Which of the following is NOT included in a high velocity impact test according to ANSI Z87.1?

• A. Steel ball
• B. Fired 150 feet per second
• C. 500g object
• D. 0.25 inches in diameter

Answer: (C)

High velocity impact testing under ANSI Z87.1 uses a small steel sphere, 0.25 inches in diameter, fired at about 150 feet per second to simulate fast, small projectiles that could strike eyewear. The mass of that sphere is around 1 gram, so the test challenges the protective material with a defined energy level while keeping the projectile size and speed consistent. A 500-gram object would carry far more energy and isn’t part of this high velocity test; such a heavy mass would correspond to a different testing scenario and would not meet the standard’s specific projectile specification. So the 500 g item isn’t included in the high velocity impact test. The other elements—the steel ball, its 0.25-inch diameter, and the firing speed—are all part of the test criteria.