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Investment Casting Grades: Flours
 

Sieve Analysis:

 


U.S. Std. Sieve %

120F

200F

290F

325F

30

-

-

-

-

40

  -

-

-

-

50

<1

-

-

-

80

-

<1

-

-

100

<10

<1

-

-

140

-

<3

<2

-

200

-

<8

<5

<3

325

41-49

13-19

4-15

4-11

Pan

45-52

71-79

80-97

86-97

 Microtrac PM 50%   μm

 48-62 19-27 14-19 9-16

Magnetics ppm 

<50

<50

<50

<25

 

 

  

 

 

 

 

 

 

 

 

Physical Properties:

  Apparent Specific Gravity 2.18 – 2.20 g/cc

Thermal Properties:

  CTE Coefficient (20-700 °C) 0.5-0.6 x 10-6 /°C

Electrical Properties:

  Conductivity <5 μmhos

Chemical Composition:

  SiO2  >99.7   %
  Al2O3   <1,700 ppm
  Fe2O3 <280    ppm
  TiO2 <250    ppm
  K2O  <120    ppm
  CaO <75      ppm 
  Na2O <50      ppm