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Item # Grefpatch-85 (WET), Grefpatch-85 Patching Plaster (3000ºF 84% Alumina Patching Plaster)



85% Alumina, Phosphate-Bonded Patching Plaster




Specifications  · Physical Data (Typical)  · Note  · Features  · Uses

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%


Physical Data (Typical)

Material Required

175 lb/ft³
2.80
g/cm³

Bulk Density After 450ºF (230ºC)

167 lb/ft³
2.68
g/cm³

Bulk Density After 2500ºF (1370ºC)

161 lb/ft³
2.60
g/cm³

Bulk Density After 3000ºF (1650ºC)

170 lb/ft³
2.72
g/cm³

Modulus of Rupture After 450ºF (230ºC)

1600 lb/in²
11.0
MPa

Modulus of Rupture After 2500ºF (1370ºC)

1800 lb/in²
12.4
MPa

Modulus of Rupture After 3000ºF (1650ºC)

1000 lb/in²
6.9
MPa

Hot Modulus of Rupture at 2700ºF (1480ºC)

445 lb/in²
3.1
MPa

Cold Crushing Strength After 450ºF (230ºC)

3600 lb/in²
24.8
MPa

Cold Crushing Strength After 2500ºF (1370ºC)

15000 lb/in²
103.4
MPa

Cold Crushing Strength After 3000ºF (1650ºC)

8100 lb/in²
55.8
MPa

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 Equivalent

38

Adhesion Test

1/8-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.



 DOWNLOADS 

Data Sheet for Grefpatch-85 (WET)
(PDF, 22KB)


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