Grefpatch-85 Patching Plaster (3000ºF 84% Alumina Patching Plaster)

85% Alumina, Phosphate-Bonded Patching Plaster

Specifications

Approximate Chemical Analysis (Calcined Basis)Alkalies (Na2O+K2O) - 0.4%
Alumina (Al2O3) - 83.7%
Iron Oxide (Fe2O3) - 1.0%
Phosphorus Pentoxide (P2O5) - 2.8%
Silica (SiO2) - 10.2%
Titania (TiO2) - 1.9%
Material Required ( g/cm³ )2.80
Material Required ( lb/ft³ )175
Bulk Density After 450ºF (230ºC) ( g/cm³ )2.68
Bulk Density After 450ºF (230ºC) ( lb/ft³ )167
Bulk Density After 2500ºF (1370ºC) ( g/cm³ )2.60
Bulk Density After 2500ºF (1370ºC) ( lb/ft³ )161
Bulk Density After 3000ºF (1650ºC) ( g/cm³ )2.72
Bulk Density After 3000ºF (1650ºC) ( lb/ft³ )170
Modulus of Rupture After 450ºF (230ºC) ( MPa )11.0
Modulus of Rupture After 450ºF (230ºC) ( lb/in² )1600
Modulus of Rupture After 2500ºF (1370ºC) ( MPa )12.4
Modulus of Rupture After 2500ºF (1370ºC) ( lb/in² )1800
Modulus of Rupture After 3000ºF (1650ºC) ( MPa )6.9
Modulus of Rupture After 3000ºF (1650ºC) ( lb/in² )1000
Hot Modulus of Rupture at 2700ºF (1480ºC) ( MPa )3.1
Hot Modulus of Rupture at 2700ºF (1480ºC) ( lb/in² )445
Cold Crushing Strength After 450ºF (230ºC) ( MPa )24.8
Cold Crushing Strength After 450ºF (230ºC) ( lb/in² )3600
Cold Crushing Strength After 2500ºF (1370ºC) ( MPa )103.4
Cold Crushing Strength After 2500ºF (1370ºC) ( lb/in² )15000
Cold Crushing Strength After 3000ºF (1650ºC) ( MPa )55.8
Cold Crushing Strength After 3000ºF (1650ºC) ( lb/in² )8100
Permanent Linear Change After 450ºF (230ºC) ( % )-0.5
Permanent Linear Change After 2500ºF (1370ºC) ( % )+1.1
Permanent Linear Change After 3000ºF (1650ºC) ( % )+0.2
Pyrometric Cone Equivalent38
Adhesion Test1/8-inch Thick, After 2900ºF (1595ºC) :- Will not peel

Note

The test data shown are based on average results on production samples and are subject to normal variation on individual tests. The test data cannot be taken as minimum or maximum values for specification purposes. ASTM test procedures used when applicable.

Features

  • Formulated for application by trowel or by hand.
  • Will not shrink or crack on heatup.
  • Resists metal and slag erosion.
  • Can be used on hot surfaces.

Uses

  • Metal and non-metal contact areas which have spalled or eroded.

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