This silica sand is a three-screen sand with over 10% retention at the 70,100 and 140 meshes and an overall grain fineness number
of 82 (Figure 4).
Grain Fineness Number
(AFS GFN, Calculation)--AFS 11-6-00-S
Properties of the four sands including grain fineness number
(GFN), pH, acid demand value (ADV), and loss on ignition (LOI) are shown in Table 1.
14 True or False--Several sands can have essentially the same ZAFS grain fineness number
but different distributions.
The optimal grain fineness number
(GFN) in a sand system is determined by the type of metal poured, pouring temperatures, casting product mix (heavy vs.
Since North America has a wide variety of high quality silica sands available to the metalcasting industry, sands with an American Foundry Society grain fineness number
between 55 and 60 were used.
The AFS grain fineness number
for chromite sand and the amount of fines are dependent on sand grade.
Additional testing determined the influence of the American Foundry Society grain fineness number
(AFS-GFN) of commercially available silica sands.
This includes the grain fineness number
, surface area, thermal expansion, fusion temperature, pH difference and particle size distribution.
The grain fineness number
(GFN) and particle size distribution of the sand and additives also affect benchlife characteristics of mixed sand.