sand type, grain fineness number
and screen distribution have a significant affect on both erosion and core properties with finer sand, generally reducing core strength;
Can you give an example of how to calculate grain fineness number and detail why GFN is important?
Background: The AFS Grain Fineness Number (AFS GFN) is a measure of the average size of particles in a sand sample.
The base aggregate of the sand used by New Haven is a four-screen lake sand at 55 AFS grain fineness number (GFN) for molds and 48 AFS GFN for cores.
For incoming sand, the tests include 25-micron clay content, AFS grain fineness number and distribution, acid demand value (ADV) and pH.
sieve number curves, the core sand grain fineness number
(GFN) difference was revealed at 56.
divergence of WMS, UWMS and CS particles or agglomerates begins at 70,100 or 140 sieve sizes, increasing with AFS grain fineness number
Significance - The water content affects every property of green sand, with the exception of grain fineness number
of the base sand.