CHT Group Primer #5 – 5 Gallon Pail, Clear

Description

QSil Primer 5 is a clear to pale yellow silicone adhesion primer supplied here in a 5 gallon pail for production priming work. It is a one-component, alcohol-carried solution of reactive silanes used before bonding condensation cure or addition cure silicone elastomers to prepared surfaces.

QSil Primer 5 Benefits

• Designed for condensation cure and addition cure silicone elastomers.
• Transparent film is suited to optical and clear-part applications where appearance matters.
• CHT data notes that it will not haze, crack, or craze polycarbonate or acrylic.
• One-component liquid format avoids ratio mixing at the priming station.
• Five gallon pail size fits production cells that prime repeated parts or larger surfaces.

This primer belongs in a controlled bonding process, not as a fix for dirty or poorly prepared parts. It helps create an adhesion-ready interface when the surface is clean, dry, and matched to the silicone system being applied.

QSil Primer 5 Applications

• Priming acrylic and polycarbonate parts before silicone bonding.
• Clear optical assemblies that need a transparent adhesion aid.
• Electronics and LED assemblies using silicone encapsulants or gels.
• Production dipping, wiping, brushing, or spray priming stations.
• Prototype work qualifying silicone adhesion on non-porous substrates.

Surface Preparation And Use

Clean all surfaces before priming. Remove grease, oil, dust, release agents, and high-boiling solvent residue. CHT guidance calls for dry surfaces, with non-porous substrates solvent degreased before primer application.

Apply a thin film by wiping, brushing, dipping, or spraying, then allow the primer to cure before silicone placement. Published CHT data lists relative humidity above 40 percent and about 30 minutes at room temperature, with modest heat as an option when qualified by the process owner.

Technical Details And Documentation

CHT lists QSil Primer No. 5 as a primer-silicone adhesion aid with 4 percent solids, 0.82 specific gravity, 24 month shelf life, and transparent to pale yellow appearance. Review current information from CHT Group before approving storage, handling, or bonding instructions.

Ordering Help

For related adhesion promoters, primers, accelerators, and silicone bonding supplies, browse Chemical Concepts primers and accelerators. For help matching primer to silicone chemistry and substrate, call (800) 220-1966 or email [email protected].