EPO-TEK® H77T
Technical Data Sheet
For Reference Only
Thermally Conductive Epoxy

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

Recommended Cure: 150°C / 1 Hour

November 2019
VIIITwo
100 : 15
Part A: 2.69
Part B: 1.22
8 Hours
One year at room temperature

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.
● Syringe packaging will impact initial viscosity and effective pot life, potentially beyond stated parameters.

Product Description: EPO-TEK® H77T is a two component, thermally conductive, electrically insulating epoxy designed for lid-sealingof hybrids found in hermetic packaging of micro-electronics. Lids can be ceramic, glass, aluminum or kovar. Package types can beplastic, metal cases, or ceramic.
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) @ 10 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: Grey
Paste
23,000-34,000
3.0
≥ 80

Part B: Amber

34
127
89
1,215
≥5413

x 10-6 in/in°C
x 10-6 in/in°C

ELECTRICAL AND THERMAL PROPERTIES:
Thermal Conductivity:
Volume Resistivity @ 23°C:
Dielectric Constant (1KHz):
Dissipation Factor (1KHz):cPs°C (Dynamic Cure: 20-200°C/ISO 25 Min; Ramp -10-200°C @20°C/Min)

psi
Kg°C

1,778 psi

< 0.050.08
0.22< 360782,724≤ 50%%%°C (Intermittent)psimicrons

1.1≥ 2 x 1013
5.40
0.004

W/mK
Ohm-cmEpoxies 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® H77T
Technical Data Sheet
For Reference Only
Thermally Conductive Epoxy

EPO-TEK® H77T Advantages & Suggested Application Notes:● High temperature epoxy. Coatings on metals have been subjected to temperatures ashigh as 260°C without bond failure; can also resist >300°C processes found in ceramic or
hermetic packaging.
● Rheology yields a thixotropic paste intended for dispensing and printing applications.
● Available in lower viscosity for better flow properties. Contact techserv@epotek.com foryour best match.
● Excellent solvent and chemical resistance - ideal for harsh environments found in aircraft,under-hood automotive, medical, and petrochemical refineries such as down-holeapplications.
● Can provide near hermetic seals in the packaging of MEMs devices, like pressure
sensors or accelerometers, packaged in TO-cans.
● Suggested for ultra-high vacuum applications.
● It can also be used for sealing of optical filter windows found in scientific OEM or sensor
devices.

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