A-A-2122F
and backward stroke. Any structural breakage, loosening or deformation of parts which affects the stability or serviceability of the stand or any change which could cause personal injury to a user shall constitute failure of the test.
4.8 Test of top levelness, deflection, and rigidity. The castors shall be removed. A straight edge shall be placed diagonally (corner to corner) across the unit top. The
straight edge shall extend beyond the corners. Any warp of the top in excess of 0.78 mm is cause for rejection. This test shall be performed across both corner diagonals. Upon satisfactory completion of the above test, a weight of not
less than 128.2 kg. shall be applied for at least 5 minutes to an area not to exceed 304.8 mm in diameter. The test area
shall be the center of the top. The top shall not deflect more than 3.2 mm during the test. After removal of the load, no
part of the stand shall have any permanent deformation.
4.9 Levelness of leaves and test for drop leaf support. The casters shall be removed and the leaves raised to the horizontal position supported by the leaf supports. A straight edge shall be placed across the stand top extending to the outside edge of the leaf top. The vertical measurement from
the bottom of the straight edge to the top of the outside edge of the leaf shall not be greater than 3.2 mm nor shall the
leaf support hold the leaf in a position higher than the top. The test shall be performed on both the right and left leaves. After this portion of the test is performed, a test load of
11.3 kg shall be applied to each leaf for a period of 5 minutes. The load shall be evenly distributed in the area extending from the side edge of the top to within 50.4 mm of the end of the leaf. Upon removal of the load and with the leaves still in the horizontal position, the measurements shall be repeated, using the straight edge. Any difference in
the measurement taken before and after the load was applied in excess of 1.6 mm shall constitute failure of this part of the test.
4.10 Chromium plating test. Plated samples shall be tested for corrosion with the 5 percent neutral salt spray at 35°C in accordance with ASTM Test Method B-117. The test period shall not be less than 48 hours. After the specified exposure is completed, the specimen shall be visually examined to assure that the plating shows no evidence of peel, chip, uneven
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