Selection

Capital Refractories has pioneered the recent use of gas diffusers in foundries. Capital has un-beatable quality and support.

The plug is best located below the surface of the lining.

Gas diffusers for use in induction furnaces are available in a range of qualities, sizes and fittings. The choice depends on the lining thickness. The standard range for induction furnaces is made with Caperdiff 94 AL (a high alumina quality) and stainless steel cans and are usually available from stock (except IF 6).

Gas Diffusers for Induction Furnaces

Gas Diffuser Model Lining Thickness
Name* Drawing No. / mm / INCH
MINI 7204 < 75 < 3
IF 1.5 7220 < 75 < 3
IF 2 7205 75 - 100 3 - 4
IF 3 7206 100 - 150 4 - 6
IF 4 7207 150 - 200 6 - 8
IF 5 7217 200 - 250 8 - 10
IF 6 7228 > 250 > 10

* The name: IF refers to induction furnace and the number is the nominal size in inches.

Duplex Gas Diffusers for Induction Furnaces

Gas Diffuser Model Lining Thickness
Name* Drawing No. / mm / INCH
IF 2 7235 75 - 100 3 - 4
IF 3 7236 100 - 150 4 - 6
IF 4 7237 150 - 200 6 - 8

Ladle gas diffusers

Gas Diffuser Model Specification
Drawing No. Diameter / mm Height / mm Pipe / mm Type
7129 95 104 50 Directional
7162 106 165 190 Directional
7121 100 206 110 Directional
7123 100 206 120 Permeable
7196 100 206 150 Permeable
7113 97 206 370 Permeable
7264 110 140 110 Permeable
7110 110 151 38 Permeable
7254 110 160 75 Permeable
7120 110 151 90 Permeable
7125 182 120 52 Permeable
7241 182 120 200 Permeable

Aluminium Furnace Gas Diffusers

Gas Diffuser Model Specification
Drawing No. Diameter / mm Height / mm Pipe / mm Can
7240 158 279 355 Stainless Steel
7119 158 279 371 Inconel
7229 158 282 Socket Stainless Steel
7232 229 340 45 Stainless Steel
7264 229 340 185 Short Can
7164 229 340 465 Stainless Steel
7127 229 340 685 Inconel

Miscellaneous Gas Diffusers

Gas Diffuser Model Specification
Drawing No. Diameter / mm Height / mm Pipe / mm Type
7232 46 64 37 Directional
7114 46 64 37 Permeable
7219 48 130 38 Permeable

To avoid confusion it is recommended to include the drawing number on any order.

Caperdiff 94 AL is one of a range of qualities designed for use The quality of the plug depends on the application.

Product Name Product Description
Caperdiff 94BN Pressed and fired high strength permeable chromia-enriched alumina diffuser for both ferrous and non ferrous application.
Caperdiff 94AL Pressed and fired permeable alumina diffuser for both ferrous and non ferrous application. A high strength product where mechanical damage (cleaning) may be an issue, together with a low pore size to give a finely dispersed bubble swarm.;
Caperdiff 90ALR Pressed and fired permeable alumina diffuser designed specifically for aluminium applications. A high strength product whose chemistry and physical properties have been modified to resist penetration by aluminium yet permit sufficient gas flow for effective treatment of the melt. Can be utilised for inert gas stirring or reactive purging with chlorine.
Caprax ASF DP A low cement, alumina-mag spinel directional or channel porosity diffuser, for application in steel ladles where there is an aggressive slag environment.