SIST EN 168:2002

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Personal eye-protection - Non-optical test methodsProtection individuelle de l'oeil - Méthodes d'essais autres qu'optiquesPersönlicher Augenschutz - Nichtoptische Prüfverfahren13.340.20Varovalna oprema za glavoHead protective equipmentICS:SIST EN 168:2002enTa slovenski standard je istoveten z:EN 168:200101-junij-2002SIST EN 168:2002SLOVENSKI
STANDARDSIST EN 168:19961DGRPHãþD







EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 168November 2001ICS 13.340.20Supersedes EN 168:1995English versionPersonal eye-protection - Non-optical test methodsProtection individuelle de l'oeil - Méthodes d'essais autresqu'optiquesPersönlicher Augenschutz - Nichtoptische PrüfverfahrenThis European Standard was approved by CEN on 2 September 2001.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the 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 translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2001 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 168:2001 E



EN 168:2001 (E)2ContentspageForeword.41Scope.52Normative references.53Test for increased robustness.53.1Unmounted oculars.53.1.1Apparatus.53.1.2Procedure.63.2Complete eye-protectors and frames.63.2.1Apparatus.63.2.2Procedure.73.2.3Points of impact.74Test for minimum robustness of oculars with filtering effect and cover plates.84.1Apparatus.84.1.1Loading device.84.1.2Specimen support.84.2Procedure.85Test for stability at elevated temperature.95.1Apparatus.95.2Procedure.96Test for resistance to ultraviolet radiation.106.1Apparatus.106.2Procedure.107Test for resistance to ignition.107.1Apparatus.107.2Procedure.108Test for resistance to corrosion.109Test for resistance to high-speed particles and resistance to high speed particles at extremesof temperature.119.1Apparatus.119.1.1Head-form.119.1.2Propulsion equipment.119.2Procedure.119.2.1Resistance to high speed particles.119.2.2Resistance to high speed particles at extremes of temperature.1210Test for protection against molten metals.1210.1Test for non-adherence of molten metals.1210.1.1Principle.1210.1.2Apparatus.1210.1.3Procedure.1310.2Test for area of coverage of face shields.1410.2.1Principle.1410.2.2Apparatus.1410.2.3Procedure.1410.2.4Evaluation.1411Test for resistance to penetration by hot solids.1511.1Apparatus.1511.2Procedure.1612Test for protection against droplets and liquid splashes.1612.1Test for protection against droplets (for goggle type eye-protectors).1612.1.1Apparatus.16



EN 168:2001 (E)312.1.2Procedure.1612.1.3Evaluation.1712.2Test for protection against liquid splashes (for face-shields).1713Test for protection against large dust particles.1713.1Apparatus.1713.2Procedure.1813.3Evaluation.1814Test for protection against gases and fine dust particles.1914.1Apparatus.1914.2Procedure.2014.3Evaluation.2015Test for resistance to surface damage by fine particles.2015.1Apparatus.2015.1.1Falling sand apparatus.2015.1.2Sand.2015.1.3Measuring apparatus.2015.1.4Reference samples.2015.2Samples.2015.3Procedure.2115.4Evaluation.2116Test for resistance to fogging of oculars.2316.1Apparatus.2316.2Samples.2416.3Procedure and evaluation.2417Head-form.2518Assessment of Field of Vision.2819Assessment of lateral protection.2919.1Apparatus.2919.2Procedure.2919.3Evaluation.29Annex A (informative)
Uncertainty of measurement and results interpretation.30A.1Test report and uncertainty of measurement.30Annex ZA (informative)
Clauses of this European Standard addressing essential requirements or otherprovisions of EU Directives.32



EN 168:2001 (E)4ForewordThis European Standard has been prepared by Technical Committee CEN /TC 85, "Eye-protective equipment", thesecretariat 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 orby endorsement, at the latest by May 2002, and conflicting national standards shall be withdrawn at the latest byMay 2002.This document replaces EN 168:1995.This European Standard has been prepared under a mandate given to CEN by the European Commission and theEuropean 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 standard.The annexes A and ZA are informative.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden,Switzerland and the United Kingdom.



