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EN ISO 16231-1: 2022 (Formerly EN 166)
Eye and face protection for occupational use 
Part 1: general requirements
This standard replaces the EN 166 standard of 2001 which replaced that of 1995.
 
Related Testing Standards:
 
EN ISO 16321-2: 2021. Eye and face protection for occupational use -
Part 2: Additional requirements for protectors used for welding
and related techniques

EN ISO 16321-3: 2022. Eye and face protection for occupational use -
Part 3: Additional requirements for mesh protectors.
(replaces the standards EN 166: 2001 and EN 175: 2006)
 
ISO 18526-1:2020. Eye and face protection — Test methods —
Part 1: Geometric optical properties.
 
ISO 18526-2: 2020. Eye and face protection - Test methods -
Part 2: physical optical properties
 
ISO 18526-3: 2020. Eye and face protection - Test methods -
Part 3: physical and mechanical properties.
 
The EN ISO 16321-1 standard specifies the mandatory and optional essential
requirements (according to manufacturer's claims or model) regarding eye and face
protectors: safety, design, optical, physical and mechanical requirements, maintenance,
instructions, marking…
 
This standard also brings together under the same document the following former standards:
EN 169: 2002. Filters for welding and allied techniques.
EN 170: 2002. Ultraviolet filters.
EN 171: 2002. Infrared filters.
EN 172: 1994. Sunglare filters for industrial use.
EN 379: 2003 + A1: 2009. Automatic welding filters.
 
 Key Similarities and Differences in Equipment Testing and Marking 

  Marking
EN 166 : 2001
Marking
EN 16321-1
 
Refractive power 1, 2, 3 No marking
If enhanced optical power is claimed, « 1 » can be marked on lens
Increased robusteness/Basic mechanical strength S No marking
UV filter For example 2-1,2
(Formerly  EN 170 : 2002)		 U 1,2
Sun glare filter For example 5-3 ,1
(Formerly  EN 172 : 1994)		 G3
IR filter For example 4-3
(Formerly EN 171 : 2002)		 R3
Welding filter For example 5
(Formerly EN 169 : 2002)		 W5
Resistance to high speed particles
45 m/s F C
80 m/s - D
120 m/s B E
190 m/s A -
For extremes of temperature FT, BT, ou AT CT, DT or ET
Resistance to high mass impact - HM or
HMT
(extremes of temperature)
Resistance to droplets and splashes of liquids 3 3
Resistance to dust particles 4 4
Resistance to fine dust particles 5 5
Protection against streams of liquid - 6
Protection against radiant heat - 7
Chemical resistance - CH
Protection against electric arc 8 -
Resistance to molten metals and hot solids 9 9
Resistance to surface damage by fine particles K K
Resistance to fogging N N
 
 
NOTE
Previously, 2 standard sizes of headforms on which equipment is tested,
namely medium and small, were the only possible options.
Six sizes of headforms are now specified. These are designated 1S, 1M, 1L, 2S, 2M and 2L.
 
However, by default, the 1-M type headform is used for the tests and remains the most common.


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For more information, it is possible to order the standards in English from BSI. (British Standard Institute).


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