SYMPOSIA PAPER Published: 01 January 1959

Application of Electroformed Precision Micromesh Sieves to the Determination of Particle Size Distribution


Woven-wire sieves present a variety of problems to the petroleum refiner who tries to use them for the determination of particle size distribution of cracking catalysts. Not only are the sieves limited in the lower range to 44 μ, but they are inherently not sufficiently reliable for the measurements of these catalysts. The strongly entrenched popularity of the sieving procedure, due to its simplicity, prompted an investigation of a new product made by electro-forming nickel in meshes of precise square openings ranging from 15 to 105 μ. A satisfactory sieve has been developed and details of procedures for use established. These micromesh sieves are recommended as a primary standard for testing size distribution of cracking catalysts because of their highly precise openings, which can be reliably measured with a microscope, and because they are available in the range of interest.

Author Information

Daeschner, HW
Shell Development Co., Emeryville, Calif.
Seibert, EE
Shell Development Co., Emeryville, Calif.
Peters, ED
Shell Development Co., Emeryville, Calif.
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Developed by Committee: E29
Pages: 26–50
DOI: 10.1520/STP39289S
ISBN-EB: 978-0-8031-5662-3
ISBN-13: 978-0-8031-5661-6