Overview of BISCO HT-6000 Series Silicones

The BISCO HT-6000 series silicones are a product line of high temperature adhesives, sealants and insulating materials developed and manufactured by BISCO. This product line is engineered for high performance in demanding industrial and aerospace applications that require exceptional resistance to extreme temperatures.

HT-6000 series silicones offer a number of key benefits:

• Withstand continuous use temperatures up to 343°C (650°F)
• Retain elastomeric properties at extreme temperatures
• Excellent chemical and fuel resistance
• Strong adhesion to metals, glass, ceramics and composite materials
• Low outgassing makes them suitable for high vacuum environments

Key Applications of BISCO HT-6000 Series Silicones

The BISCO HT-6000 series has been formulated for the following high temperature applications:

• Aircraft and aerospace components
• Industrial equipment exposed to high heat
• Electrical insulation in transformers, motors, generators
• Sealing exhaust, emission and combustion systems
• Bonding and sealing oven doors, furnaces, boilers

The outstanding thermal stability and flexibility of these silicone products make them an optimal solution for maintaining resilient seals, barriers and bonds in harsh operating environments. The series offers one and two-part silicone formulations for ease of application.

Overview of HT-6120 RTV Silicone Adhesive/Sealant

The HT-6120 is a one-part, ready-to-use silicone RTV (room temperature vulcanizing) adhesive/sealant that cures at room temperature when exposed to moisture in the air.

Key features and benefits of HT-6120:

• Withstands continuous temperatures up to 300°C (572°F)
• Primerless adhesion to many substrates
• Non-corrosive properties
• Low volatility rate – suitable for high vacuum environments
• Excellent electrical insulation properties

HT-6120 has a paste-like consistency and can be applied by spatula, brush, automated dispenser or printing for flexible and easy application.

Typical applications of HT-6120:

• Bonding and sealing high temperature sensors
• Adhering ceramic, glass and metal components
• Sealing oven doors, lids, plates and ventilation systems
• Electrical insulation and moisture sealing

HT-6120 Technical Properties

Property	Value
Base Polymer	Silicone
Color	Red
Cure System	Moisture Cure
Cure Time at 25C	24 hours
Rheology	Paste
Viscosity	500,000 cP
Operating Temp Range	-62 to 300°C
Dielectric Strength	550 volts/mil
Dielectric Constant	2.8

Using BISCO HT-6000 Series Silicones

BISCO HT-6000 series silicones are engineered for demanding high temperature applications, but proper preparation, mixing, application and curing procedures must be followed to achieve optimal results.

Here are some tips for working with these specialty silicone products:

• Surfaces must be clean, dry and free of oils, grease and dirt. Clean with a solvent-dampened cloth.
• For optimum bond strength, surfaces may require priming or mechanical abrasion.
• Mix two-part silicones thoroughly and use within the prescribed working time.
• Apply silicone using a spatula or trowel for larger seals and bonds, or dispense from cartridges for smaller applications.
• Allow silicone to fully cure as specified before putting assembly into service.
• Read product technical datasheets carefully and follow all listed usage instructions.
• Contact BISCO technical services with any questions on appropriate product selection, surface preparation, applications or curing.

Proper usage will result in resilient, high strength seals, barriers and electrical insulation that can perform reliably in the most extreme environments. HT-6000 silicones withstand decades of thermal cycling without cracking, decomposing or losing bond strength.

Frequently Asked Questions

Q: Are BISCO HT-6000 silicones approved for aerospace applications?

A: Many products in the HT-6000 series meet aerospace specifications and are approved for aircraft and component bonding and sealing. Check individual product datasheets for specific certifications.

Q: Can I use HT-6000 silicones for food contact applications?

A: No, HT-6000 silicones are industrial grade products not intended or approved for food contact. BISCO offers food grade silicone sealants under its HT-8000 series for use in food processing equipment.

Q: What is the shelf life of HT-6000 series silicones?

A: Most HT-6000 products have a shelf life of 12 months when stored unopened in the original packaging at temperatures under 30°C (86°F). Always verify date markings on packaging.

Q: Do these silicones require a primer for bonding to metals?

A: Some products offer primerless adhesion to clean, dry metals. Others will require a primer for optimal bond strength. Check individual technical datasheets for primer requirements.

Q: Can I apply a coating over a cured silicone?

A: In most cases coatings will not adhere well to cured silicone. If a coating is needed, a sample patch should be evaluated for compatibility and adhesion performance.