LE-2441 | One-Part Optically Clear Epoxy Resin

OPTOLINQ™ LE-2441 is a high-performance UV-curable epoxy resin developed for precision optical bonding and encapsulation. Engineered for fast and tack-free curing under 310–365 nm UV light, it offers superior optical clarity, strong adhesion, and robust thermal resistance. Its high refractive index (1.5665), >89% transmittance from 500 to 900 nm, and glass transition temperature of 157 °C make it ideal for LED optics, fiber-optic components, and sensor assemblies. LE-2441 is a solvent-free, single-component formulation with excellent flowability (viscosity: 2,500 ± 500 cP), and no pot life concerns. RoHS compliant and resistant to oxygen inhibition, it ensures stable processing and long-term performance in high-precision applications.

Product Key Features

• Fast UV curing – Cures quickly at 310–365 nm with minimal energy.
• Tack-free surface – Oxygen-insensitive curing avoids surface inhibition.
• High optical clarity – 90% transmittance at 900 nm; ideal for light-guiding applications.
• Optimal refractive index (1.5665), which is ideal for optical components.
• High Tg (157 °C) – Excellent thermal resistance for demanding environments.
• Low CTE (74 ppm/°C) – Ensures dimensional stability in optical assemblies.
• Strong adhesion to Si, Au, die attach materials, and printed circuit board assemblies, and forms airtight seals upon curing.
• Solvent-free, single-component – No mixing required; easy to handle and apply.
• RoHS compliant – Meets EU Directive 2011/65/EU for environmental safety.

Applications

• LED lens encapsulation and UV bonding
• Optical fiber and photonic component assembly
• Sensor and photodiode sealing
• Transparent coatings for display and imaging devices
• Precision bonding in optoelectronic modules