EPO-TEK® 301
Technical Data Sheet
For Reference Only
Spectrally Transparent Epoxy

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

Recommended Cure: 65°C / 2 Hours

July 2019
XITwo
20 : 5
Part A: 1.15
Part B: 0.87
1-2 Hours
One year at room temperature
Six months at -40°C

Minimum Alternative Cure(s):May not achieve performance properties listed below
65°C / 1 Hour
23°C / 24 Hours● 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.
● TOTAL MASS SHOULD NOT EXCEED 25 GRAMS

Product Description: EPO-TEK® 301 is a two component, room temperature curing epoxy featuring very low viscosity, and excellent
optical-mechanical properties.
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: Clear/Colorless
Part B: Clear/Colorless
Pourable liquid
100 - 200 cPs
N/A≥ 65 °C (Dynamic Cure: 20-200°C/ISO 25 Min; Ramp -10-200°C @20°C/Min)
399885> 2,000≥ 10430

x 10-6 in/in°Cx 10-6 in/in°C

0.12
0.13
0.39
< 300436,249
N/A%%%°C (Intermittent)
psi

ELECTRICAL AND THERMAL PROPERTIES:
Thermal Conductivity:
N/A
Volume Resistivity @ 23°C:≥ 1 x 1013
Dielectric Constant (1KHz):
4.00
Dissipation Factor (1KHz):
0.016
OPTICAL PROPERTIES @ 23°C:
Spectral Transmission:

Refractive Index:≥ 99% @ 382-980≥ 97% @ 980-1,640≥ 95% @ 1,640-2,040
1.519 @ 589

psiKg°C

3,556 psi

Ohm-cmnm
nmnm
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® 301
Technical Data Sheet
For Reference Only
Spectrally Transparent Epoxy

EPO-TEK® 301 Advantages & Suggested Application Notes:● Semiconductor: optical glob top or underfill; adhesion to common wafer passivation,solder mask and flex circuits; compatible with LED die, Si, GaAs.
● PCB: general potting and protection over FR4, flex, or ceramic PCBs.
● Fiber Optic:○ Adhesive for glass and plastic fibers; wicking into fiber bundles used in patch cords,endoscopes or sensor devices; adhesive/seal/encapsulant used for fiber packaging andcomponents; transmission of IR up to 2500 nm; terminating fibers into ferrules; fiber
coupling and splicing.
● Opto-electronic:○ LCD/LED adhesive for laminating glass layers; adhesion to PET plastic; general potting,encapsulation, and protection; spectral transmission in VIS and IR light;
adhesive/encapsulant for VCSEL's packaged devices; resisting yellowing per ASTM
D1925; adhesive for precision optics including lens, prism, beam splitter cubes, mirrors,and diodes, found in medical, university, or research communities.
● NASA approved, low outgassing epoxy - http://outgassing.nasa.gov/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