ANSI Z87.1 covers many things but doesn't cover UV, visible light, IR or welding lenses. These ratings are NOT a requirement but optional. Most products just say ANSI Z87.1. I've never seen anything like ANSI Z87.1 W10 U3 IR3 L3. It's a good idea to check these things out before you make such a bold statement as, "it's completely false."
4. Optional testing is now available for dust and mist, as well as for UV (ultra violet), visible light and IR (infra red) filters. These tests are not mandatory, but if a manufacture wants to claim this specific performance the protectors must be tested and marked accordingly.
Welding lenses shall be marked W followed by shade number. UV protectors shall be marked U followed by scale number. IR protectors shall be marked R followed by scale number. A Visible Light filter (such as a gray lens for sun protection) shall be marked L followed by a scale number.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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