EPO-TEK® 377
Technical Data Sheet
For Reference OnlyHigh Temperature Epoxy

Date:
Rev:
No. of Components:
Mix Ratio by Weight:
Specific Gravity:
Pot Life:
Shelf Life- Bulk:
Shelf Life- Syringe:

Recommended Cure: 150°C / 1 Hour

July 2019
IX
Two1:1
Part A: 1.15
Part B: 1.22
24 Hours
One year at room temperature
Six months at -40°C

NOTES:● Container(s) should be kept closed when not in use.
● Filled systems should be stirred thoroughly before mixing and prior to use.
● Performance properties (rheology, conductivity, others) of the product may vary from those stated on the data sheet when bi-pak/syringe packaging or
post-processing of any kind is performed. Epoxy’s warranties shall not apply to any products that have been reprocessed or repackaged from Epoxy’s
delivered status/container into any other containers of any kind, including but not limited to syringes, bi-paks, cartridges, pouches, tubes, capsules, films
or other packages.

Product Description: EPO-TEK® 377 is a two component, high Tg, fiber optic grade epoxy. It is well suited for semiconductor,
medical and optical applications.
Typical Properties: Cure condition: 150°C / 1 Hour
Different batches, conditions & applications yield differing results.
Data below is not guaranteed. To be used as a guide only, not as a specification. * denotes test on lot acceptance basis
PHYSICAL PROPERTIES:* Color (before cure):* Consistency:* Viscosity (23°C) @ 100 rpm:
Thixotropic Index:* Glass Transition Temp:
Coefficient of Thermal Expansion (CTE):
Below Tg:
Above Tg:
Shore D Hardness:
Lap Shear @ 23°C:
Die Shear @ 23°C:
Degradation Temp:
Weight Loss:@ 200°C:@ 250°C:@ 300°C:
Suggested Operating Temperature:
Storage Modulus:
Ion Content:

Part A: Clear/Colorless
Part B: Amber
Pourable liquid
150 - 300 cPs
N/A≥ 95 °C (Dynamic Cure: 20-200°C/ISO 25 Min; Ramp -10-200°C @20°C/Min)
57
210
671,456≥ 10375

Particle Size:

0.06
0.17
0.50
< 300373,622
26 ppm22 ppmN/A

ELECTRICAL AND THERMAL PROPERTIES:
Thermal Conductivity:
Volume Resistivity @ 23°C:
Dielectric Constant (1KHz):
Dissipation Factor (1KHz):

N/A≥ 1 x 1013
3.36
0.005

OPTICAL PROPERTIES @ 23°C:
Spectral Transmission:Refractive Index:

Cl-:
NH4+:

≥ 90% @ 600-1000≥ 98% @ 1000-6800
1.5195 @ 589

x 10-6 in/in°C
x 10-6 in/in°C
psi
Kg
°C

3,556 psi%%%°C (Intermittent)psiNa+:
15 ppmK+:
3 ppm

Ohm-cmnm
nm
nm

Epoxies and Adhesives for Demanding Applications™
This information is based on data and tests believed to be accurate. Epoxy Technology, Inc. makes no warranties (expressed or implied) as toits accuracy and assumes no liability in connection with any use of this product.
EPOXY TECHNOLOGY, INC.
14 FORTUNE DRIVE, BILLERICA, MA 01821 (978) 667-3805, FAX (978) 663-9782
www.epotek.com

EPO-TEK® 377
Technical Data Sheet
For Reference OnlyHigh Temperature Epoxy

EPO-TEK® 377 Advantages & Suggested Application Notes:● Low viscosity epoxy with excellent handling characteristics. It can be used forencapsulating or potting. It may be applied by hand, pouring, spin coating, brushing,dipping, or automated dispensers.
● NASA approved, low outgassing epoxy – http://outgassing.nasa.gov/● Suggested Semiconductor Grade epoxy:o Spin coating at wafer level for MEMS fabrication of pressure sensors andaccelerometers.
o Wafer-to-wafer bonding in CSP.
o Capillary underfill of flip chip packaged die.
● Suggested Optical grade epoxy, opto-electronic packaging:o Transmission in NIR from 700 – 900 nm >95%.
o Glass seal, hermetic seal of glass plates in LCD fabrication.
o Hermetic seal of IR-filter window to aluminum cap of TO-Can in hybrid packaged
IR sensors.
●Suggested Industrial: resist salt water, hydraulic fluids, motor oil, alcohol, 10% nitricacid, 10% sulfuric acid, 10% ammonia solution and most solvents.

Epoxies and Adhesives for Demanding Applications™
This information is based on data and tests believed to be accurate. Epoxy Technology, Inc. makes no warranties (expressed or implied) as toits accuracy and assumes no liability in connection with any use of this product.
EPOXY TECHNOLOGY, INC.
14 FORTUNE DRIVE, BILLERICA, MA 01821 (978) 667-3805, FAX (978) 663-9782
www.epotek.com