EPO-TEK® 302-3M Transparent Epoxy, Room Temperature Cure (4g)

The EPO-TEK^® 302-3M Optically Transparent Epoxy is a two-component epoxy used for optical, fiber optic, and semiconductor applications. The epoxy is good for adhesive bonding, sealing, potting, or as a coating. Recommended Cure: 65°C (149°F) for 3 Hours. Available in a 4-gram packet.

Features:

• Low-viscosity, colorless, clear epoxy well-suited for potting and for transmitting VIS or NIR light in opto-circuits
• Excellent resistance to water, chemicals, and solvents such as 10% nitric acid, acetone, hexane, and dichloromethane
• Passes NASA low outgassing standard ASTM E595 with proper cure
• Pot life: 1 Hour

Applications:

• Fiber Optic / Optical:
  • Potting and encapsulation; lens and prism bonding for scientific/OEM instruments; LED encapsulation
  • VIS/NIR transmission from 350–1550 nm; suitable for use directly in the optical pathway
  • Potting or sealing fibers into the snout of opto-packages
  • Adhesive for V-grooves, fiber arrays, or lens arrays
  • Bonding optical fibers into ferrules (glass or plastic fibers; ferrules made of glass, quartz, stainless steel, Kovar, or ceramic)
• Semiconductor:
  • Recommended for underfilling flip chips or SMDs on PCBs
  • Suitable for COB glob-top processes using a DAM/FILL method
  • Resistant to 85/85 moisture soaks, thermal cycles, and thermal shock

Physical Properties:

• Consistency: Pourable liquid
• Viscosity (23°C) @ 100 rpm: 800 - 1,600 cPs
• Glass Transition Temperature, Tg: ≥ 55°C (degree Celsius); ≥ 131°F (degree Fahrenheit)
• Shore D Hardness: 80
• Coefficient of Thermal Expansion (CTE):
  • Below Tg: 56 x 10^-6 in/in°C
  • Above Tg: 193 x 10^-6 in/in°C
• Suggested Operating Temperature: < 250 °C (Intermittent); < 482°F

Optical Properties:

• Spectral Transmission: > 95% @ 460-1620 nm
• Refractive Index (uncured): 1.5446 @ 589 nm

See Datasheet for additional properties and application notes