EPO-TEK® 375 High Temperature Epoxy, Heat Cure (4g)

The EPO-TEK^® 375 Low Viscosity, Fiber Optic Epoxy is a two-component, high-temperature epoxy designed for fiber optic, semiconductor, and hybrid applications. Available in a 4 gram packet.

Recommended Cure: 150°C (302°F) for 1 Hour. 

Features of 375:

• Pot Life: 4 Hours - Allows for low temperature curing to be realized and shows an amber color change upon cure.
• High-temperature epoxy
• Low Viscosity
• Compliant with Telcordia GR-1221

Applications for 375:

• Fiber optic adhesive:
  • Ideal for sealing fiber into ferrules and supporting optical transmission from 800–1550 nm
  • Used for fiber component packaging, active alignment of optics, environmental sealing of opto-packages, and V-groove arrays.
• Semiconductor suggested applications: wafer-wafer bonding of CSP; fabrication of MEMs devices; flip chip underfill.
• Hybrid:
  • Providing near hermetic seals and UHV seals in sensor devices and resisting high-temperature packaging.
  • Down-hole petrochemical fiber optic sensors resisting >200°C (392°F) field conditions.
• Electronics assembly:
  • Used as a dielectric layer in the fabrication of capacitors; laminating PZT ferroelectrics found in ultrasound or ink-jetting devices.
  • Impregnates and insulates copper coil windings; bonds ferrite cores and magnets.
  • Structural-grade epoxy found in hard-disk drive devices; bonding of stainless steel metals, Kapton, and magnets.

Physical Properties:

• Color (before cure)
  • Part A: Clear/Colorless
  • Part B: Amber
• Consistency: Pourable liquid
• Viscosity (23°C) @ 50 rpm: 3,000 - 5,000 cPs
• Glass Transition Temperature, Tg: ≥ 100°C
• Coefficient of Thermal Expansion (CTE):
  • Below Tg: 48 × 10⁻⁶ in/in °C
  • Above Tg: 192 × 10⁻⁶ in/in °C
• Shore D Hardness: 88
• Lap Shear @ 23°C: > 2,000 psi   
• Die Shear @ 23°C: ≥ 10 Kg (3,556 psi)
• Weight Loss:
  • @ 200°C: 0.06 %
  • @ 250°C: 0.16 %
  • @ 300°C: 0.49 % 
• Suggested Operating Temperature: < 300 °C (Intermittent); < 572°F

Electrical and Thermal Properties:

• Volume Resistivity @ 23°C: ≥ 1 x 10¹³ Ohm-cm   
• Dielectric Constant (1KHz): 3.34   
• Dissipation Factor (1KHz): 0.004 

Optical Properties @ 23°C:

• Spectral Transmission:
  • ≥ 94% @ 600-790 nm
  • ≥ 98% @ 800-1500 nm
• Refractive Index: 1.5692 @589 nm

See Datasheet for additional properties and application notes