Alternate Names: Mulcoa 70 Calcined Grog, Mulcoa 70 Calcined Mullite
|If this formula is not unified correctly please contact us.|
|PCE - Pyrometric Cone Equivalent||39|
|BDGC - Bulk Density g/cc (Packed)||2.88|
|RC - Reheat Change||0% at 2800F, 0% at 2910F|
|APPO - Apparent Porosity||3.5%|
This material is produced from calcined mullite that is precisely sized through a series of screens and blended to obtain a series of coarse to fine sizes. During screening the grains are de-dusted. The product is used mainly for stucco and investment casting, in ceramics its main application is as a low expansion grog for bodies.
Mulcoa 47 and Mulcoa 60 are alternate products, these numbers refer to the approximate alumina content. Mulcoa 70 is thus the highest in alumina and therefore highest in mullite mineral (87%) and the lowest in glass. Mulcoa 47 is 65% mullite and 20% glass and 15% cristobalite (the others have no cristobalite).
Mulcoa 70 is the most refractory, Mulcoa 60 is 37 PCE and Mulcoa 47 is 35 PCE. Mulcoa 47 has a reheat change of 0.8% at 2800F and 3.1% at 2910F, Mulcoa 60 is zero for both.
Various grades for each are available in the following U.S.S. Sieve Mesh sizes:
10x18, 14x28, 16x30, 22S, 35S, 50S, 60S, 20x50, 35x80, 50x100, 60x200, 300S, 200 IC-C, 325 IC-C
Out Bound Links
A fibrous alumina silicate mineral of very low thermal expansion. Mullite is formed within porcelain bodies during firing and in industry by calcining.
In Bound Links
The calcining process is used to remove some or all unwanted volatiles from a material (e.g. H2O, CO2, SO2) and/or to convert a material into a more stable, durable or harder state. Varying temperatures are employed to calcine various materials, depending on the decomposition temperature of the vol...
A brick capable of withstanding high temperatures without deforming. 'Insulating firebricks' have the additional advantage of acting as good insulators due to the large pockets of air in the matrix of the brick. There are many different kinds of firebricks available. Although they might appear simil...