CHT Group QSil 58

• Excellent thermal stability
• Self-leveling
• Variable cure speed
• Useful temper range of -54ºC (-65ºF) - 260ºC (500ºF) continuously and up to 316ºC (600ºF) intermittently

Mixing

• If using QSil Deep Section Catalyst as the curing agent, it should be thoroughly mixed prior to use.
• The base should be catalyzed by weight with the appropriate amount of curing agent. A concentration of 0.5% DBT catalyst or 10% QSil Deep Section Catalyst will provide a gel time of one hour and a cure time of 24 hours. Cure speed can be accelerated by adding DBT catalyst in increments of 0.1%.
• Material should be mixed in a clean, compatible metal or plastic container. The volume of the container should be 4 - 5 times the volume of the material to be catalyzed. Thoroughly mix using clean tools, scraping the bottom and the side of the container to produce a homogeneous mixture.

De-aeration

Air trapped during mixing should be removed to eliminate voids in the cured product. Vacuum de-airing may be necessary to completely remove all entrapped air bubbles. To ensure proper de-airing, subject the mixed material to 29 inches of mercury. When using this material for potting, a de-aeration step may be necessary after pouring to avoid capturing air in complex assemblies.

Deep Section Cure
Cured material should be properly conditioned prior to service if it is to be used in deep sections at temperatures over 150°C (32°F). Following room temperature cure of 1 - 3 days, a typical program would be eight hours at 50°C intervals from 100°C (212°F) to the service temperature. Longer times at each temperature will be required for larger parts of very deep sections.

Bonding

These rubber compounds require a primer to bond to non-silicone surfaces. Thoroughly clean the substrate with a non-oily solvent such as naphtha or methyl ethyl ketone (MEK) and let the surface dry. Then apply a uniform thin film of a suitable silicone primer to air dry for one hour or more.

Maximum storage temperature is 4.4 °C / 40 °F.