TECHNICAL DEVELOPMENT REPORT NO. 360 The Increase In Fire-Resistance Provided By Fire-Retardant Coating On Aluminum And Magnesium Sheet

摘要

Equipment and a test procedure were developed for determining the increase in fire-resistance provided to aluminum and magnesium alloy sheet materials by fire-retardant coatings. The equipment and procedure were used for conducting tests of Albi 99 and Albi 107 fire-retardant coatings and of Midland 7X2039 heat-resistant paint. The effectiveness of Albi Top koter and Albi Top Koter M when applied to Albi 99 and Albi 107 also was evaluated. Aluminum and magnesium panels, 12 inches square, were found to be of a convenient size for application and evaluation of the coatings; however, several 24-inch-square aluminum panels coated with Albi fire-retardant coatings also were fire-tested in order to determine the effect of larger panels. The coated panels were tested by exposure to a 2,000° F. flame produced by a torch used previously for con-ducting fire-resistance tests of firewall and other materials. The time required for the test panels to reach temperatures of 500° and 600° F. was used as a measure of the increase in fire-resistance provided by the protective coatings, since the strength of aluminum and magnesium sheets is reduced at temperatures in that range. However, the tests were continued beyond that time, and until the metal softened to the extent that one of the thermocouple probes pushed through the panel, thus breaking contact.