Thursday, February 28, 2013


What is Dielectric Epoxy Coatings.

A dielectric epoxy coatings acts as an electrical insulator that can be polarized by an applied electric field. When a dielectric epoxy coating is placed in an electric field, electric charges do not flow through the material as they do in a conductor, but only slightly shift from their average equilibrium positions causing dielectric polarization.

In physics, the term dielectric strength has the following meanings:

·        of an insulating material, the maximum electric field strength that it can withstand intrinsically without breaking down, i.e., without experiencing failure of its insulating properties.

·        For a given configuration of dielectric material and electrodes, the minimum electric field that produces breakdown.

·        The maximum electric stress the dielectric material can withstand without breakdown.

Dielectric Constant Values

Dielectric Constant (k) is a number relating the ability of a material to carry alternating current to the ability of vacuum to carry alternating current.  The capacitance created by the presence of the material is directly related to the Dielectric Constant of the material.

Knowing the Dielectric Constant (k) of a material is needed to properly design and apply instruments such as level controls using radar, RF admittance, or capacitance technologies.  

There are also analytical reasons to know the (k) of a epoxy material.

Epoxy Coating with Q1 -  4.2
Epoxy Coating with SS -  2.5-3.5

Dielectric strength of Epoxy Coating.

Dielectric strength can be defined as the maximum voltage required causing a dielectric breakdown through the product. In other words, it is the measure of the insulating strength of a material. It is one of the most important factors in selecting an epoxy for various conformal coating, potting and encapsulation applications in the electrical and electronic industries, where excellent electrical insulation properties are a must.

The ASTM D149 standard method used to measure the dielectric strength of a cured specimen. It should be noted that the dielectric strength of an epoxy depends mainly on the thickness of the specimen and the test temperature. Some differences in dielectric strength can be noticed in filled systems when compared to unfilled systems. Also, dielectric strength varies depending on whether the product cures rigid or flexible. The Epoxy Coating Insulation test shows high Ohms value measure of a product’s insulation by applying a voltage of 500V – 1000V.

We at Automotive Solutions offers high build high solid epoxy coating for flooring & metal coating having superior electrical insulation properties with high dielectric strength which is about 450 volts/mil for a 3mm thick specimen at room temperature. 

1 comment:

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