What Is a Test Sieve?

A test sieve is a standardized laboratory instrument consisting of a woven wire mesh or electroformed screen mounted in a rigid metal frame, manufactured to ASTM E11 or ISO 3310 specifications, and used to determine the particle size distribution of granular and powdered materials. Test sieves are the fundamental tool for verifying that raw materials, intermediate products, and finished goods meet particle size specifications in virtually every industry that handles bulk solids.

A standard test sieve analysis involves stacking sieves from coarsest at the top to finest at the bottom, placing the stack on a sieve shaker, loading a weighed sample onto the top sieve, and agitating for a standardized period. After shaking, the material retained on each sieve is weighed, producing a particle size distribution curve. This data directly informs production screening decisions — the mesh sizes selected for production vibratory screeners are typically chosen based on test sieve analysis results.

Test Sieve Standards Quick Reference

Why Test Sieves Matter in Vibratory Screening

Test sieves are the bridge between laboratory quality control and production screening:

• Selecting production mesh sizes — Test sieve analysis of raw materials determines which mesh sizes to install on production vibratory separators. Without accurate sieve data, operators are guessing at the correct screen specification.
• Verifying screening efficiency — By running test sieve analyses on both the oversize and undersize fractions from a production screener, operators can calculate screening efficiency and identify whether the vibratory separator is performing correctly.
• Quality control and compliance — Many industries require documented particle size distribution data for every batch. In GMP-regulated environments, sieve analysis records are part of the batch documentation.
• Troubleshooting screening problems — When a vibratory screener is not performing as expected, test sieve analysis of the feed, oversize, and undersize streams pinpoints the problem.

Test sieves are used alongside production vibratory screeners from Sweco, Kason, Midwestern Industries, Cleveland Vibratory, Russell Finex, Rotex, and ScreenerKing to ensure that screening operations meet specification.

Related Glossary Terms

• Mesh Size — The number of openings per linear inch in woven wire
• Particle Size Distribution (PSD) — The range of particle sizes in a sample
• Micron — The metric unit for screen opening measurement
• Electroformed Screen — Precision screen used in fine test sieves
• Bolting Cloth — Fine woven fabric for precision sieving
• Screening Efficiency — Percentage of undersize that passes through

Test Sieve FAQs

What is a test sieve used for?

A test sieve is used for particle size analysis in quality control and product development laboratories. Operators stack multiple test sieves from coarse to fine on a sieve shaker, place a material sample on the top sieve, and run the shaker for a standardized time. Each sieve retains particles larger than its aperture, and the weight retained on each sieve determines the particle size distribution of the sample.

What is the difference between ASTM E11 and ISO 3310 test sieves?

ASTM E11 is the North American standard, specifying aperture sizes and frame dimensions in the US mesh designation system. ISO 3310 is the international standard, specifying apertures in metric (microns and millimeters). The aperture sizes are harmonized at most common sizes. The primary differences are frame sizes (8-inch standard in ASTM, 200 mm in ISO) and designation conventions.

How often should test sieves be calibrated or replaced?

Test sieves should be inspected regularly and calibrated or replaced according to your quality management system. Most laboratories recertify annually or after a set number of uses. ASTM E11 defines compliance and verification grades with specific aperture tolerances. Sieves that no longer meet specification must be replaced to ensure accurate particle size measurements.