Place of Origin : Hengshui,China

What Is A Mid-Point Sieve?

A mid-point test sieve has had the mesh inspected. The sieve is then selected as a mid-point if the results give tolerances that are in the middle of the ASTM Standard. For example, the ASTM permissible variations for the mesh of a No. 40 sieve (425μ) are:

1:Average Opening ±19μ.
2:Opening Dimension of 396μ not exceeded by more than 5% of the openings.
3:maximum individual opening 502μ.

The mid-point would have a variation in Average Opening of ±9.5μ, o