G 2T is an alumina based advanced ceramic refractory that has been specially formulated to provide superior resistance to abrasive wear, high temperature and corrosive environments. G 2T is an easily mixed powder that can be cast or hand applied for your most severe applications. The product is great for use in small repairs or large projects.
G 2T is shipped unbonded in a 55 lb bag and, when blended with water, G 2T becomes an excellent wear material for environments where weak acids and alkalis are present. It can be cast, hand packed or troweled in place. G 2T is an ideal material for use in cyclones, transfer lines catalysts, reactors and regenerators, refineries, transfer lines of coal and coke, wear plates, fans lining, etc.
|Description||Maximum Service Temperature||Cold Crushing Strength (ASTM C 133)||Porosity (ASTM C 20)||Bulk Density (ASTM C 20)||Abrasion Loss (ASTM C 704)|
|65-68% AI2 03||2200°F (1260ºC)||90-130 MPa @ 80° F
180-230 MPa @ 230° F
|16-20% @ 1500°F
15-19% @ 2000°F
|163 lbs/ft3 @ 1500°F||3 cm3 @ 1500°F|
Preparation of G 2T requires a suitable mixer with a defined quality of water. Mixing ratio of powder to water is critical.
1) A paddle/mortar type mixer is recommended for proper distribution of materials. In the event a small batch is being applied, a high power drill (minimum 1 h.p.) with a jiffler mixer can be used.
2) The mixer should be dry, clean and free from any dust, oil or contaminants.
3) Add the dry G 2T and stainless steel fibers (2% by weight of G 2T) into the mixer, and dry blend for one minute.
4) Add water (5-7% by weight of G 2T) to the dry G 2T. For a 55 lb bag, add 1/3 of a gallon of water to start. The mixing ratio is critical.
5) Mix for 9 to 11 minutes. Be patient!
6) Once the mixture is ready, the consistency should be like a smooth "peanut butter" in order to be applied on mesh. If a ball of the material is held in the hand, it should have very little "slump."
7) If after 11 minutes of mixing, the G2 T is too dry, add small amount of water. For a 55 lb bag, add no more than 1 cup of additional water.
8) The material may be applied on a hexmesh grid or standard wire mesh for extra support. It must be free from grease or any other contaminants.
9) The mix should be well packed during the applications, and make sure that the material fills all of the mesh so that there are no voids in the material.
10) The material should be cured for a period from 12 to 48 hours (at 70°F) before the material is subjected to service conditions. In colder temperatures, external heating may be required.
|Applied Thickness||Coverage (ft2)|
1) The surface should be free of grease and oil.
2) For small repairs, mix and trowel G 2T into damaged area.
3) For large repairs, install 16 ga 1″ x 1″ wire mesh. Tack weld nuts under wire mesh as spacers. Pour mixed G 2T over wire and trowel smooth. Wire mesh should be installed at the approximate center depth of the applied G 2T.
The addition of Stainless Steel Fibers to the G 2T mix provides the added benefits of outstanding spalling resistance, excellent fracture resistance and excellent thermal and mechanical shock resistance.
The use of Stainless Steel Fibers significantly increases the tensile strength of the G 2T mixture and greatly increases its energy absorption capability. The fibers act as a crack arrestor and form a mechanical bond even after any cracks occur. We recommend the use of fibers in most applications, to provide reinforcement of G 2T and therefore increase life and reduce maintenance costs. The proper amount of fibers to add to G 2T is proportional by weight. Add 2% fibers by weight of G 2T (100 lbs of G 2T calls for 2 lbs of fibers).
Note: Stainless fibers cannot perform above their oxidation temperatures. Consult with your St. Lawrence Application Specialist for the proper fiber for your application.