R&D Scale :

R&B Scale comes from where steel billets are stored before 

they are hot-milled to become bars, concrete rods,.wires, etc. 

It was 45-mesh sieved, hence the specks at high concentrations.

Formula of the Base :

 Na2O  0.14    Al2O3  0.44     SiO2  3.38

K2O  0.14                               P2O5  0.00

MgO  0.00                              TiO2  0.00

CaO  0.72                               Fe2O3  0.00

Alumina:Silica ratio is  1.00:7.62

Neutral:Acid ratio is    1.00:7.63

Alk:Neut:Acid ratio is 1.00:0.44:3.38

Expansion: 76.1 x 10e-7 per degree C

Gris Glacé

Custer feldspar    25

Kona F-4    25

Whiting    20

EPK    10

Silica    20

Bentonite      1

R&B Scale      1

Gris/Vert Glacé

Custer feldspar    25

Kona F-4    25

Whiting    20

EPK    10

Silica    20

Bentonite      1

R&B Scale      2

Vert Moyen Glacé

Custer feldspar    25

Kona F-4    25

Whiting    20

EPK    10

Silica    20

Bentonite      1

R&B Scale      3

Vert Moyen Glacé

Custer feldspar    25

Kona F-4    25

Whiting    20

EPK    10

Silica    20

Bentonite      1

R&B Scale      4

Vert Moyen Glacé

Custer feldspar    25

Kona F-4    25

Whiting    20

EPK    10

Silica    20

Bentonite      1

R&B Scale      5