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gSih 01709lafng�e- <br />a in live laboratories. it was found that. limits) when applied to Wr" over the impact <br />t quare root function. when applied to failure range of 85 to 800 g. Statistical anul�sis <br />,,observed values of impact failure weight W, demonstrated that overall variation was about <br />re,ulted in a stable value for the within -labors- s 1.44 (two -sigma limits) when applied to Wf" <br />tory standard deviation of measurement. The over this same WF range including between- <br />teithin-laboratory-and-apparatus (but between laboratory -and -apparatus variations (see Rec- <br />operator-and-day) analytical precision has been ommended Practice E 07). <br />demonstrated to be about =0.90 (two -sigma <br />Support Shaft <br />660mm (26") — Method A <br />1524mm (60") -Method 8 <br />Compressed Art <br />L. n e —. <br />--Electromagnet <br />Centering <br />Adapter <br />Fat DartYIAgrass-95 (0.38 <br />Center Hole <br />Clamping Cyl,nders <br />Movable Clamp R•-; <br />and Gasket <br />Stot.onary Clamp <br />Rinq and Gasket <br />Spec men, Between <br />Gaskets <br />Adjustable <br />Bracket <br />Foam Rubber I <br />Dart Stop <br />1 <br />u <br />Lvzend Dart Assembly, <br />>. Steel shaft tip 6.1 mm 10.3 in.WD by 12.? mm 10.30 in i lung. <br />S. Dart shaft. 6.4 mm 10 23 in. i OD and at least 113 mm 11.3 m.i long: 1. 20 thd. (N C.) 12.7 mm 10.30 in.) Ione un bottom <br />\o 3-30 thd. I `.F.) for steel tip. t• <br />C. Hemispherical head: Nfethod A-38.10 = 0.13 mm 11.:00 . 0.003 in.) in diameterINfethod B-30.80 . 0.13 mm (2 000 <br />0003 in.) in diameter. <br />D. Removable %eights. <br />E. Collar and screw. <br />FIG. 1 Apparatus for Free -Falling Dart Impact Test for Polyethylene Film. <br />93 <br />