EPO-TEK® 320
Technical Data Sheet
For Reference Only
Optical, Opaque Epoxy

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

Recommended Cure: 65°C / 2 Hours

April 2018
IVTwo
10 : 2
Part A: 1.10
Part B: 0.87
1 Hour
One year at room temperature

Minimum Alternative Cure(s):May not achieve performance properties listed below
23°C / 24 HoursNOTES:● 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 orpost-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.
● TOTAL MASS SHOULD NOT EXCEED 25 GRAMS

Product Description: EPO-TEK® 320 is a two component, black-colored and optically opaque epoxy designed for optical, medical,
and opto-electronic packaging of semiconductor devices and components. It is a widely used fiber-optic grade epoxy.
Typical Properties: Cure condition: Varies as required
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 Part B: Clear/Colorless
Slightly thixotropic paste
700 - 1,200 cPs
5.7≥ 55 °C (Dynamic Cure: 20-200°C/ISO 25 Min; Ramp -10-200°C @20°C/Min)
58169
83> 2,000≥ 15384x 10-6 in/in°C
x 10-6 in/in°C

0.27
0.45
0.80
< 300506,751≤ 20%%%°C (Intermittent)
psimicrons

psiKg°C

5,334 psi

ELECTRICAL AND THERMAL PROPERTIES:
Thermal Conductivity:
N/A
Volume Resistivity @ 23°C:≥ 1 x 106
Dielectric Constant (1KHz):
N/A
Dissipation Factor (1KHz):
N/A

Ohm-cmOPTICAL PROPERTIES @ 23°C:
Spectral Transmission:
Refractive Index:

nm< 1 % @ 300-2500
N/A

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® 320
Technical Data Sheet
For Reference Only
Optical, Opaque Epoxy

EPO-TEK® 320 Advantages & Suggested Application Notes:● Optically opaque between IR and VISIBLE regions of light, including 185 – 2500 nm range● It can be used for room temperature curing, low temp, or box oven elevated temperature
cure.
● Many modifications are available, such as viscosity, electrical insulation, Tg, andflexibility. Contact techserv@epotek.com for your best recommendation.
● Suggested Applications:o Optical:
 blocking light in photonics packaging through VIS and NIR range; sensor
packaging including IR detectors packaged in TO-cans
 bonding of various optics including lens, prism, diodes
 adhesion to metals, most plastics, and glasseso Fiber optics: sealing / potting fibers into the boot, ferrule, or fiber feed-through ofthe package wall
● The low viscosity nature allows syringe dispensing and automation, hand, brushing, roller
coating, tooth-pick or spatula, and pour or dipping

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