Permissible Variation in Electrical Resistance

Section 10 of ASTM B267 covers the temperature coefficient of resistance test for wire-wound resistor wire. This measures how the resistance of the alloy wire changes with temperature.The mean temperature coefficient of resistance (TCR) is a critical property for precision resistor applications. Different alloy classes have different TCR values, which determine the stability of the […] Read more

Thermal EMF with Respect to Copper

Section 9 of ASTM B267 covers the test for nominal electrical resistance per unit length for resistance wire. The nominal resistance per unit length for round wire is calculated from the nominal resistivity and the nominal cross-sectional area.For ribbon or flat wire produced by rolling from round wire, the cross section departs from a true […] Read more

Microscopical Examination

Section 11.2 of ASTM B187 covers the bend testing requirements for copper bus bar, rod, and shapes. The test specimen is bent around a mandrel of specified diameter to evaluate ductility.The test determines whether the copper product can be formed without cracking or surface defects. The mandrel diameter is related to the product thickness, with […] Read more

Rockwell Harndess

Section 10.2 of ASTM B187 covers the tensile testing requirements for copper bus bar, rod, and shapes. The test specimen is prepared and tested in accordance with standard tensile test methods to determine mechanical properties.The tensile test measures ultimate tensile strength, yield strength (if specified), and elongation at fracture. These properties verify that the copper […] Read more

Continuious Lengths

This test evaluates the continuious lengths of wire specimens as specified in AS81044. The test is performed in accordance with the procedures defined in the standard to verify compliance with the applicable requirements.Test specimens are prepared and conditioned as specified, then subjected to the defined test procedure. Results are compared against the acceptance criteria established […] Read more

Hot Oil Test

This test evaluates the resistance of wire to degradation when exposed to specified fluids as specified in AS654. Specimens are immersed in the test fluid at the specified temperature for the required duration, then tested for changes in physical and/or electrical properties.Fluid resistance testing is essential for products used in environments where exposure to fuels, […] Read more

Low Temperature Test

This test evaluates the performance of wire when exposed to low temperature conditions as specified in AS654. Specimens are conditioned at the specified low temperature, then subjected to mechanical stress (typically bending or impact) while still cold to evaluate cold-weather performance.Low temperature testing is critical for products used in aerospace, military, and outdoor applications where […] Read more

High Temperature Test

This test evaluates the performance of wire when exposed to high temperature conditions as specified in AS654. Specimens are placed in a temperature-controlled chamber at the specified temperature for the required duration, then evaluated for physical and electrical property changes.High temperature testing verifies that the product maintains adequate performance at its rated maximum operating temperature, […] Read more

Wire Conditioning Prior to 5.2.5thru 5.2.10

This test evaluates the wire conditioning prior to 5.2.5thru 5.2.10 of wire specimens as specified in AS6324. The test is performed in accordance with the procedures defined in the standard to verify compliance with the applicable requirements.Test specimens are prepared and conditioned as specified, then subjected to the defined test procedure. Results are compared against […] Read more

Thermal Softening Behavior

This test evaluates the thermal softening behavior of wire specimens as specified in AS6324. The test is performed in accordance with the procedures defined in the standard to verify compliance with the applicable requirements.Test specimens are prepared and conditioned as specified, then subjected to the defined test procedure. Results are compared against the acceptance criteria […] Read more

Archives