LOCTITE EA 3335 UV Curing Epoxy Adhesive is a one-component, clear epoxy designed for rapid bonding, coating, and tacking of glass, metal, and plastic components. It cures when exposed to suitable ultraviolet light, creating a hard, translucent material with low shrinkage and dependable resistance to heat, water, and chemicals. Its ready-to-use format removes the need for weighing or mixing, making it an efficient choice for precision electronics, optical assemblies, sensors, industrial components, and other production lines that require clean application and controlled curing.

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LOCTITE EA 3335 UV Curing Epoxy Adhesive for Precision Assembly

Unlike two-part epoxies that begin reacting immediately after mixing, this adhesive remains workable until it receives the required UV exposure. Operators can dispense the material, align the components, inspect the bond line, and initiate curing only after the parts are correctly positioned. This on-demand process can reduce assembly errors, shorten fixture time, and support repeatable manual or automated manufacturing.

The uncured adhesive has a typical Brook until it receives the required UV exposure.field viscosity of 5,000 to 7,000 mPa·s at 25°C. This medium-viscosity consistency supports accurate bead placement while providing enough flow to wet prepared bonding surfaces and fill small gaps. The clear liquid is especially useful in applications where the adhesive must pass through transparent glass or plastic before reaching the bond line.

LOCTITE EA 3335 UV Curing Epoxy Adhesive Performance Benefits

LOCTITE EA 3335 UV Curing Epoxy Adhesive cures through a cationic UV mechanism and is designed for exposure at 365 nm. Henkel states that full surface cure also requires irradiation in the 220 to 260 nm range, so lamp spectrum is as important as measured intensity. Under specified laboratory conditions, tack-free surfaces can be achieved in less than 10 to 30 seconds, depending on the UV system and irradiance.

After curing, the epoxy develops a hard protective structure with Shore D hardness of at least 80, a glass transition temperature of approximately 135°C, and low volume shrinkage of about 2.18%. These properties help bonded components retain dimensional stability during temperature changes and support reliable use in precision assemblies. The product also provides high electrical resistivity and dielectric strength, making it valuable for selected electronic insulation, coating, and component-protection applications.

Typical uses include glass-to-metal bonding, glass-to-aluminum joining, plastic assembly, component tacking, electronic coating, optical positioning, sensor construction, and small industrial parts. It is also suitable for applications where low outgassing is required. Because crystalline and semi-crystalline thermoplastics can be vulnerable to stress cracking, users should evaluate the liquid adhesive on the actual production material before approval.

How to Use LOCTITE EA 3335 UV Curing Epoxy Adhesive

For dependable results, clean the bonding surfaces and remove grease, oil, dust, moisture, release agents, and loose contamination. Dispense the adhesive through UV-resistant equipment and black feed lines to limit premature exposure. Apply a controlled quantity to one surface, assemble the components, and confirm alignment before starting the cure cycle.

Select a UV source with suitable wavelength distribution, intensity, and access to the entire bond area. Cure speed and depth depend on lamp type, exposure time, distance from the light source, adhesive thickness, bond gap, and the light transmission of the substrate. Production teams should validate these variables using the actual equipment and component geometry rather than relying only on nominal lamp settings.

Remove excess uncured material before full cure when necessary, and allow bonded parts to cool before applying service loads. Store unopened containers in a dry area, ideally between 8°C and 21°C, and protect the product from daylight, UV radiation, and strong artificial lighting during handling.

LOCTITE EA 3335 UV Curing Epoxy Adhesive is a strong purchasing option for manufacturers seeking rapid light curing, low shrinkage, clear appearance, electrical insulation, and reliable bonding across glass, metal, and plastic assemblies. Its combination of one-part convenience and controlled UV processing supports cleaner, faster, and mor:contentReference[oaicite:1]{index=1} production.

UV curing epoxy adhesives

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