LINQBOND LE-4422 | one 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

Good thermal resistance
Quick and efficient curing
Outstanding electrical properties

Product Description

LINQBOND LE-4422 is a one-part epoxy resin specifically developed for IC packaging. It is used in a wide range of electronic devices, including but not limited electronic watches, calculators, game consoles, and e-readers.

LINQBOND LE-4422 cures quickly and efficiently at high temperatures. Medium height (approximately 2.0 mm) can be achieved after curing. It has outstanding electrical properties, high peel strength, and excellent thermal resistance. It exhibits good adhesion strength to circuit boards, making it ideal for IC applications and providing excellent protection for aluminum wires.

Specifications
Additional Information

Technical Specifications

General Properties

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	10 days
Shelf Life @ 5°C	90 days

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.

1.4–1.5

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

35,000–60,000 mPa.s

Young's modulus

3974 MPa

Chemical Properties

Water Absorption

0.3 %

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)	81±5

Electrical Properties

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.

>1.0 (E15) 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.	43 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.	122 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	60–120 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.

142 °C

Additional Information

What’s the recommended dispensing process to avoid the voids?

LE-4422 should be applied in a controlled and consistent manner. Abrupt pouring should be avoided. It is recommended to use dispensing equipment to control material flow and allow air to escape as the material fills the package.
Recommended dispensing machine: Peristatic Dispensing Pump.
Mold design is also a factor along with the dispense pattern being used and the dispense volume consistency.

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.
When the material is take out from refrigeration, thaw it first prior to use. Keep in an airtight container at room temperature. After thawing for at least 6 to 8 hours, open and then use.
Maintain a clean and ventilated workplace, using extraction trunks when necessary.
Wear appropriate protective equipment and minimize direct contact with the human body. Refer to the Material Safety Data Sheet (SDS) before use.

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 below 25 °C. Keep away from fire and heat sources. It is strictly forbidden to store in outdoor environments. Shelf life can be extended by using cold storage.

What would be the effect on the product's performance after the guaranteed shelf-life? (for Failure Analysis).

Effects of using 1-part epoxy after guaranteed shelf-life: