EPO-TEK® 323LP
Technical Data Sheet
For Reference Only
Optical 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
IXTwo
10 : 1
Part A: 1.20
Part B: 1.09
24 Hours
One year at room temperature
Six months at -40°C

Minimum Alternative Cure(s):May not achieve performance properties listed below
90°C / 30 Minutes

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® 323LP is a two component, high temperature epoxy designed for semiconductor, hybrid, fiber, andoptical applications. It is a longer pot life alternative of EPO-TEK® 353ND.
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) @ 50 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 to slight yellow Part B: Yellow
Pourable liquid
3,500 - 5,000 cPs
N/A≥ 100 °C (Dynamic Cure: 20-200°C/ISO 25 Min; Ramp -10-200°C @20°C/Min)
51
185
88
> 2,000≥ 20413x 10-6 in/in°C
x 10-6 in/in°C

0.31
0.460.85< 300444,110
N/A%%%°C (Intermittent)
psi

ELECTRICAL AND THERMAL PROPERTIES:
Thermal Conductivity:
N/A
Volume Resistivity @ 23°C:≥ 3 x 1012
Dielectric Constant (1KHz):
2.62
Dissipation Factor (1KHz):
0.003
OPTICAL PROPERTIES @ 23°C:
Spectral Transmission:
Refractive Index:≥ 94% @ 820-1,620≥ 90% @ 640-800
1.5704 @ 589

psiKg
°C

7,112 psi

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® 323LP
Technical Data Sheet
For Reference Only
Optical Epoxy

EPO-TEK® 323LP Advantages & Suggested Application Notes:● 24 hour pot life to promote mass production usage. It has an amber color change uponcure.
● Semiconductor:○ Wafer to wafer bonding of CSP; fabrication of MEMs devices; flip chip underfill.
● Hybrid:○ Providing near hermetic seals and UHV seals in sensor devices, resisting hightemperature packaging.
○ Down-Hole petrochemical fiber optic sensors, resisting >200°C field conditions.
● Fiber optic adhesive designed to meet Telecordia 1221:○ Sealing fiber into ferrules, transmitting light in the optical pathway from 800-1,550 nm
range.
○ Fiber component packaging; adhesive for active alignment of optics, environmental sealof opto-package, V-groove arrays.
● Electronic Assembly:○ Used as dielectric layer in the fabrication of capacitors; laminating PZT peizoelectrics.
○ Impregnating and insulating copper coil windings in motors and inductor coils. Bonding
ferrite cores and magnets.

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