Description
1. It was considered desirable to have a set of sieves in which screen apertures had some sort of a relationship to one another.
2. As early as 1867, Rittinger suggested root two as the ratio between the aperture widths of two adjacent sieves.
3. Later, in 1879, Renard suggested a preferred number series based on roots of 10, which were called preferred or Renard numbers.
4. The R-40 series has been found quite useful as it was possible to find a common ground between the various national standards.
5. R-40/3 has a step ratio of 1.1885 which closely corresponds to the fourth root of two(1.1892).
6. It is recommended that the ISO principal sizes should be used wherever possible, but if a closer series is required, it should be drawn from one of the alternative supplementary series R 20 or 40/3, but not from both.
7. I.S:460 follows the R 40/3 series of preferred nos, and ranges from 125mm. down to 22.um.
Available Models:
1. Test Sieves G.I Sheet- 300 MM Dia.
2. Test Sieves G.I Sheet- 450 MM Dia.
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