Curing agent SI-HARD

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. 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.