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80% passing calculation from lab test

by Vasudev Chari

The calculation to find the 80% passing from any sieve size passing is based on Gate-Gaudin-Schuman equation.

Example –1

If a material has 90% passing in 500 micron sieve, than 80% passing will be from

Example –2

If a material has 50% passing in 300 micron sieve, than 80% passing will be from

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