LE-8011U | UV-Resistant Clear Epoxy Resin

Harmonization Code : 3907.30.00.90 | Polyacetals, other polyethers and epoxide resins, in primary forms; polycarbonates, alkyd resins, polyallyl esters and other polyesters, in primary forms : Epoxide resins : Other

Main features

High thermal stability with a Tg> 160°C
Strong resistance to UV degradation
High light transmittance

Product Description

OPTOLINQ LE-8011U is an epoxy resin specifically designed for optoelectronic device packaging. This resin exhibits superior thermal stability and excellent UV stability, ensuring that devices can withstand high temperatures and ultraviolet light exposure without degradation.

Upon curing, OPTOLINQ LE-8011U forms robust cross-linked networks, providing strong adhesion and maintaining airtight seals. These properties make LE-8011U an ideal high-performance solution for demanding optoelectronic packaging applications. LE-8011U can be dyed depending on the customer's operating wavelength requirement.

Key Features

Designed for Optoelectronic Device Packaging: effectively seals and protects optoelectronic components.
Superior Thermal Stability: LE-8011U can withstand high temperatures without degrading.
Excellent UV Stability: Resistant to damage and degradation from exposure to ultraviolet light.
High Optical Clarity: Delivers exceptional light transmission, critical for optoelectronic device functionality.
Strong Adhesion: Provides excellent bonding strength to diverse substrates, enhancing package reliability.
Enhanced Air Tightness: Offers effective barrier properties, minimizing gas permeation and protecting sensitive components.

Available versions

Specifications
Additional Information

Technical Specifications

General Properties

Mix Ratio

Mix Ratio
The amount of a constituent divided by the total amount of all other constituents in a mixture

100:95

Pot Life

Pot Life
Pot life is the amount of time it takes for the viscosity of a material to double (or quadruple for lower viscosity materials) in room temperature after a material is mixed.

It is closely related to work life but it is not application dependent, less precise and more of a general indication of how fast a system is going to cure.

7 hours

Refractive index

Refractive index
The refractive index determines how much the path of light is bent, or refracted, when entering a material. It is calculated by taking into account the velocity of light in vacuum compared to the velocity of light in the material.

The refractive index calculation can be affected by the wavelength of light and the temperature of the material. Even though it is usually reported on standard wavelengths it is advised to check the TDS for the precise test parameters.

1.51

Thermal Properties

Glass Transition Temperature (Tg)

Glass Transition Temperature (Tg)
The glass transition temperature for organic adhesives is a temperature region where the polymers change from glassy and brittle to soft and rubbery. Increasing the temperature further continues the softening process as the viscosity drops too. Temperatures between the glass transition temperature and below the decomposition point of the adhesive are the best region for bonding.

The glass-transition temperature Tg of a material characterizes the range of temperatures over which this glass transition occurs.

140-160 °C

Coefficient of Thermal Expansion (CTE)
Coefficient of Thermal Expansion (CTE), α1 Coefficient of Thermal Expansion (CTE), α1 CTE α1 (alpha 1) is the slope of the Coefficient of thermal expansion in a temperature range below the Glass transition temperature (Tg). It explains how much a material will expand until it reaches Tg.	65-75 ppm/°C
Coefficient of Thermal Expansion (CTE), α2 Coefficient of Thermal Expansion (CTE), α2 CTE α2 (alpha 2) is the slope of the Coefficient of thermal expansion in a temperature range above the Glass transition temperature (Tg). It explains the extent to which a material will expand after it passes Tg.	170-190 ppm/°C

Gel Time
Gel Time @ 121°C / 250°F	215-275 minutes

Mechanical Properties

Flexural Modulus
Flexural Modulus @ 25°C	3,200 N/mm2

Flexural Strength
Flexural Strength @ 25°C Flexural Strength @ 25°C Flexural strength, also known as modulus of rupture, or bend strength, or transverse rupture strength is a material property, defined as the stress in a material just before it yields in a flexure test. This is the flexural strength tested at Room Temperature, 25°C	96 N/mm2

Hardness
Durometer (Shore D)	81-91

Chemical Properties

Moisture absorption

0.74 %

Curing Conditions

Curing Schedule
Cure Temperature	150 °C
Full Cure Time	4.0x10⁰ hours

Physical Properties

Viscosity

Viscosity
Viscosity is a measurement of a fluid’s resistance to flow.

Viscosity is commonly measured in centiPoise (cP). One cP is defined as
the viscosity of water and all other viscosities are derived from this base. MPa is another common unit with a 1:1 conversion to cP.

A product like honey would have a much higher viscosity -around 10,000 cPs-
compared to water. As a result, honey would flow much slower out of a tipped glass than
water would.

The viscosity of a material can be decreased with an increase in temperature in
order to better suit an application

500-700 mPa.s

Additional Information

To meet higher application requirements, liquid encapsulation is expected to have (1) excellent thermal stability; (2) low transmittance decay. Our resin technology could help meet these challenges. With the resin improved in LE-8011HT, the pot life increased (~7 hours), and viscosity decreased (~400-800 cP). LE-8011U is an optically clear encapsulation with superior anti-blue decay and thermal aging stability.

OPTOLINQ LE-8011HT | Visible Light Blocking

LE-8011HT is developed based on LE-8011U, thus LE-8011HT keeps UV-blocking properties as LE-8011U.

OPTOLINQ LE-8011U | Optically Clear-UV Light Blocking

Optically clear encapsulation with stable UV blocking capabilities.

VisibleLightBlockingEncapsulant_LE8011HT

OPTOLINQLE-8011UOpticallyclearUVblocking

LE-8011U | UV Aging Performance

LE-8011HT has superior anti-blue decay properties as LE-8011U.

LE-8011U | Thermal Aging Performance

Optically clear encapsulation with stable UV blocking capabilities.

OPTOLINQ LE-8011U Premixed Properties

Property	Part A	Part B
Appearance	Clear to Light Yellow	Clear to Light Yellow
Shelf Life (25℃)	12 months	12 months
Specific Gravity	1.06	0.9

OPTOLINQ LE-8011U Additional Properties

Light Transmittance	Value	Unit
at 450 nm at 600 nm at 700 nm at 850 nm at 900 nm at 950 nm	82.96 86.42 87.38 88.28 87.74 85.50	%
Initial Cure Temperature	130	℃
Initial Cure Time	1	h

Processing Instructions

Mix components A and B in a 100:95 weight ratio and stir uniformly. Ensure that the mixture is uniform and free from streaks or unevenness.
Defoam the mixture under vacuum conditions for 5 minutes.
Recommended curing condition: First cure at 130 °C for 1 hour, then post-cure at 150 °C for 4 hours.

The curing conditions provided are recommended guidelines based on typical laboratory results. Actual curing parameters should be defined and validated by the user to ensure compatibility with specific materials, part geometries, and end-use requirements. It is the user’s responsibility to optimize and confirm curing conditions that meet their performance and quality standards.

Storage and Handling

The uncured resin can be cleaned with acetone or a suitable cleaning agent. Water cannot be used as cleaning agent.

Store in a cold, dry, and clean environment between 10–30 °C with relative humidity below 70%. Keep away from exposure to direct sunlight. It is strictly forbidden to store in outdoor environments. At proper storage conditions, unopened Part A and Part B have a shelf life of 12 months.