Section 142.27 - Eye and face protection(a) Personnel engaged in or observing welding, grinding, machining, chipping, handling hazardous materials, or acetylene burning or cutting shall wear the eye and face protector specified for the operation in Figure 8 of ANSI Z87.1.(b) Eye and face protectors must be maintained in good condition.(c) Each eye and face protector must be marked with the information required by ANSI Z87.1 for that type of protector.