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There are some physical and electrical properties to choose advantagous and qualified bus bar insulators/electrical insulators. 

Electrical and Physical Properties Tensile strength is the amount of stress that the insulator will withstand when pressure is applied pulling straight up on the bolt in the insert. 

Cantilever strength is the amount of weight an insulator will support when something is hung on an insulator that is mounted on the wall. Compression strength is the amount of weight an insulator will support in a direct vertical application of pressure. 

Suspension strength is another term for insulating properties. 

Insulation resistance is expressed as the number of seconds that a material resists the formation of a surface-conducting path when subjected to an intermittently occurring arc of high voltage, low current characteristics. 

A standoff insulator's height determines the distance that will separate a source of voltage from ground or other components. Since an electric current will jump across a gap, the greater the voltage, the greater the distance required for safety. Thread size and insert material. Standoff insulators come with threaded metal inserts for mounting onto walls or cabinets. Several different thread sizes are offered for each size insulator, to accommodate a wide variety of applications and attachment bolts. 

The most popular metal for inserts is copper. Steel inserts are generally used for applications requiring a high torque on mounting bolts or for the consideration of price.As steel stay with copper bar, there will be electrochemical corrosion. 

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