EPO-TEK® 301-2 Optically Transparent Epoxy, Heat Cure (2.5g)

The EPO-TEK^® 301-2 Epoxy is a two-component, fiber optic epoxy featuring very low viscosity and excellent optical-mechanical properties. It is designed for optical applications such as lenses for optoelectronic display devices, bonding fiber optics (glass or plastic), and optical filters. EPO-TEK 301-2 can be used for bonding glass, quartz, metals, and most plastics. Recommended Cure: 80°C for 3 hours.

Features of 301-2:

• Pot Life: 8 Hours
• Can resist yellowing over 17 days of continuous UV light exposure
• Resistant to impact and vibration
• Low-stress adhesive
• Passes NASA low outgassing standard ASTM E595 with proper cure

Applications:

• Semiconductor:
  • Underfill for flip chips, glob-top encapsulation over wire bonds
  • Spin coating at wafer level, including wafer-level packaging
• Fiber Optic Adhesive:
  • Fiber bundling and ferrule termination
  • Mounting optics inside fiber components
  • Bonding glass coverslips over V-grooves
  • Supports visible and IR spectral transmission
• Easy to use for potting, casting, encapsulation, and adhesive applications
• Excellent adhesion to glass, quartz, metals, wood, and most plastics
• Can be used for impregnating wooden or porous objects for artifact restoration

Physical Properties:

• Color (before cure)
  • Part A: Clear/Colorless
  • Part B: Clear/Colorless
• Consistency: Pourable liquid
• Viscosity (23°C) @ 100rpm: 225 - 425 cPs
• Glass Transition Temperature, Tg: ≥ 80°C
• Shore D Hardness: 80
• Coefficient of Thermal Expansion (CTE):
  • Below Tg: 61 x 10^-6 in/in°C
  • Above Tg: 180 x 10^-6 in/in°C
• Suggested Operating Temperature: < 300°C (Intermittent); < 572°F 

Electrical and Thermal Properties:

• Volume Resistivity @ 23°C: ≥ 2 x 10¹² Ohm-cm
• Dielectric Constant (1KHz): 3.80
• Dissipation Factor (1KHz): 0.012

Optical Properties @ 23°C:

• Spectral Transmission:
  • ≥ 94% @ 320 nm
  • ≥ 99% @ 400-1,200 nm
  • ≥ 98% @ 1,200-1,600 nm
• Refractive Index: 1.5318 @ 589 nm

See Datasheet for additional properties and application notes