The “Z87+” marking on safety glasses refers to the ANSI Z87.1-2020 standard for eye and face protection devices that was established by the American National Standards Institute (ANSI).
The Z87.1 rating itself indicates that the glasses meet certain basic impact protection requirements.
The “+” sign signifies that the glasses meet the additional high-impact standards. Specifically, this means the lenses and frames have passed testing for high-velocity and high-mass impact.
Here is what these tests involve:
- High-Velocity Impact: This test involves shooting a quarter-inch steel ball at the lens at a speed of 150 feet per second. To pass, the lens must not crack, chip, or break.
- High-Mass Impact: This test involves dropping a 500-gram pointed weight from a height of roughly 50 inches onto the lens. To pass, the lens and frame must retain their structural integrity without any part breaking off.
So, safety glasses marked with “Z87+” offer a higher level of protection compared to those marked with only “Z87”, making them suitable for riskier environments where flying objects or particles are a concern.
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