EN 208:2009

SLOVENSKI STANDARD
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Personal eye-protection - Eye-protectors for adjustment work on lasers and laser
systems (laser adjustment eye-protectors)
Persönlicher Augenschutz - Augenschutzgeräte für Justierarbeiten an Lasern und
Laseraufbauten (Laser-Justierbrillen)
Protection individuelle de l'oeil - Lunettes de protection pour les travaux de réglage sur
les lasers et sur les systèmes laser (lunettes de réglage laser)
Ta slovenski standard je istoveten z: EN 208:2009
ICS:
13.340.20 Varovalna oprema za glavo Head protective equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 208
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2009
ICS 13.340.20 Supersedes EN 208:1998
English Version
Personal eye-protection - Eye-protectors for adjustment work on
lasers and laser systems (laser adjustment eye-protectors)
Protection individuelle de l'œil - Lunettes de protection pour Persönlicher Augenschutz - Augenschutzgeräte für
les travaux de réglage sur les lasers et sur les systèmes Justierarbeiten an Lasern und Laseraufbauten (Laser-
laser (lunettes de réglage laser) Justierbrillen)
This European Standard was approved by CEN on 21 November 2009.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2009 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 208:2009: E
worldwide for CEN national Members.

Contents Page
Foreword .3
1 Scope .4
2 Normative references .4
3 Requirements .4
3.1 Spectral transmittance of filters and frames .4
3.2 Luminous transmittance of filters .5
3.3 Resistance of filters and frames to laser radiation .5
3.4 Refractive values of filters and eye-protectors .6
3.5 Quality of material and surface of filters .6
3.6 Stability of filters and eye-protectors to ultraviolet radiation and to elevated temperature .6
3.7 Resistance of filters and frames to ignition by contact with hot surfaces .7
3.8 Field of vision of eye-protectors .7
3.9 Construction of filters .7
3.10 Construction of frames .7
3.11 Mechanical strength of eye-protectors.7
4 Testing .8
4.1 General .8
4.2 Spectral transmittance of filters and frames .9
4.3 Luminous transmittance of filters .9
4.4 Resistance of filters and frames to laser radiation .9
4.5 Refractive value of filters and eye-protectors .9
4.6 Quality of material and surface of filters . 10
4.7 Stability to UV radiation and stability to elevated temperature . 10
4.8 Resistance of filters and frames to ignition by contact with hot surfaces . 10
4.9 Field of vision of eye-protectors . 10
4.10 Determination of the protected range. 10
4.11 Frames . 10
4.12 Mechanical strength . 10
5 Information supplied by the manufacturer . 11
6 Marking . 11
Annex A (informative) Principle . 14
A.1 Class 2 lasers . 14
A.2 Beam reduction and time base . 14
A.3 Resistance to laser radiation . 14
A.4 Example test report . 16
Annex B (informative) Recommended use of laser adjustment eye-protectors . 18
B.1 General . 18
B.2 Continuous wave lasers . 18
B.3 Pulsed lasers . 19
Annex C (informative) Significant technical changes between this European Standard and the
previous edition . 21
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 89/686/EEC . 22
Bibliography . 23

Foreword
This document (EN 208:2009) has been prepared by Technical Committee CEN/TC 85 “Eye protective
equipment”, the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by June 2010, and conflicting national standards shall be withdrawn at
the latest by June 2010.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 208:1998.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive(s).
For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document.
The significant technical changes between this European Standard and the previous edition are detailed in
Annex C.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
1 Scope
This European Standard applies to laser adjustment filters and eye-protectors. These are filters and eye-
protectors for use in adjustment work on lasers and laser systems as defined in EN 60825-1:2007 where
hazardous radiation occurs in the visible spectral range of 400 nm to 700 nm. Filters specified in this
European Standard reduce this radiation to values defined for lasers of class 2 (≤ 1 mW for CW (continuous
wave) lasers).
This European Standard defines the requirements, test methods and marking. A guide is given in Annex B
with regard to selection and use.
EN 207 applies to eye-protection against accidental exposure to laser radiation.
NOTE Before selecting eye protection according to this European Standard a risk assessment should first be
undertaken (see Annex B).
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
EN 166:2001, Personal eye-protection — Specifications
EN 167:2001, Personal eye-protection — Optical test methods
EN 168:2001, Personal eye-protection — Non-optical test methods
EN 207:2009, Personal eye-protection equipment — Filters and eye-protectors against laser radiation (laser
eye-protectors)
ISO 11664-1:2007, Colorimetry — Part 1: CIE standard colorimetric observers
ISO 11664-2:2007, Colorimetry — Part 2: CIE standard illuminants
3 Requirements
3.1 Spectral transmittance of filters and frames
When tested according to 4.2, the spectral transmittance values of the filters and the frames for the laser
wavelength shall be as given in Table 1.
Table 1 — Scale numbers, spectral transmittance and maximum laser power
Scale number Spectral transmittance CW and pulse Pulse lasers with
lasers with a a pulse duration
-9
Filter Frame
pulse duration of of > 10 s to
-4 -4
≥ 2 ×××× 10 s 2 ×××× 10 s
Maximum laser Maximum pulse
power energy
W J
-6
-2 -1 -1
RB 1 0,01 2 ×× 10
10 < τ (λ) ≤ 10 τ (λ) ≤ 10 ××
-3 -2 -2 -5
RB 2 0,1
10 < τ (λ) ≤ 10 τ (λ) ≤ 10 2 ×××× 10
-4
-4 -3 -3
RB 3 1 2 ×× 10
10 < τ (λ) ≤ 10 τ (λ) ≤ 10 ××
-5 -4 -4 -3
RB 4 10
10 < τ (λ) ≤ 10 τ (λ) ≤ 10 2 ×××× 10
-6 -5 -5 -2
RB 5 100
10 < τ (λ) ≤ 10 τ (λ) ≤ 10 2 ×××× 10

3.2 Luminous transmittance of filters
When tested in accordance with 4.3, the luminous transmittance of the filter relative to the D65 standard
illuminant (see ISO 11664-2:2007) shall be at least 20 %. However, luminous transmittance lower than
20 % can be accepted provided that the manufacturer supplies information related to the increase of the
intensity of illumination at the relevant workplace in accordance with Clause 5.
3.3 Resistance of filters and frames to laser radiation
When tested according to 4.4, the filters and frames shall meet the requirements of 3.1 and shall not lose their
protective effect under the influence of laser radiation of the power (E) or energy density (H) as specified in
Table 2 for a period of at least 5 s and for 50 pulses in case of pulsed lasers. The values of energy density (H)
-1/4
for testing the resistance against laser radiation for pulsed lasers should be multiplied with the factor N ,
-9 -4
where N is the number of pulses in 5 s, if the pulse durations is between 10 and 2 × 10 s and the pulse
-1
series is fast (frequency > 0,1 s ). The eye-protector shall not show any induced transmission (reversible
bleaching). No splinters shall come away from the side of the filter facing the eye under the influence of the
laser radiation. Any melting or other damage of the surface during the course of irradiation is not considered
neg
...