OPTOLINQ LE-2161 | Two part 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
  • Low viscosity
  • Fast curing
  • High transparency and good electrical properties

Product Description

OPTOLINQ LE-2161 is a transparent, two-part epoxy resin ideal for potting small components and sealing large dot matrix panels. It offers a fast curing rate, moderate curing temperature, and low viscosity post-mixing, and delivers exceptional electrical properties and transparency upon curing. To meet specific color requirements, it can easily be colored and diffused using specialized dye concentrates and diffusant concentrates.

OPTOLINQ LE-2161 serves as an ideal option for various electronic applications, including smart rings, due to its ability to encapsulate delicate electronic components while maintaining transparency and providing robust electrical insulation.

Cure Schedule

  • 24h @ 25°C
  • 4h @ 50–60°C
Product Family
LE-2161  
5kg barrel - Part B 5kg barrel - Part A

Catalog Product

Unlike other products we offer, the products listed on this page cannot currently be ordered directly from the website.
Packaging
TDS, SDS & Technical documents

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
 3:1
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.
 1.67–2 hours
Shelf Life
Shelf Life
Shelf life is the amount of time after manufacturing that a product is guaranteed to retain its properties.

It differs vastly per product and it is based on temperature and storage conditions.

The properties can be guaranteed for the temperature and time range indicated on the TDS since those are the ones tested to be the best for the product.
Shelf Life @ 25°C 183 days
Chemical Properties
Water Absorption 0.3 %
Electrical Properties
Dielectric Strength
Dielectric Strength
Dielectric strength is measured in kV per mm and is calculated by the Breakdown voltage divided by the thickness of the tested material.

Those two properties go hand in hand and while Breakdown voltage is always thickness dependent, dielectric strength is a general material property.

As an example, the dielectric strength of Polyimide is 236 kV/mm. If we place 1mm of Polyimide between two electrodes, it will act as an insulator until the voltage between the electrodes reaches 236 kV. At this point it will start acting as a good conductor, causing sparks, potential punctures and current flow.
 20 kV/mm
Surface Resistivity >1.5×10¹⁵ Ohms/sq
Volume Resistivity
Volume Resistivity
Volume resistivity, also called volume resistance, bulk resistance or bulk resistivity is a thickness dependent measurement of the resistivity of a material perpendicular to the plane of the surface.
 >1.6×10¹⁵ Ohms⋅cm
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.
 80 ppm/°C

Additional Information

Anti-yellowing Performance of LE-2161

The following optical images of cured Optolinq LE-2161 samples (10 and 30 g) demonstrate its anti-yellowing capability under two distinct conditions: exposure to 70 °C for 18 hours and  to 85 °C, 85% RH for 24 hours. The observed cloudiness is due to the presence of an anti-yellowing filler, a critical component for smart ring technology. This filler serves a crucial purpose without compromising the transmittance of the encapsulant, although it's important to note that the material's thickness can influence this aspect.

Anti-yellowing LE-2161

 

Recommended Curing Conditions

Cure at 25 °C for 24 h or at 50–60° C for 4 h.

These guidelines offer recommended curing parameters. Define the exact curing parameters to align with your product specifications.

Precautions for Use

  1. The usable time after A and B are mixed strongly depends on the temperature and mixing volume. Higher temperatures and larger mixing volumes lead to shorter working times. Therefore, the mixing temperature and amount should be determined based on on-site procedures.
  2. Use the product in a clean and well-ventilated workplace.
  3. Wear appropriate safety equipment before use and avoid direct contact with the body. Please read the Material Safety Data Sheet (SDS) carefully before using.

Please note that the provided information is based on available data and typical conditions. For specific applications and detailed test results, refer to the actual test data and conduct appropriate certifications.

Storage and Handling

Store in a ventilated, dry, and clean environment. Keep away from fire and heat sources. It is strictly forbidden to store in outdoor environments. The validity time will vary depending on storage conditions. At proper storage conditions, Part A and Part B have a shelf life of 183 and 93 days, respectively. Shelf life can be extended by using cold storage.