Environmental Stress Crack

Environmental stress crack tests a sample ethylene plastic’s susceptibility to cracking as a result of environmental stress and the presence of selected chemicals (soaps, oils, detergents, etc.). Pre-damaged samples are mounted into the test fixture and submerged in a selected reagent (may depend on standard/ application) at a specified temperature. Specimens are inspected for evidence […] Read more

Equivalent Series Resistance (ESR)

A polarized capacitance bridge is used to measure equivalent series resistance of a capacitor. The Pass/ fail criteria are determined by the product specification sheet. Read more

Fluid Absorption

The fluid absorption test evaluates the ability of a cable sleeve to prevent absorption of external fluids. Testing is performed using fluids as identified in the sample’s product specification. A test sample is cut longitudinally to create a flat strip of sleeving. This strip is affixed to a dry piece of cardboard and mounted to […] Read more

Examination – Wired Contacts

As with any aerospace EWIS component, contacts and connectors should be thoroughly inspected for conformity to the product specification and to ensure no defects are present. This examination specifically applies to wired contacts. Samples are visually inspected at 3X magnification to identify defects in the contact(s). A sample will fail the examination if the presence […] Read more

Insulated Coverings

The ASTM B267 standard provides requirements and suggestions in the use of insulated wire coverings such as silk, nylon, cotton, and glass which can be verified at Lectromec. The standard requires that, when present, an outer layer of covering must be wrapped in the direction opposite to the inner covering. This and other physical characteristic […] Read more

PTFE Tape-Wrapped Jacket Delamination

Delamination is a particularly important consideration in any wrapped insulation/ jacket; separation of the tape layers may lead to unraveling of the jacket and/or significant electrical failures. This test is a visual examination of a tape-wrapped PTFE jacket intended to identify any evidence of delamination. See also Delamination/ Lamination Sealing Read more

Jacket Flaws (Spark Test)

The jacket flaws test (spark test, insulation-continuity proof test, or insulation faults test) aims to identify any defects in a wire/ cable’s outer insulation that would allow an amount of leakage current. Testing is performed in an enclosure filled with conductive metal beads/ balls. The beads are electrified and connected to a continuity detection circuit […] Read more

Insulation Stripping

The insulation stripping test evaluates the ability of insulation to be stripped from a wire sample without causing damage to the conductor. This test uses a standard wire stripping tool as identified in AS5768. After removal of the insulation, the conductor is visually examined and any damage is reported. Read more

Insulation Volume Resistivity

The insulation volume resistance test verifies that the amount of leakage current from a wire sample is within the acceptable range for a particular application by determining the resistivity of the insulation sample. The test sample is submerged in a tap water bath within 250mm of each end. A DC voltage is applied between the […] Read more

Tinning Test

The tinning test evaluates the ability of the tin layer over a copper conductor to protect the inner conductor from chemical degradation. Test samples are exposed to the following solutions: Hydrochloric-acid solution Sodium-polysulfide solution After a series of immersion cycles, as identified in the testing standard, each of the samples are visually examined for any […] Read more

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