Seal

This test evaluates the quality of a sealing component part. This test may identify defects in the sealing material or due to the manufacturing process used to form the seal. Testing may be performed upon receipt of samples to verify initial quality, or as post-test evaluation to evaluate component performance under other test conditions. There […] Read more

Unbalanced Pair to Ground Capacitance

A capacitance unbalance bridge is used to measure the pair-to-ground capacitance of a wire pair inside of a multi-pair cable. Read more

Tensile Strength and Elongation of Extruded Insulation, Sheath, and Jacket Materials

This method is intended for use in determining the tensile stress of insulation and sheath compounds. It is applicable to the usual grades of rubber and thermoplastic compounds used for insulation and sheaths. The specimen shall be a piece of the insulation or sheath taken from the inspection unit. The die used to make the […] Read more

Twisting Endurance

This test is performed on cables which are anticipated to be flexed in use; it evaluates the ability of the cable to withstand repeated and reversing torsional motion while subject to a specified temperature. The cable sample is mounted vertically into the testing apparatus with a clamp at the top and kept taught via a […] Read more

Watertightness

This test is performed on cables intended for routing through watertight bulkheads. Such cables must be particularly resistant to longitudinal water flow to prevent potential damage to internal systems. Pressurized water is applied at one end of the cable specimen, into the cable interior. A dry reservoir is placed below the opposite end of the […] Read more

Weight Loss Under Temperature and Vacuum

This test is used to evaluate the amount of weight lost, if any, from a wire specimen when exposed to temperature and vacuum for a period of several days. Test specimens are placed in a chamber where they are subject to pressure of 33 mm Hg and the wire’s rated temperature for 384 hours (16 […] Read more

Wire Color Designators and Munsell Limits

Insulation color is often used to identify a wire or cable’s system or function(s). This test evaluates the characteristics of an insulator’s color as compared to the limitations specified in the applicable standard. A visual examination of the color is made in comparison with either the MIL-STD-104 limit cards or the UV Munsell color limit […] Read more

Wrap

The wrap test evaluates the ability of a wire to cable insulation to resist cracking when wrapped around a mandrel. A test specimen (approximately 2 feet in length) is wrapped tightly around a specified diameter mandrel for two close turns. The sample is then removed from the mandrel and visually examined for damage or cracks […] Read more

Weathering Resistance

The weathering resistance test exposes wire specimens to UV light and condensation and evaluates for any effects on the insulation. Results of this test are particularly useful for components intended for use in an outdoor environment where conditions of varying UV light and condensation may be present Specimens are subject to 120 cycles of UV […] Read more

Topcoat Cure

In this test, the polyimide (or modified polyimide) topcoat of a sample wire is exposed to boiling water vapor and visually examined for cracking. The test sample is exposed to boiling water vapor for 1 hour atwhich point it is removed from the test fixture. A small segment is cut from the vapor-exposed wire and […] Read more

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