EN 168:2001 (E)51 ScopeThis European Standard specifies non-optical test methods for eye-protectors, the requirements for which arecontained in other European Standards.Alternative test methods may be used if shown to be equivalent.The optical test methods are given in EN 167.A definition of terms is given in EN 165.2 Normative referencesThis European Standard incorporates by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text, and the publications are listed hereafter. Fordated references, subsequent amendments to or revisions of any of these publications apply to this EuropeanStandard only when incorporated in it by amendment or revision. For undated references the latest edition of thepublication referred to applies (including amendments).EN 165, Personal eye-protection — Vocabulary.EN 166, Personal eye-protection — Specifications.EN 167, Personal eye-protection — Optical test methods.ISO 565, Test sieves — Metal wire cloth, perforated metal plate and electroformed sheet — Nominal sizes ofopenings.3 Test for increased robustnessNew specimens shall be used for this test.3.1 Unmounted oculars3.1.1 ApparatusThe support for the ocular (see Figure 1) shall be a steel or rigid plastic cylinder with an internal diameter of(35,0 ± 0,1) mm and an outside diameter of (41,0 ± 0,1) mm. The cylinder shall be inserted into, or be an integralpart of a steel base. The ocular shall be cushioned by a silicone seating ring firmly attached to the top of the tube.This seating ring shall be made of silicone rubber of (40 ± 5) I.R.H.D and shall have an inside diameter of(35,0 ± 0,4) m and cross sections of 3 mm x 3 mm nominal dimensions.The combined mass of the support shall be at least 12 kg.A load ring of mass (250 ± 5) g is placed on the ocular. The ring has an inside diameter the same as that of thesupport tube, and any convenient outside diameter. A silicone seating ring having the same dimensions andhardness as the one attached to the top of the support tube is placed between the load ring and the ocular. A pieceof carbon paper on a piece of white paper is placed at the base of the 1,5 mm deep cavity in the ocular support(see Figure 1).For curved oculars with a cylindrical component, the test support tube and load ring shall be curved to conform tothe concave and convex surfaces of the ocular respectively, and the dimensions of 3 mm and 4,5 mm shall apply tothe deepest point of the circular support. (See Figure 1).If the ocular is of insufficient dimensions to enable its entire periphery to be adequately supported, suitable adaptorsleeves shall be used.



EN 168:2001 (E)63.1.2 ProcedureCentre the intended points of impact of the ocular on the support tube. Adjust the apparatus so that a 22 mmnominal diameter steel ball of 43 g minimum mass falling from (003,03,1) m strikes the ocular within a 5 mm radiusfrom the centre of the support tube. This height will provide an impact speed of approximately 5,1 m/s.Impacts shall be directed at the visual centre(s) of the oculars. For unmounted oculars covering one eye and forwhich the visual centre cannot be established, then the geometric centre shall be used.NOTEVisual centre is as defined in EN 166.The impacts are carried out in the following conditions:a) with the ocular heated to (55 ± 2) °C and maintained at this temperature for at least 1 h;b) with the ocular cooled to a temperature of (-5 ± 2) C and maintained at this temperature for at least 1 h.New oculars shall be used for each individual impact and for each temperature condition. The impact shall beapplied within 30 s of temperature conditioning.The test shall be carried out at (23 ± 5) °C.Dimensions in millimetres (nominal unless toleranced)Key1Supporting plate (12 kg minimum)2Silicone seating rings3Ocular4Load ring (250
5) g5Carbon paper on white paperFigure 1 — Holding device for oculars for the increased robustness test3.2 Complete eye-protectors and frames3.2.1 Apparatus3.2.1.1Appropriate head-form, as defined in clause 17.



