EN 812:2012 - Industrial bump caps
In addition to the Standard number, manufacturer and model identification:
size or size range (cm) (on both shell and, if fitted,
harness)
year and quarter of manufacture
informative label with specified wording
Optional requirements -20o
C or -30o
C - tested at very low temperature
F - resistant to flame
440 V (a.c.) - tested for electrical insulation