Understanding the ANSI/ISEA Z87.1 standard is essential for anyone working in environments where eye and face protection are necessary. This standard, developed by the American National Standards Institute and the International Safety Equipment Association, provides the benchmark for safety eyewear in the United States. It defines the minimum performance requirements for devices designed to protect against impacts, dust, splashes, and harmful radiation.
History and Major Revisions of ANSI Z87.1
The ANSI/ISEA Z87.1 standard has evolved significantly since its initial publication in 1979. The primary goal of these revisions has been to improve the correlation between laboratory test results and real-world performance. Early versions focused heavily on basic impact resistance, but modern iterations address a wider range of hazards, including optical clarity, fit, and coverage.
A major shift occurred with the 2010 update, which introduced distinct markings to differentiate between high-velocity impact ratings and basic impact ratings. This change was crucial for ensuring that users select the appropriate level of protection for their specific task. The most recent significant revision occurred in 2020, which further aligned the standard with international regulations and clarified requirements for filters and welding shields.
Understanding the Z87.1 Marking System
One of the most important aspects of the standard is the marking system stamped directly onto the lens or frame. This small stamp communicates the level of protection the eyewear provides. Deciphering these marks is the first step in verifying that your gear is suitable for the job at hand.
For basic impact protection, you will typically see a "Z87" mark. If the rating is for high-velocity impact, the marking will be "Z87+". A "Z87-2010" mark indicates the lens passed the specific tests required by the 2010 revision. Finally, "Z87-2020" signifies compliance with the latest standards, covering both impact and non-impact hazards like splashes and UV exposure.
Key Differences Between High Velocity and Basic Impact
The distinction between high-velocity and basic impact protection is critical for safety. Basic impact tests involve a 1-inch steel ball dropped from a specified height, while high-velocity impact simulates a projectile traveling at 150 feet per second.
High-velocity impact testing uses a 1/4-inch steel ball fired at high speed.
Only eyewear passing the high-velocity test can bear the "Z87+" marking.
Safety glasses rated only "Z87" are suitable for low-impact tasks, such as maintenance or laboratory work.
Tasks involving grinding, chipping, or machining require the "Z87+" rating to ensure the eyewear will not shatter or dislodge.
Coverage and Fit Considerations Beyond the impact rating, the 2020 standard places a strong emphasis on coverage and fit. A lens might stop a particle, but if it slips down the nose or allows debris to enter from the sides, it fails in its purpose. The updated regulations test for peripheral coverage and the ability of the frame to maintain seal integrity. Direct ventilation is another factor addressed in the standard. While indirect vents help prevent chemical splashes from entering the eye area, they can sometimes cause fogging. The standard defines acceptable levels of ventilation to balance protection against fogging, ensuring the user maintains clear vision without compromising safety. Optical Clarity and Lens Materials
Beyond the impact rating, the 2020 standard places a strong emphasis on coverage and fit. A lens might stop a particle, but if it slips down the nose or allows debris to enter from the sides, it fails in its purpose. The updated regulations test for peripheral coverage and the ability of the frame to maintain seal integrity.
Direct ventilation is another factor addressed in the standard. While indirect vents help prevent chemical splashes from entering the eye area, they can sometimes cause fogging. The standard defines acceptable levels of ventilation to balance protection against fogging, ensuring the user maintains clear vision without compromising safety.
No safety lens should distort vision, and ANSI Z87.1 enforces strict tolerances for optical clarity. Lenses are tested for prismatic power and astigmatism to ensure they do not cause visual fatigue during extended wear. The standard recognizes various lens materials, including polycarbonate, Trivex, and CR-39, each offering different balances of impact resistance, weight, and optical quality.