EN 168:2001 (E)73.2.1.2A device enabling a 22 mm nominal diameter steel ball of 43 g minimum mass to be projected at aspecified point on the eye-protector at a speed of approximately 5,1 m/s.3.2.2 ProcedureThe eye-protector to be tested shall be placed on the appropriate head-form in the position corresponding tonormal use.If the frame only is to be assessed then oculars meeting the requirements of 3.1 (increased robustness) shall befitted to the frame.A sheet of carbon paper on top of a sheet of white paper is attached to the head-form behind the eye-protector.The head-form and eye-protector assembly is positioned in the test apparatus.The ball is projected at the points of impact defined in 3.2.3.For spectacles with no lateral protection the ball shall strike the sidearm within the prescribed lateral protection areaon a vertical plane through the impact centre. (See 3.2.3).The impacts are carried out in the following conditions:a) with the eye-protector heated to (55 ± 2) °C and maintained at this temperature for at least 1 h;b) with the eye-protector cooled to a temperature of (-5 ± 2) °C and maintained at this temperature for at least 1 h.New eye-protectors shall be used for each individual point of impact and for each temperature condition. Theimpact shall be applied within 30 s of temperature conditioning.The tests shall be conducted at an ambient temperature of (23 ± 5) °C.3.2.3 Points of impactThere are four impact points, and these are defined with respect to the head-form rather than the eye-protector.The ball is aimed at these impact points with the eye-protector mounted in the normal use position.The impact points shall be considered as any single point within a 10 mm radius of one of four impact centres.These impact centres are denoted by an asterisk (*) in Figure 11.With respect to the test schedule contained in EN 166, the four impact points are defined as follows:1. the left eye frontal;2. the right eye frontal;3. the left eye side;4. the right eye side.For frontal impacts at the two eye centres the ball is projected normal to the vertical axis of the head-form andparallel to its optical axis along each line of sight.For lateral impacts the head-form is rotated about its vertical axis by 90 (left and right) from the frontal impactposition.The head-form may be moved horizontally and vertically to select any single impact point lying within 10 mm of thespecified impact centres.As stated in 3.2.2, new eye-protectors shall be used for each individual impact.



EN 168:2001 (E)84 Test for minimum robustness of oculars with filtering effect and cover platesNew specimens are used for this test.4.1 ApparatusSee Figure 2.4.1.1 Loading deviceA steel ball of 22 mm nominal diameter is fastened to the lower end of a tube, whose length is 70 mm nominal.The total loading mass is such that the force acting on the ocular is (100 ± 2) N.4.1.2 Specimen supportThe support for the ocular (see Figure 2) shall be a steel cylinder with an internal diameter of (35,0 ± 0,1) mm andan outside diameter of (41,0 ± 0,1) mm. The cylinder shall be inserted into, or be part of, a steel base.The specimen is placed between two seating rings made of silicone rubber of (40 ± 5) I.R.H.D. having an insidediameter of (35,0 ± 0,4) mm and cross sections of 3 mm x 3 mm nominal dimensions. The silicone seating rings arefixed to the steel supporting plate and the load ring respectively.If the specimen ocular is of insufficient dimensions to enable its entire periphery to be adequately supported,suitable adaptor sleeves shall be used.The load ring shall have a mass of (250 ± 5) g. By its weight, it presses the upper silicone seating ring against theupper surface of the specimen.A sheet of carbon paper on top of a sheet of white paper is placed on the supporting steel plate at the base ofthe 1,5 mm deep cavity.4.2 Procedure4.2.1The test is carried out at (23 ± 5) °C.4.2.2Align the central vertical axis of the loading tube with that of the specimen support.4.2.3Position the specimen on the support with the ”eye side” downwards and place the load ring on thespecimen. For curved oculars with a cylindrical component the supporting plate and the load ring are curved toconform to the surface of the ocular, and the dimensions of 3 mm and 4,5 mm shall apply to the deepest point ofthe circular support.4.2.4Adjust the position of the specimen such that the load ring axis (4.2.2) passes through the visual centre ofthe specimen. If the visual centre cannot be established the geometric centre shall be used.NOTEVisual centre is as defined in EN 166.4.2.5The loading mass is lowered on to the ocular at a speed not exceeding 400 mm/min. The forceof (100 ± 2) N is maintained for (10 ± 2) s. The loading mass is then removed.



