standard.


    ASTM D1921 test method measures particle size distribution which is important in lot-to-lot uniformity. The handling and processing characteristics are determined and dealt with. Based on the calculations, the daily application of plastic materials is decided.

    Test Procedure:

    Sieves should be sufficient to cover the particle sizes and should be coated such that the coarsest sieve is on top and the pan is on the bottom. Weigh the sample and shake it on a mechanical sieve shaker. Next, weigh each sieve with the material separately. The net weight of the material retained on the sieves can be measured by subtracting it from the total weight before.  

    Specimen Size : 

    The specimen size should be concerning the requirements such as 100 ±0.1 g.


    Mean particle size can be calculated as:
    Dₘ ꞊ Pᵢ Dᵢ/100
    Dₘ = mean particle diameter, µm
    Pi = material retained on sieve (or pan) , %
    Di = average particle size of material on a sieve, µm.


    Core Materials Testing Services


    A variety of microscopy and spectroscopy tools available for precise measurements from the nano to the meter scale.

    Metrology Testing Services


    TEM SIMS Profilometry

    Materials Testing

    ASTM and ISO standard and custom chemical, mechanical, thermal, corrosion tests, etc. for all materials metals, ceramic or polymers.

    Materials Testing Services


    Nondestructive Testing Electrical Testing Chemistry Analysis

    Product Testing

    Thousands of tests for product quality and reliability under heat, humidity, temperature shock, vibration, drop, electrostatic discharge.

    Product Testing Services


    Vibration Testing Humidity Testing Accelerated Aging

    Looking for Material Testing?

    We have 500+ Material Test already Done for top companies

      Send us a request

        idea icon

        Want to connect with an expert before you leave?