General Info
ZRCI SI-HARD Rigidizer Hardener is a alkaline, aqueous dispersion of colloidal silica at 50% concentration. The dispersed silica is present as amorphous spheres, 100 nanometers in size. The silica present is non-agglomerated and is completely dispersed. There is no mixing or dilution required. The particles carry a slightly negative charge and have a large surface-to-weight ratio.
It is used for rigidizing and hardening the surfaces of ZIRCAR ceramic textile, papers and blankets. It also is ideal as a coating agent and binder.
SI-HARD is easily applied by brushing, rolling, dipping, sponging or spraying. It is non flammable. Coverage depends upon the desired hardness.
SI-HARD should be stored at temperatures between 5°C (41°F) and 32°C (90°F) to prevent irreversible precipitation of the silica.
Drying of treated parts can typically accomplished at temperatures of 150°C for one hour.
Properties
| Silica, wt. % |
50 |
|
Color |
White |
|
Particle Size (nm) |
100 |
|
pH |
9 |
|
Specific Gravity |
1.4 |
|
Viscosity, cP |
15 |
|
Stabilizing Ion |
Ammonium |
|
Na2O, % |
~0.12 |
|
Surface Charge |
Negative |
Composition
Used to Harden SB-2000 and SIL Cloths
Instructions
SUGGESTED APPLICATIONS
-
Coating surfaces of ZRCI textile, blankets and papers for improved hardness, abrasion & chemical attack resistance.
-
Forming of shapes (rigid tubes, boats, setters, supports, process fixtures etc.) by rigidization of flexible ZRCI materials.
-
Bonding agent in manufacture of ceramic fiber containing refractories, composites and laminates.
SI-HARD is used as a strengthening agent for ZRCI Refractory Sheet Products including:
-
Alumina-Silica Papers
-
SB-2000 Silica Blanket
-
Type SIL Silica Cloths
SDS (in PDF format)
Other Information
AVAILABILITY
Please call, fax or e-mail for pricing and availability.
| Item # | Description |
| LS50 | SI-HARD, 1 Gallon Bucket |
| LS51 | SI-HARD, 5 Gallon Bucket |
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.