Foundry

     

 

      

Surface defects in cast objects can be avoided through the addition of iron oxides to foundry sand. The iron oxide

 

• _Bayferrox^® 222

meets the requirement for a high iron oxide content with fine grain and at a reasonable price.

Iron oxide is used in black washes to prevent penetration and increase stability in sand molds and cores. Preferred products here are:

 

• _Bayferrox^® 120 and
• _Bayferrox^® 222

Iron oxides are used to provide color for the manufacture of feeders and cores. Examples of these are:

 

• _Bayferrox^® 920
• _Bayferrox^® 130 and
• _Bayferrox^® 318

Iron oxide (Fe2O3) undergoes an exothermic reaction with aluminum as an oxidizing agent (aluminothermic or thermite process). This enables the feeder to maintain the necessary temperature. Iron oxide is also used in foundry cores because of its reactivity. Coarse or fine products are available to meet different requirements:

 

• _Bayferrox^® 222 (coarse)
• _Bayferrox^® 110 (fine)