ASTM D470-21 PDF Download

The ASTM D470-21 standard provides procedures for testing crosslinked insulations and jackets used in wire and cable manufacturing. The standard emphasizes the importance of physical tests in determining the physical properties and performance of the insulation or jacket throughout its service life. These tests are crucial for research and development, engineering design, quality control, and acceptance or rejection under specifications.

It should be noted that these test methods do not apply to flexible cords and are specifically designed for crosslinked insulations and jackets. The standard clarifies that tests are conducted on insulated or jacketed wire or cable solely to determine the relevant properties of the insulation or jacket, rather than testing the conductor or completed cable itself.

The standard includes a comprehensive list of test methods, such as AC and DC Voltage Withstand Tests, Capacitance and Dissipation Factor Tests, Cold Bend Tests, Double AC Voltage Test, Electrical Tests of Insulation, Heat Distortion Test, Horizontal Flame Test, Insulation Resistance Tests on Completed Cable, Mineral Filler Content Determination, Ozone Resistance Test, Partial-Discharge Test, Physical Tests of Insulation and Jacket Compounds, Surface Resistivity Test, Track Resistance Test, U-Bend Discharge Test, Water Absorption Tests, and more.

Wherever applicable, the standard provides two sets of values in different units, with the values in the first set being the standard and those in parentheses serving as supplementary information. These test methods play a critical role in ensuring the quality and performance of crosslinked insulations and jackets used in wire and cable applications.