ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2004 09 17 Revised Para 3.0 inserted; para 3.1, 3.2, 3.3, 3.13 back-force (Ft) is to be measured at 24, 48, 96, 168 and every 168 h thereafter until 1,000 h has been reached. All measurements are to be made when fixture has cooled to 23 +/- 2 C. Ft/Fo x 100, min Hours % Retained 24 32 48 31 96 30 168 28 336 26 504 24 672 23 840 22 1008 21
