Electrostatics Testing

Electrical volume resistivity is the electrical resistance measured across opposite faces of a cube of solid material with side length 1m.  Volume resistivity is used to predict, indirectly, the low-frequency dielectric breakdown and dissipation factor properties of some materials.

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Electrical surface resistivity is the electrical resistance of the surface of a material, in units of Ohms per Square (Ω/sq). The surface resistivity is independent of the material size or thickness. It is a calculated based on the surface resistance of the material and the known geometry of the electrodes. It signifies the material’s resistance to current flow when an electrical potential difference is applied to the surface. Surface resistivity differs from volume resistivity as it specifically addresses the electrical characteristics of a material’s surface layer, influencing its electrical behaviour in applications such as coatings, films, and insulating layers.

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The charge decay time test is a method used to assess the ability of materials to dissipate or eliminate electric charges over time. This test measures the rate at which the charge dissipates from a material’s surface after it has been charged, often due to static electricity or electrostatic discharge (ESD). The rate of charge dissipation or relaxation is an essential characteristic for materials used in applications where the buildup and dissipation of static charges can impact performance, safety, or product quality.

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Breakdown voltage is the minimum voltage that causes a portion of an insulator to experience electrical breakdown and become electrically conductive. All dielectric materials have a maximum applied field at which they fail and begin to conduct charge, called the dielectric breakdown strength (or alternatively dielectric breakdown voltage). The breakdown occurs either by movement of charge carriers within the dielectric material, result of dielectric and/or Joule heating or compression by electrostatic forces. This breakdown is often accompanied by a sudden and substantial increase in conductivity, resulting in the formation of an electric arc or breakdown path through the insulator.

Electrostatic charge transfer refers to the movement or exchange of electric charge between materials or objects through contact or proximity, resulting in the redistribution of charges and potential differences between the surfaces involved. This phenomenon occurs due to the movement of electrons from one surface to another, leading to an imbalance of positive and negative charges. This test is designed to measure the charge transferred in electrostatic discharges from insulating surfaces. The test is best applied to brush discharges from material/ equipment surfaces and provides an alternative to determining discharge energy by ignition of local flammable gas mixtures.

Electrostatic charge transfer refers to the movement or exchange of electric charge between materials or objects through contact or proximity, resulting in the redistribution of charges and potential differences between the surfaces involved. This phenomenon occurs due to the movement of electrons from one surface to another, leading to an imbalance of positive and negative charges. This test is designed to measure the charge transferred in electrostatic discharges from insulating surfaces. The test is best applied to brush discharges from material/ equipment surfaces and provides an alternative to determining discharge energy by ignition of local flammable gas mixtures.

Electrostatic charge transfer refers to the movement or exchange of electric charge between materials or objects through contact or proximity, resulting in the redistribution of charges and potential differences between the surfaces involved. This phenomenon occurs due to the movement of electrons from one surface to another, leading to an imbalance of positive and negative charges.

Flexible intermediate bulk containers (FIBC) are used in industry for storage and transport of powders and granules. They are commonly constructed from polypropylene fabric or similar strong and heavy-duty insulating materials. During the filling and emptying of the FIBC’s, electrostatic charges can be built up which accumulate on the product of the container. In the event of the release of the charge in the form of incendiary discharge, an ignition can occur in a flammable atmosphere.

Flexible intermediate bulk containers (FIBC) are used in industry for storage and transport of powders and granules. They are commonly constructed from polypropylene fabric or similar strong and heavy-duty insulating materials. During the filling and emptying of the FIBC’s, electrostatic charges can be built up which accumulate on the product of the container. In the event of the release of the charge in the form of incendiary discharge, an ignition can occur in a flammable atmosphere.

Liquid conductivity is the electrical resistance of uncharged fuel in the absence of ionic depletion or polarization. It is the electrical conductivity at the initial instant of current measurement after a DC voltage is impressed between electrodes. The test is designed to determine the rest electrical conductivity of liquids in the range 0.1 to 2,000 pico Siemens per meter (pS/m).