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Adhesion : the state in which two surfaces are held together by forces or interlocking action of material elements.

 

Adhesives-Sealant : any substance that is capable of bonding other substances together by surface attachment.

 

Attenuation : to reduce the strength-energy loss an electrical impulse to become weaker as expressed by dB (decibel).

 

Buss Bar : an electrical component used to make an electrical connection. This metallic bar used on EMI/RFI windows.

 

Chromate Coating (Iridite) : a surface protection coating used in shielding applications. The coating used is in accordance with Mil-C-5541.

 

Compatibility : the ability of two or more materials to exist in close and permanent association for an indefinite period without degradation.

 

Compression Set : a precision metal stop which limits the compression of gasket material. Stops are used to avoid damaging a gasket due to over torquing.

 

Conductivity : a unit of material with ability to transfer electricity. The electrical current is measured by volume resistivity and expressed in ohms per centimeter.

 

Contact Resistance : the resistance of electrical signals between two materials as expressed in ohms per centimeter.

 

Corrosion : the electrochemical degradation of metals or alloys due to reaction with their environment.

 

DB (decibel) : standard unit of measure for shielding effectiveness and expressed as ration of two valves of electromagnetic field strength where field strength are compared before and after the shield is in place.

 

Deflection : a material change of its configuration as a result of compressive force or stress.

 

Dielectric Strength : the maximum electrical field that a material can withstand without breakdown and measured in kilovolts per centimeter.

 

Durometer : an instrument (Duro) used to measured hardness of rubber material.

 

E-Field : a region of space where there is a high impedance or component of electromagnetic wave.

 

Elastomer : a term referred to synthetic thermosetting high polymers having properties similar to those natural rubber. Elastomers known as i.e., silicone rubber, neoprene, nitrite rubber, butyl rubber, polyurethane rubber.

 

Electromagnetic : a force produced by the interplay of electricity and magnetism.

 

EMC (Electromagnetic Compatibility) : capacity of electronic systems to operate harmoniously without interference or degradation from other electromagnetic impulses.

 

EMI (Electromagnetic Interference) : an electrical interference that can affect the operation of electrical or electronic equipment. Compatibility is accomplished with line fillers and equipment shields.

 

EMP (Electromagnetic Pulse) : a brief surge of voltage or current or short burst of electromagnetic waves as caused by lightning or nuclear explosion.

 

Enclosure : a mechanical, electrical or electronic fixture, housing apparatus.

 

Environment Seal : a gasket used for sealing, patting or mounting to prevent contamination from air, water, pesticide, chemicals, which may impede performance.

 

Extrusion : a processing operation in which a material is forced through a metal forming die, followed by cooling, heating or chemical hardening. The material may be liquid or viscous polymer.

 

Fluorosilicone : a silicone rubber that has superior chemical resistance with extreme temperature performance, solvent and fuel resistance.

 

Gasket (EMI) : a conductive material that is placed between two mating surfaces to provide continuous low resistance across the mating surfaces of an enclosure.

 

Groove : a cut in the surface with a tool to hollow, channel or to make a depression for molds.

 

H-Field or Magnetic : a region of space which there is a low impedance or magnetic components of elctromagnetic source or waves.

 

Hz (Hertz) : the international unit of frequency, equal to one cycle per second.

 

Honeycomb : a ventilating air flow panel with multiple hexagonal cells used to provide the best EMI/RFI shielding. Honeycomb Cells are made of aluminium, steel and brass.

 

Insertion Loss : the shielding effectiveness of a product before and after the insertion air vent panel, shielded window in a seam, conductive gasket in a joint. It is measured in decibel (dB).

 

Impedance : the total opposition offered by an electric circuit to the flow of an alternating current of a single frequency, measured in ohms.

 

Interference : a signal, emissions, malfunctioning or degradation of electrical equipment performance.

 

Monel : an alloy of predominantly nickel (67%) and copper (30%) with very small percentage of carbon, manganese, iron, sulfur and silicone. Very good corrosion resisting properties, high conductivity.

 

Neoprene : a synthetic rubber elastomer. Resistance to oils, oxygen, ozone, heat, light, oxidation and electric current.

 

Passivation : to form a protective coating on the surface of metal to reduce its chemical activity and electricals as exposed in the environment.

 

Permeability : a material that emits a gas or vapors.

 

Plane Wave : an electromagnetic wave that exits at a greater distance than from the source of generation of transmission.

 

PSA (Pressure Sensitive Adhesive) : an adhesive that remains tacky under normal temperatures and humidity when applied to elastomer materials. A protective liner is used for handling, storage and shipping. Easily removed for alignment during equipment assembly.

 

RF (Radio Frequency) : an electromagnetic wave at frequency of above 10 KHz.

 

RFI (Radio Frequency Interference) : a range of frequencies of electromagnetic waves from 10 KHz to GHz that is more restricted to radio frequencies.

 

Shield Effectiveness : the relative measurement of materials effectiveness and properties under a certain criterion as determined by attenuation in electromagnetic field by insertion of a shield between the source and reference point. Express by dB (decibel).

 

Shielding gasket : Electromagnetic compatibility gasket (EMC).

 

Shore A : a measurement of hardness. Durometer measures the degree of hardness in materials like rubber or plastics. Shore A hardness of soft is 20, hard is 90.

 

Silicone : a group of polymerized organic silicone compounds containing a basic structure of oxygen and silicone atoms, high resistance to temperature, water, oils, etc …

 

Silicone Rubber : a rubber polymer made from certain silicones, maintains elsticity and electrical properties over a wide range of temperatures and is used in gasket insulation, tapes, etc …

 

Surface resistivity : the area of contact between two different-opposite surfaces of a square unit. The measurement is expressed in ohms per square.

 

Thermal Conductivity : having to do with the direct relations between heat and electricity as measured in degrees Kelvin, w/mk (watts per meter Kelvin).

 

Viscosity : the internal resistance of a material to flow as exhibited by a fluid.

 

Volume Resistivity : the electrical resistance between opposite surfaces of a unit cube substance and expressed as one-centimer cube (ohm-cm).

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