MaTestLab > Test Standards > ASTM D1921 Standard Test Methods for Particle Size (Sieve Analysis) of Plastic Materials
ASTM D1921 Standard Test Methods for Particle Size (Sieve Analysis) of Plastic Materials
ASTM D1921 test methods measure plastic material particle size in powdered, granular, or powdered forms using dry sieving, with a lower limit of measurement of 38 µm. ASTM D1921 test methods are used to determine particle size distribution and therefore are useful for determining lot-to-lot uniformity. The particle sizes of plastic materials affect the handling and processing characteristics of polymers. ASTM D1921 test methods use dry sieving so, the lower limit of measurement is considered to be about 38 μm and for smaller particle sizes, sedimentation test methods are recommended to be used.
GET STARTED
Introduction to ASTM D1921
The manufacturing and performance properties of plastics are greatly influenced by particle size. ASTM D1921 test methods can be used to determine particle size distribution and, as a result, are useful for evaluating lot-to-lot uniformity. The handling properties and maybe the processing properties of various polymers are impacted by the particle sizes of plastic materials.
There are two test methods, Test Method A and Test Method B, described in the ASTM D1921 Standard. Test Method A (the particle size distribution test) is conducted by cleaning and drying the sieves and pans, followed by weighing each sieve and arranging them in descending order. Test Method B is a version of Test Method A conducted in a testing lab with a few specific sieves and determines “percent passing” or “percent retained” on a given sieve. Test Method B in ASTM D1921 is applicable to materials which do not have a normal particle size distribution such as pellets and cubes.
ASTM D1921 Test Procedure
Specimen Selection
A representative sample of the tested plastic material is selected, large enough for analysis and accurately reflecting its composition.
Test Setup and Execution
There are two test methods, Test Method A and Test Method B, described in this standard. The particle size distribution test (Test Method A) is conducted by cleaning and drying the sieves and pans, followed by weighing each sieve and arranging them in descending order. The plastic material is then placed on the top sieve and covered. Subsequently, the stack is shaken to separate the particles based on their size. The material retained on each sieve, as well as the weight of the empty sieves and fines passing through the finest sieve, are measured. The percentage of retained material and fines is calculated, and a particle size distribution curve is created to represent the distribution of particle sizes in the plastic material. Test Method B is a version of Test Method A conducted with a few specific sieves and determines “percent passing” or “percent retained” on a given sieve.
ASTM D1921 Test Specimens
Specimen Details
Particle size analysis of plastic materials requires collecting enough material to represent the entire lot, with varying weights for measurable results.
Specimen Dimensions
Specimen dimensions are not predetermined, as plastic material can be granules, pellets, or powders; preparation or processing may be necessary for accurate results.
ASTM D1921 Test Results
The particle size distribution curve, derived from test data, visually represents particle distribution across different size ranges in plastic material. It is crucial for quality control, material characterization, process optimization, and material selection. Manufacturers use this data to ensure consistency, uniformity, and high-quality end products. Researchers use it to understand material behavior and performance during processing and application.
Tests Related to ASTM D1921
Important tests relevant to ASTM D1921 include ASTM E11 (Specification for Wire-Cloth Sieves for Testing Purpose), ASTM E691 (Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method).
You can share your astm d1921 testing requirements with MaTestLab. MaTestLab has a vast network of material testing laboratories, spread across the USA and Canada. We support your all material testing needs ranging from specific astm d1921 test to various testing techniques.
How much do I need to pay for the astm d1921 test?
Please contact us for a detailed quote for your astm d1921 testing needs. Cost incurred to carry out different astm d1921 testing methodology depends on the type of raw material; number of samples, coupons, or specimens; test conditions, turn around time etc. Costs of some ASTM testing methods start from $100 and the final value depends upon the factors listed above. Please contact us for the best and latest prices.
How many samples are required for astm d1921?
The required number of samples or specimens should comply with the procedure given in the astm d1921 standard. However, the MaTestLab operations team can assist you for your special requirements once you share your testing details with us.
How much discount can I get on the astm d1921 test?
MaTestLab has a vast testing laboratory network, hence we bring you the best testing facilities in a cost-effective way. We offer considerable discounts (15-20%) to our returning customers based on test volume and frequency.
How many days will it take to complete the astm d1921 test?
The turnaround time for astm d1921 test methodology depends upon the test procedure mentioned in the standard test document. However, we at MaTestLab understand your research requirements and hence try to get your test completed within the least possible time.
Where can I get the astm d1921 tested?
You can share your astm d1921 testing requirements with MaTestLab. MaTestLab has a vast network of material testing laboratories, spread across the USA and Canada. We support your all material testing needs ranging from specific astm d1921 test to various testing techniques.
MaTestLab Inc. offers accessible, quick, and affordable material testing, product testing, and failure analysis services. We support your on-demand testing and expert consultation needs with the help of our extensive network of material testing laboratories situated in the US and other parts of the world.
MATERIAL TESTING
We offer destructive and non-destructive tests over a range of mechanical, electrical, chemical, thermal, optical, corrosion, radiation, and biological testing methodologies defined by ASTM, ISO and other organizations.
PRODUCT TESTING
We help you evaluate and ensure your product quality and performance with standard and custom-made testing solutions. All the tests are done at well-equipped testing laboratories using standard testing methods for best output and satisfaction.
FAILURE ANALYSIS
Failure analysis ensures high levels of quality in every manufacturing process. We help you with getting the best failure or root cause analysis to determine the cause of the failure. The results help you identify means to prevent failure recurrences.
