I am not sure about the entire thread but specifically the Z87.1-2010+ impact rating test for mass and velocity carried over from the previous impact rating for Z87.1-2003 unchanged.
Quote:
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High Mass and High Velocity Impact forces to be tested remain essentially the same as the prior standard. The high mass pointed projectile is pointed and weighs 500 grams and is dropped from a height of 50 inches. The high velocity test uses a steel ball .25 inches in diameter that is fired at 150 feet per second at the lens in the test frame.
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The .25 inch diameter steel ball launched at 150 FPS is about 1.09 joules of force. The 500 gram pointed object dropped from 50 inches impacts with about 6.22 joules.
Z87.1 without the "+" is not impact rated and does not have to meet either of the above tests so it does not have a 1 joule rating.