Sieves, standard

Sieves, Standard for Testing Purposes , FedSpec RR-S-368b (1959) 16) D.R. Eigsti R.D. 

A sieve diameter is defined as the width of the minimum square aperture through which the particle will pass. A common sizing device associated with this definition is a series of sieves with square woven meshes. Two sieve standards, i.e., Tyler Standard and American... 

International sieve standards available from the International Organization for Standardization, Geneva are ISO 3310-1 for wire cloth [19], ISO 3310-2 for perforated plate [20], and ISO 3310-3 for electroformed [21]. 

Figure 4.2 Cumulative size distribution for wet sieved standard strong cation resin (Hform)...

TABLE 11 Sieve Standards Specified by USP and Tyler (Continued)... 

What materials does NIST use for its reference sieve standards ... 

Table I presents some of the different international sieve standards and the corresponding sieve types (8). Several sieve aperture progression ratios are commonly available, depending on the different international standards. In the United States, a progression ratio of 21/2 is used. This ratio corresponds to successive particle groups of 2 1 in terms of particle...

Figure 7 Mean volume density distribution function q(x) of 10 split samples, measured by wet sieving, standard deviation s and variation coefficient v of the density Unction...

Grateful acknowledgment is hereby made of an indebtedness to those who have contributed to previous editions and whose compilations continue in use in this edition. In particular, acknowledgment is made of the contribution of L. P. Buseth, who prepared the conversion tables for the thirteenth edition and who prepared the table on the U.S. Standard Sieve Series. 

Health and Safety Factors. Sulfur hexafluoride is a nonflammable, relatively unreactive gas that has been described as physiologically inert (54). The current OSHA standard maximum allowable concentration for human exposure in air is 6000 mg/m (1000 ppm) TWA (55). The Underwriters Laboratories classification is Toxicity Group VI. It should be noted, however, that breakdown products of SF, produced by electrical decomposition of the gas, are toxic. If SF is exposed to electrical arcing, provision should be made to absorb the toxic components by passing the gas over activated alumina, soda-lime, or molecular sieves (qv) (56). 

Specifications and Analysis. R%-MaHc acid that is sold in the United States meets the specifications of the Food Chemicals Codex and National Formulary, which are Hsted in Table 5 (40,41). MaHc acid is available in the following U.S. standard sieve sizes ... 

Particles smaller than 44 p.m (—325 mesh) are called fines 44 p.m is the finest sieve used on a large-volume basis (U.S. Standard). Size determination of fines is described elsewhere (10,11). 

Species separated by molecular sieving effects when kinetic diameters fall iato different zeoHte aperture size categories (standard molecular sieve diameters = 300, 400, 500, 800, 1000,1300 pm. 

Particle-SiZe Distribution. Particle-size specifications for sugar are not usually a part of the legislated standards, but they are of concern to commercial users and suppHers and are often specified in contracts. Grain-size distribution is determined by using a series of sieves, either hand-sieved or machine-sieved (13). 

In the United States, a number of physical tests are performed on siUcon carbide using standard AGA-approved methods, including particle size (sieve) analysis, bulk density, capillarity (wettabiUty), friabiUty, and sedimentation. Specifications for particle size depend on the use for example, coated abrasive requirements (134) are different from the requirements for general industrial abrasives. In Europe and Japan, requirements are again set by ISO and JSA, respectively. Standards for industrial grain are approximately the same as in the United States, but sizing standards are different for both coated abrasives and powders. 

Product particle sizes vary from standard size of 6/14 mesh—U.S. Std. Sieves to mini-size granules of 10/16 mesh—U.S. Std. Sieves for small particle blends, to micro-size granules of 14/35-U.S. Std. Sieves for use on golf course tees and greens. Approximate mm corresponding to mesh sizes are 6 mesh/3.36 mm 10 mesh /2 mm 35 mesh/0.5 mm. 

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