EPO-TEK® 377H
Technical Data Sheet
For Reference Only
Graphite-filled, High 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
VITwo1:1
Part A: 1.29
Part B: 1.33
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® 377H is a two component, high Tg, graphite filled epoxy designed for ESD/EMI shielding ofsemiconductor devices and electronics. It can be used in many electronic industries like consumer, military, medical, and optical/OEM/fiber optics. It is an electrically conductive version of EPO-TEK® 377.
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:* Particle Size:

Part A: Black
Pourable liquid
500 - 1,000
N/A
≥ 95

Part B: Black56
20080> 2,000≥ 10345x 10-6 in/in°C
x 10-6 in/in°C

0.09
0.66
0.78
< 275
416,850≤ 40%%%°C (Intermittent)
psimicrons

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

0.44
≥ 400
N/A
N/A

< 0.1% @ 400-1500
N/A

cPs°C (Dynamic Cure: 20-200°C/ISO 25 Min; Ramp -10-200°C @20°C/Min)

psi
Kg
°C

3,556 psi

W/mK
Ohm-cmnm

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® 377H
Technical Data Sheet
For Reference Only
Graphite-filled, High Temperature Epoxy

EPO-TEK® 377H Advantages & Suggested Application Notes:● Low viscosity - ideal for commercial and micro-dispensing applications.
● Suggested Applications:o Opto-electronics: Adhering IR filter windows to cap of TO-can; opaque epoxy resinin IR and VIS range; near hermetic sealing of windows and packages.
o Hybrid Microelectronics: adhesion to kovar, stainless steel, ceramics, glasses, lidsor substrates in Rf/Microwave devices.
● Convenient 1:1 mix ratio allows for static mixing, or specialty packaging in double-barrel
syringes

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