Standard sieves for ASTM are detailed in ASTM E11 and ISO 3310-1 standards.
These standards specify the requirements for woven wire sieves.
These sieves can separate particles ranging from 150mm (6in) to 5µm (0.0002in).
The separation medium for most sieves is metal or synthetic woven wire mesh.
The opening sizes range from 125mm to 20µm (5.0in to No.635).
5 Key Points to Know About ASTM Standard Sieves
1. Sieve Construction and Materials
Sieves are constructed using woven wire mesh, perforated metal plates, or electroformed mesh.
The choice of material depends on the specific requirements of the sample being tested.
Metal and synthetic woven wire mesh are commonly used due to their durability and precision.
2. Selecting the Right Sieve
The selection of a sieve is determined by industry-standard test methods or the operator's discretion.
It is crucial to choose a sieve that matches the size of the particles being tested.
3. Accuracy and Maintenance
ASTM E2427 outlines procedures for verifying the accuracy of sieves using SRMs.
SRMs are glass beads measured and sampled on equipment traceable to NIST.
By comparing the performance of a working sieve with a reference sieve, the accuracy can be determined.
This method helps in monitoring the sieve's performance over time.
4. Standard vs. Inspection Sieves
Compliance sieves have a statistical confidence level of 66% that their opening sizes and wire diameters meet ASTM/ISO requirements.
These are suitable for applications requiring a standard degree of accuracy.
Inspection sieves undergo more rigorous testing and have a 99% confidence level.
They are suitable for applications requiring a higher level of accuracy or documentation of accuracy.
5. Summary
Standard sieves for ASTM are designed to handle a wide range of particle sizes.
They are constructed from various materials to suit different testing needs.
Their accuracy is maintained and verified through the use of standard reference materials.
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