CHT QSil 550SB Self-Priming Silicone Potting Material

Description

QSil 550SB is a two-part self-priming silicone potting material for electronic encapsulation work. The 100 percent solids silicone elastomer is used where assemblies need thermal transfer, low modulus protection, and repair access after cure.

QSil 550SB Benefits

• Self-priming design can reduce separate primer steps when the substrate and process are approved.
• Thermally conductive silicone helps move heat away from potted electronic components.
• Low modulus cured material helps reduce stress on parts during thermal cycling and vibration.
• Long pot life supports larger pours and controlled production setup before heat cure.
• Repairable silicone system gives electronics teams a path for service work when designs allow access.

This product is a fit for electronics groups that need a filled silicone potting compound rather than a rigid epoxy. Confirm cure schedule, fixture temperature, component spacing, and adhesion testing before release.

QSil 550SB Applications

• Electronic module potting where heat transfer and vibration protection both matter.
• LED and lighting assemblies that need encapsulation around sensitive components.
• Power supplies, sensors, and control boards in industrial housings.
• Avionics and transportation electronics that see thermal cycling.
• Prototype builds that need a repairable silicone before final design lock.

Surface Preparation and Use

Clean substrates and housings before mixing. Remove oils, dust, release agents, and moisture that can interfere with adhesion or cure.

Mix the A and B components at the specified ratio, avoid trapping air, and use a controlled heat cure only after the assembly is ready. Run a small qualification batch before moving into production.

Technical Details and Documentation

CHT lists QSil 550SB as a self-priming silicone potting material in its thermally conductive encapsulant range. Published material data reports 0.370 W/m-K thermal conductivity, 4000 cP viscosity, Shore A 55 hardness, 120 percent elongation, and heat cure schedules such as 15 minutes at 150 C. Review current CHT information from CHT Group before specifying this material.

Dispensing and Ordering Help

For related silicone potting compounds and encapsulants, browse Chemical Concepts encapsulants and potting compounds. For help with package size, cure schedule, or material changeover, call (800) 220-1966 or email [email protected].