They are not a substitute for a product sellers or users own judgment with respect to the particular product referenced in the standard or guideline, and NEMA does not undertake to guarantee the performance of any individual manufacturers products by virtue of this standard or guide. Thus, NEMA expressly disclaims any responsibility for damages arising from the use, application, or reliance by others on the information contained in these standards or guidelines. While exploring the technology of metallurgical composites, laboratories in several companies uncovered surprising facts that led to the discovery of a new category of electrical grade aluminum alloys. As a result of this research, aluminum alloys were developed with excellent electrical and mechanical properties. Aluminum conductors were in great demand in the 1960s, primarily due to the limited availability of copper.