LinqSil LSC100 One-Part Liquid Silicone Semiconductor Junction Coating

Main features

One-part liquid silicone coating
For protection and passivation of semiconductor junctions
Ionic purity levels of max 1 ppm

Product Description

LinqSil LSC100 liquid silicone junction coatings, are high purity, 100% solids, siloxane systems designed for semiconductor junction coatings. The LinqSil LSC100 coatings are one-part silicone coatings with a heat cure. Demanding production procedures and rigid quality control requirements guarantee ionic purity levels of maximum 1 ppm.

LinqSil LSC100 junction coatings will prevent electrical breakdown, minimize junction surface leakage and stabilize peak inverse voltage, and provide environmental protection for high temperature performance and thermal cycling. LinqSil LSC100 is designed for passivation coating of transistor, diode and rectifier junctions.

Typical applications of the LinqSil LSC100 liquid silicone coating systems include conformal coatings that are used to provide mechanical and electrical insulation prior to plastic molding, protective coatings over hybrid integrated circuits to prevent chip damage during potting and other ultra-pure, hermetic-type passivations of semiconductors to create a shell against corrosion.

Specifications

Technical Specifications

General Properties

Appearance

Appearance
Appearance at room temperature.

Clear

Color

Color
The color

Clear

Solids

100 %

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.

1.03

System

One-Part Siloxane

Curing Schedule

Curing Schedule
Curing schedule is the time and temperature required for a mixed material to fully cure. While this applies to materials that cure with heat, there are also other materials that can be cured with UV.

Even though some materials can cure on ambient temperatures, others will require elevated temperature conditions to properly cure.

There are various curing schedules depending on the material type and application. For heat curing, the most common ones are Snap cure, Low temperature cure, Step cure and Staged cure.

Recommended cure type, schedule, time and temperature can always be found on the Technical data sheets.

Cure Type

1 hr @ 135-150 °C

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 @ 4.5°C	3 months

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

7500 mPa.s

Electrical Properties

Dielectric Constant

Dielectric Constant
Dielectric Constant (k), commonly known as relative permittivity, is a number relating the ability of a material to carry alternating current to the ability of vacuum to carry alternating current.

It determines the ability of an insulator to store electrical energy and is the ratio of electric permeability in vacuum against the electric permeability of a material.

The lower the dielectric constant (κ) and dissipation factor, the less energy is absorbed from an electric field, making it a much better insulator.

It is a dimensionless property that can be affected by various factors such as the thickness uniformity of a material, insufficient contact between the sample and electrodes, water adsorption and contact resistance.

Dielectric Constant @ 1000 kHz

3.5

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.

17.7 kV/mm

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.

1.0x10¹⁵ Ohms⋅cm

Dissipation Factor

Dissipation Factor
Dissipation factor is commonly known as loss tangent or tan delta.  

It is a ratio of the loss index and the relative permittivity and it measures the inefficiency of an insulating material to maintain energy (that otherwise dissipates in the form of heat). The lower the factor, the better the insulation.

It is the reciprocal of the quality factor and always refers to a specific temperature and frequency.

Dissipation Factor @ Imc

0.001

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 A)	30

Elongation

Elongation
Elongation is the process of lengthening something.

It is a percentage that measures the initial, unstressed, length compared to the length of the material right before it breaks.

It is commonly referred to as Ultimate Elongation or Tensile Elongation at break.

130 %

Tensile Strength

Tensile Strength
The tensile strength of a material is the maximum amount of tensile stress that it can withstand while being stretched or pulled before failure.

Some materials break very sharply, without plastic deformation, in what is called a brittle failure. Others, which are more ductile, including most metals, experience some plastic deformation and possibly necking before fracture.

Tensile Strength

Tensile Strength
Tensile strength determines the resistance of a material to break under tension and it measures how much elongating load (or tensile stress) it can handle before fracture.

To make it simple, it measures how much force we have to apply when pulling apart a material before it breaks.

2.8 MPa

Other Properties

Impurities
Aluminum (Al) Aluminum (Al) Aluminium is a metallic element with a silvery-white, soft nonmagnetic, ductile elements that has a melting point of 660.3 C	1.0 ppm
Antimony (Sb) Antimony (Sb) Antimony is a lustrous gray metalloid found in batteries, low friction metals, cable sheating and among other products	1.0 ppm
Chromium (Cr) Chromium (Cr) Chemical element with a steely-grey, hard and brittle metal, resists tarnishing and has a high melting point.	1.0 ppm
Copper (Cu)	1.0 ppm
Iron (Fe) Iron (Fe) A chemical element with a melting point of 1,538 C	1.0 ppm
Lead (Pb)	1.0 ppm
Magnesium (Mg)	1.0 ppm
Nickel (Ni)	1.0 ppm
Potassium (K)	1.0 ppm
Sodium (Na)	1.0 ppm