OPTOLINQ LE-EP123 | One-Part Epoxy encapsulant

Main features

Excellent thermal stability
Excellent UV stability
High light transmittance

Product Description

OPTOLINQ LE-EP123 is a high-performance, single-component epoxy resin that delivers exceptional optical clarity, robust bonding, and thermal stability. It's ideal for demanding applications where light transmission and structural integrity are critical.

OPTOLINQ LE-EP123 offers a wide curing temperature range, excellent anti-sagging properties, and superior high-temperature resistance, making it perfect for prepreg and impregnation processes. LE-EP123 is available with light diffusant depending on customer requirement.

Cure schedule

150°C for 1 hour
160°C for 1 hour and 150 for 30 minutes
80°C for 30 mins and 130°C for 30 mins then 150°C for 30 mins

Specifications
Additional Information

Technical Specifications

General Properties

Appearance

Appearance
Appearance at room temperature.

Colorless

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.

1.52

Specific Gravity

Specific Gravity
Specific gravity (SG) is the ratio of the density of a substance to the density of a reference substance; equivalently, it is the ratio of the mass of a substance to the mass of a reference substance for the same given volume.

For liquids, the reference substance is almost always water (1), while for gases, it is air (1.18) at room temperature. Specific gravity is unitless.

1.00

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

15000 mPa.s

Mechanical Properties

Hardness Hardness Hardness is a dimensionless quantity. There is no direct relationship between measurements in one scale and their equivalent in another scale or another hardness test.
Durometer (Shore D)	85

Electrical Properties

Visible Light Transmission

>90 %

Thermal Properties

Coefficient of Thermal Expansion (CTE) Coefficient of Thermal Expansion (CTE) CTE (Coefficient of thermal expansion) is a material property that is indicative of the extent to which a material expands with a change in temperature. This can be a change in length, area or volume, depending on the material. Knowing the CTE of the layers is helpful in analyzing stresses that might occur when a system consists of an adhesive plus some other solid component.
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.	62 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.	190 ppm/°C

Gel Time Gel Time Gel time is the time it takes for a material to reach such a high viscosity (gel like) that it is no longer workable. It is usually measured for different temperature conditions and even though it does not refer to full cure it is advisable to never move or manipulate the material after it reached its gel time since it can lose its desired end properties.
Gel time @ 150°C	675 Sec

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.

115 °C

Additional Information

Precautions for Use

This product needs to be stored at low temperatures and at dry places. The shelf life will vary depending on the storage conditions.
Before use, allow the material to reach room temperature (15–25 °C, 25–55% RH) for at least 2 to 4 hours, ensuring the packaging is unopened to prevent moisture contamination—thawing time of approximately 2 hours for small packaging (30g). for larger quantities, it may take around 4 hours.
Preheat the material at 40-60°C for about 30-60 minutes
Maintain a clean and ventilated workplace with proper ventilation and exhaust system..
Wear appropriate safety equipment before use and avoid direct contact with the body. Please read the Safety Data Sheet (SDS) carefully before using.

Storage and Handling

Store in a cold, dry, and clean environment, ideally at –10 °C or lower 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 material has a shelf life of 3 months.