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Results for: Kapton

Common Questions About Kapton® Wire

Love it or hate it, the fact is that Kapton® insulated wires will be on aircraft for at least another couple of decades, and because of this, we should learn to live with the insulation type. Part of living with it is understanding it. If you have questions that you would like to see answered, please send them to Lectromec or add them to the comments section below. We plan to add to this article as the questions arise. Read more

S&T 2022 Meeting Report

As in any scientific industry, aerospace across the globe benefits from the sharing of information and research. The annual S&T Electrical Systems and Wiring Inter-Agency Meeting is held each December with exactly this goal. The following are some highlights from the presentations and discussions from the 2022 meeting. Read more

Low Temperature Bend Testing for Lunar Applications

NASA sought to evaluate wire and cable flexibility for lunar applications; specifically looking to evaluate the ease of reeling/unreeling wire and cable in lunar environments. Bend testing was performed on 35 different insulated wire and cable constructions at liquid nitrogen temperature to evaluate flexibility in extreme cold conditions. It was the intent of this effort that, “testing at the extreme cold temperature of liquid nitrogen will begin to build a database of what off-the-shelf types of wires and eventually cabling may be applicable to the lunar environment.” Read more

WPAFB Wire Study

Key Takeaways Publicly available recorded data compares many of the commonly used aerospace wire types. Corona extinction and inception voltages of cables decrease drastically with an increase of elevation. Many insulation types display a significant decrease in mechanical durability at increased temperatures. Modern wires of the AS22759 family are incapable of stopping 270 voltage DC […] Read more

The Potential 270VDC EWIS Component Failure Impact

The More Electric Aircraft (MEA) design concept has placed, and will continue to place, a greater importance on aircraft electrical power and the supporting Electrical Wiring Interconnection System (EWIS) to accomplish flight critical tasks. To take the greatest advantage of weight savings from using electrically powered components, higher voltages have been brought into the aircraft power architecture.

The goal of Lectromec’s research was to generate data of the potential impact of EWIS component failure. Even with high voltage systems having been fielded for a couple decades, much of the published research provides information on the failure of 115VAC and 28VDC power systems. This research performed by Lectromec sought to fill in that gap.

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Should Polyimide Insulated Wire be Trusted?

The history of polyimide insulated wire is one that has numerous opinions and a lot of misconceptions. After several incidents involving polyimide wire on aircraft in both military and commercial, many within the aerospace industry refused to put any polyimide insulated wire/cable onto the aircraft they design/maintain. As is often the case with components involved in incidents, a lot of facts and myths get jumbled together. Read more

Correcting Bad Wire System Guidance

Consider a common aircraft wire: how many requirements and standards must be considered during its design and fabrication? A simple back-of-the-envelope calculation suggests at least 30 various requirements and standards. For an aircraft wire harness, that number can easily jump to 50. Without a doubt, between each of these standards and requirements, there can be […] Read more

Inherent Viscosity Measurement of Polyimide

Polymers degrade over time. Degradation in internal integrity could lead to mechanical failures and, in operation critical environments, serious accidents. Measuring the inherent viscosity, or the molecular weight of polymers, is a thoroughly proven and effective technique to assess the polymers’ internal integrity. Through an exclusive agreement with DuPont, Lectromec now brings the inherent viscosity […] Read more

Forced Hydrolysis

The forced hydrolysis test places the wire/cable specimen in a high-temperature water bath for an extended duration to evaluate the durability of a wire insulation in high-humidity conditions. Depending on the particular wire specification needs, the test may be required to run for thousands of hours. After the prolonged exposure, the sample is then examined […] Read more

Inherent Viscosity Testing

Inherent Viscosity testing of polyimide (Kapton®) wire insulation supporting Service Life Extension Programs (SLEPs) ×Close Inherent Viscosity testing of polyimide (Kapton®) wire insulation supporting Service Life Extension Programs (SLEPs) Close Polymers degrade over time. Degradation in internal integrity could lead to mechanical failures and, in operation critical environments, serious accidents. Measuring the inherent viscosity, or […] Read more