General Info
ZRCI AL-HARD Rigidizer/Hardener is used to increase the hardness of ZRCI Refractory Sheet products. AL-HARD is comprised of Aluminum Oxide and Phosphoric Acid in a water base. Refractory Sheet products treated with AL-HARD are ready for use after drying. When a chemical bond forms it hardens the fibrous material. The degree of hardening depends on the amount of AL-HARD used. AL-HARD is non-flammable and is not affected by freezing. It can be applied by immersing, spraying, brushing or sponging on many of ZRCI’s Refractory Sheet products.
AL-HARD is used as a strengthening agent for ZRCI Refractory Sheet Products including:
- RS-A MOLDABLE
- RS-CLOTH & RS-TAPE
- RS- MS MOLDABLE SLEEVING
Properties
|
Opaque White |
|
| Composition. % | |
| H20 |
68-75 |
| Al203 |
16-20 |
| H3PO4 |
9-12 |
| Specific Gravity, gm/cc |
1.2 |
| pH |
1.3 |
| Solids Content, % |
20 |
Composition
AFFECTS OF AL-HARD APPLICATION ON CHARACTERISTICS & PROPERTIES OF RS TYPE RS-A MOLDABLE
|
Treatment of A Moldable |
Dried* |
Fired** |
Hardened*** |
Hardened & Fired |
| Density (pcf) |
100 |
100 |
105 |
105 |
| Porosity |
40 |
40 |
38 |
38 |
| MOR, psi @ Room Temp. |
500 |
560 |
1330 |
665 |
| Compressive Resistance, psi @ 10% deflection |
1000 |
1400 |
2500 |
1500 |
| Durometer “D” |
50 |
55 |
70 |
70 |
| Pullout Strength, (lbs. on #10 sheet metal screw) |
30 |
50 |
90 |
55 |
*Dried to constant weight @100°C
**Fired for 1 hour @600°C
***Dried material treated with ZIRCAR AL-HARD @5wt% Pick-up
Instructions
APPLICATION INSTRUCTIONS
(On Refractory Sheet Type RS-A Moldable)
ZIRCAR AL-HARD Rigidizer/Hardener can be applied to A Moldable at a rate of up to 1 gallon/ 24in. x 72 in. roll. It can be applied at a lesser rate depending on the degree of hardening desired.
Before applying, dry RS-A Moldable at 100°C(212°F). Apply AL-HARD by immersing, spraying, brushing or sponging it on the surface of the dried product. Allow AL-HARD treated A Moldable to dry.
The following is a summary of the affect of AL-HARD application at a rate of 5% solids pick-up (approximately 1 gallon/roll).
SDS (in PDF format)
Other Information
Availability
Please call, fax or e-mail for pricing and availability.
| Item # | Description |
| LS01 | AL-HARD, 1 Gallon Bucket |
| LS02 | AL-HARD, 55 Gallon Drum |
PRICES ARE SUBJECT TO CHANGE WITHOUT NOTIFICATION AND ARE SUBJECT TO ZIRCAR REFRACTORY COMPOSITES, INC. TERMS AND CONDITIONS. ALL PRICES ARE F.O.B. FLORIDA, NY AND ARE IN U.S. DOLLARS