In order for a wire or cable to be classified as a Mil-Spec wire(Military Specification), it must meet the requirements and comply with the standard created by the U.S. Department of Defense. Some of the most common Mil-Spec wires are:
M16878/4(Type E) is a silver-plated copper wire with an extruded medium-wall of PTFE(Teflon ™) insulation, and can be safely used in environments up to 200°C. Along with its high reliability, this wire provides excellent solder iron resistance, exceptional electrical and thermal stability, and is resistant to chemicals, solvents, greases, and oils.
Type E is common in military-grade wire, which also complies with the National Electrical Manufacturers Association (NEMA) HP3 specification. This Mil-Aero wire is insulated with Teflon and has a .01” wall thickness, which allows a 600V rating.
When a higher temperature rating than 200°C is required, PTFE/Teflon insulated nickel-plated conductor is used instead of the silver-plating. This allows for Type E nickel-plate to have a temperature rating of 260°C. The change of conductor also changes the Mil-Spec from M16787/4 to M16878/25.
When applications require bonding to Type E’s PTFE/Teflon™ insulation, Mil-Spec Inc. provides in-house chemical etching that will allow for bonding. Etching M16878/4 Type E wire is often the first step in other in-house value-added services like striping, twisting, cut and strip, and dip tinning.

M16878/5(Type EE) is a silver-plated copper wire with an extruded heavy-wall of PTFE/Teflon™ insulation and can be safely used in environments up to 200°C. Along with its high reliability, this wire provides excellent solder iron resistance, exceptional electrical and thermal stability, and is resistant to chemicals, solvents, greases, and oils.

Type EE is a common military-grade wire, which also complies with the National Electrical Manufacturers Association(NEMA) HP3 specification. This Mil-Aero wire is insulated with Teflon™ and has a .015” wall thickness, which allows for a 1000V rating.

When a higher temperature rating than 200°C is required, Teflon™ insulated nickel-plated conductor is used instead of silver plating. This allows Type EE nickel-plated conductors to have a temperature rating of 260°C. The change of conductor also changes the Mil-Spec from M16878/5 to M16878/27.
When applications require bonding to Type EE’s PTFE/Teflon™ insulation, Mil-Spec Inc. provides in-house chemical etching that will allow for bonding. Etching M16878/5 Type EE wire is often the first step in other in-house value-added services like striping, twisting cut and strip, and dip tinning. 

M16878/6(Type ET) is another Mil-Aero silver-plated wire, which has a thin-wall extruded PTFE/Teflon™ insulation, and can be safely used in environments up to 200°C. Along with its high reliability, this wire provides excellent solder iron resistance, exceptional electrical and thermal stability, and is resistant to chemicals, solvents, grease and oils.

Type ET is a common military-grade wire, which also complies with the National Electrical Manufacturers Association (NEMA) HP3 specification. This thin-wall military-grade wire has a .006” wall thickness of extruded PTFE/Teflon™, which allows for a 250V rating.

When a higher temperature rating than 200°C is required, PTFE/Teflon insulated nickel-plated conductor is used instead of the silver plating. This allows for Type ET nickel-plate to have a temperature rating of 260°C. The change of conductor also changes the Mil-Spec from M16787/6 to M16878/23.

When applications require bonding to Type E’s PTFE/Teflon™ insulation, Mil-Spec Inc. provides in-house chemical etching that will allow for bonding.