No they don't: hard hats, or safety helmets, have a 'use by date' or a 'working life'. Section 3 of Australian Standard AS/NZ 1800:1998 details the "Care and Maintenance of Occupational Protective Helmets" and Section 3.4 covers the "Working Life". The Australian Standard specifies a 3 year replacement date - from the date of issue . Each helmet, when manufactured, has a year and month of manufacture stamped onto the inside of the shell near the peak for easy reading. The arrow in the stamp points to the month and the arrow overlays the arrow. For example, if the arrow points to 9 and the number is 05 - then the helmet was manufactured in September 2005. If the helmet has been used regularly, it should be replaced after 3 years from the date of issue. The date of issue should be marked on an additional sticker on the inside of the helmet as the back of the shell. The date of issue may not be the same as the date of manufacture.
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