EPO-TEK® 305 Spectrally Transparent Flexible Epoxy, Room Temperature Cure (8oz)

The EPO-TEK^® 305 Spectrally Transparent Epoxy is a two-component, semi-rigid optical-grade epoxy designed for semiconductor packaging, fiber optics, and optoelectronic devices. It is electrically and thermally insulating and cures at 65°C (149°F) for 1 hour. Available in an 8-oz kit.

Features:

• Transmits light in the UV range
• Semi-flexible/semi-rigid with Tg and Shore D values suitable for low-stress optical applications
• Low-viscosity, water-like consistency for pouring, dip coating, brushing, or micro-dispensing
• Versatile curing: 23°C–80°C(73.4–176°F), compatible with many low-cost plastics
• Pot life: 1 Hour

Applications:

• Optics:
  • Index-matching adhesive or coating for scientific and OEM instruments
  • LED potting and encapsulation
  • LCD glass-glass or glass-PET laminations
• Fiber Optics: Potting or sealing fibers in opto-packages to relieve stress
• PCB / General Electronics: Low-stress potting or COB glob top encapsulant as a clear coating

Physical Properties:

• Consistency: Pourable liquid
• Viscosity (23°C): ≤ 250 cPs
• Glass Transition Temperature, Tg: ≥ 35°C (degree Celsius); ≥ 95°F (degree Fahrenheit)
• Shore D Hardness: 66
• Coefficient of Thermal Expansion (CTE):
  • Below Tg: 31 x 10^-6 in/in°C
  • Above Tg: 148 x 10^-6 in/in°C
• Suggested Operating Temperature: < 200 °C (Intermittent); < 392°F

Optical Properties @ 23°C (73.4°F):

• Spectral Transmission:
  • > 67% @ 260 nm
  • > 95% @ 340 nm
  • > 98% @ 400 - 1600 nm
• Refractive Index: 1.4763 @589 nm

See Datasheet for additional properties and application notes