LOCTITE SI 5084 UV Silicone Sealant for Glass-to-Metal Gasketing, Electronic Enclosures and Severe Environments

LOCTITE SI 5084 UV Silicone Sealant Benefits

LOCTITE SI 5084 UV Silicone Sealant enables high-speed production without resin-to-hardener measurement or manual mixing. Exposed adhesive can become dry to the touch within seconds under sufficient UV irradiance, allowing assembled components to move through handling and inspection stages quickly. Functional strength develops almost immediately after UV exposure, while the material continues building its complete performance properties over approximately 72 hours under ambient conditions.

The cured silicone remains flexible and helps absorb shock, vibration and stress generated by differences in thermal expansion. This flexibility improves load distribution across glass, steel, aluminum and other compatible surfaces. The material also resists weathering, moisture and ozone, supporting assemblies that must maintain sealing performance in severe outdoor or industrial environments.

Its thixotropic paste consistency reduces migration after dispensing. Operators can apply controlled beads around enclosure edges, glass panels and gasket channels without excessive flow. The one-part format also supports manual cartridges, automated dispensers and production processes requiring repeatable application.

Applications for LOCTITE SI 5084 UV Silicone Sealant

This product is designed for gasketing and sealing applications where fast UV curing and flexible environmental protection are required. Potential uses include sealing glass windows to metal frames, bonding transparent covers, gasketing communication equipment, protecting electronic housings and sealing industrial enclosures exposed to moisture or weathering.

LOCTITE SI 5084 UV Silicone Sealant can also be evaluated for glass-to-glass, aluminum-to-glass and steel-to-glass assemblies. The secondary moisture-curing mechanism is useful around edges, corners and partially hidden regions where direct UV exposure may be limited. However, deep shadowed sections cure more slowly than illuminated areas and require sufficient access to atmospheric moisture.

Substrate coatings, glass treatments, metal finishes and environmental conditions can affect adhesion. Manufacturers should therefore validate the actual materials, UV equipment, joint geometry and service exposure before approving production use.

LOCTITE SI 5084 UV Silicone Sealant Technical Properties

The uncured product is a translucent straw-colored alkoxy silicone paste with a typical specific gravity of approximately 1.11 at 25°C. Its thixotropic formulation has zero flow under the referenced ISO test, helping the dispensed bead maintain its intended shape.

Henkel recommends an initial UV cure using irradiance of at least approximately 70 mW/cm² for about 20 seconds, although deeper sections may require longer exposure. Under higher UV irradiance, published skin-over and tack-free times can be only a few seconds. Shadowed material relies on moisture curing, with depths of approximately 6 mm requiring at least 24 hours to develop.

Representative cured properties include Shore A hardness of approximately 32 to 47, tensile strength of at least 3.4 N/mm² and elongation of at least 250%. Published lap-shear values include approximately 1.2 N/mm² for aluminum-to-glass, 1.5 N/mm² for steel-to-glass and 1.4 N/mm² for glass-to-glass assemblies.

How to Apply LOCTITE SI 5084 UV Silicone Sealant

Clean all bonding surfaces and remove grease, oil, dust, moisture and loose contamination. Dispense a continuous, uniform bead onto the prepared substrate and mate the components within a few minutes because moisture curing begins immediately after exposure to air.

Expose the assembled joint to a validated UV light source with the required intensity, wavelength, distance and duration. Confirm that all critical exposed areas receive adequate light. Allow shadowed regions and deeper sections sufficient time to complete their secondary moisture cure. Uncured excess may be removed with a compatible non-polar solvent.

Why Choose LOCTITE SI 5084 UV Silicone Sealant?

LOCTITE SI 5084 UV Silicone Sealant combines rapid UV curing, secondary shadow curing, non-corrosive chemistry, flexible mechanical performance and resistance to moisture, ozone and weathering. It is a practical solution for manufacturers requiring fast gasketing and sealing of glass, metal, electronic enclosures and environmentally exposed industrial assemblies.

Review the official Henkel LOCTITE SI 5084 Technical Data Sheet and current Safety Data Sheet before qualification or production use. Explore our UV-curing silicone sealants for additional fast-curing gasketing and enclosure-sealing solutions.