EN 168:2001 (E)9Dimensions in millimetres (nominal unless toleranced)Key1Supporting plate2Silicone seating rings3Guiding block4Loading mass (100
2) N5Steel ball6Load ring (250
5) g7Carbon paper on white paper8OcularFigure 2 — Apparatus for minimum robustness (static deformation) test5 Test for stability at elevated temperatureNew specimens are used for this test.5.1 ApparatusOven, capable of maintaining a temperature of (55 ± 2) °C.5.2 ProcedurePlace the specimen in a position corresponding to normal use, in the oven for (60 ± 5) min at a temperature of(55 ± 5) °C. Then remove it and allow to stabilise at (23 ± 5) °C for a minimum of 60 min prior to visual examination.



EN 168:2001 (E)106 Test for resistance to ultraviolet radiation6.1 ApparatusFused-silica envelope high-pressure xenon lamp. The power of the lamp shall be between 400 W and 500 W, witha preferred value of 450 W. The spectral transmittance of the lamp envelope shall be at least 30 % at 200 nm.NOTESuitable lamp references are XBO-450 W/4 and CSX-450 W/4. These lamps produce UV radiation with anappreciable amount of UVC radiation. This is appropriate, since industrial processes (for example, welding) produce appreciableamounts of UVC radiation.WARNINGPrecautions should be taken against potential generation and build up of ozone.6.2 ProcedureNew specimens are used for this test. The test equipment is operated within an environment of temperature(23 ± 5) °C.Expose the external face of the ocular to radiation from a fused silica envelope high-pressure xenon lamp (see 6.1).The angle of incidence of the radiation on the specimen surface shall be essentially perpendicular. The distancefrom the axis of the lamp to the nearest point on the sample shall be (300 ± 10) mm. The exposure time shall be(50 ± 0,2) h at a lamp power of 450 W.New lamps shall be burned in for (50 ± 0,2) h.7 Test for resistance to ignition7.1 Apparatus7.1.1Steel rod, (300 ± 3) mm long and 6 mm nominal diameter with end faces which are flat and perpendicularto its longitudinal axis.7.1.2Heat source.7.1.3Thermocouple and temperature indicating device.7.1.4Timer, capable of measuring an elapsed time of 10 s with an uncertainty of ± 0,1 s.7.2 ProcedureHeat one end of the steel rod over a length of at least 50 mm to a temperature of (650 ± 20) °C. Measure thetemperature of the rod by means of the thermocouple attached at a distance of (20 ± 1) mm from the heated end ofthe rod. Press the heated face of the rod (long axis vertically) against the surface of the test sample (the contactforce being equal to the weight of the rod) for a period of (5,0 ± 0,5) s, and then remove it.Carry out the test on all externally exposed parts of the eye-protector, except elastic headbands and textile edging.Carry out a visual inspection during the test in order to establish whether the test samples ignite or continue toglow.The tests are performed in an environment of temperature (23 ± 5) °C.8 Test for resistance to corrosionRemove all contamination, particularly oil and grease from the metal parts of the specimen.Immerse the specimen for (15 ± 1) min in a boiling, aqueous, (10,0 ± 0,5) % by mass solution of sodium chloride.



EN 168:2001 (E)11Remove the specimen from this solution and immerse immediately in a (10,0 ± 0,5) % by mass aqueous solution ofsodium chloride at room temperature for (15 ± 1) min.Remove from this solution and without wiping off the adhering liquid, leave to dry for (24 ± 1) h at (23 ± 5) °C. Rinsein lukewarm water and leave to dry before inspecting.9 Test for resistance to high-speed particles and resistance to high speed particles atextremes of temperatureNew specimens shall be used for this test and each specimen shall only be subjected to one impact.9.1 Apparatus9.1.1 Head-formAppropriate head-form, as defined in clause 17.9.1.2 Propulsion equipmentThe apparatus shall be capable of imparting known speeds of up to 195 m/s to a 6 mm nominal diameter steel ballof 0,86 g minimum mass.NOTE 1The apparatus consists fundamentally of a barrel or tube of sufficient length to ensure a reproducible exit speed ofthe steel ball, with a breech or loading mechanism ensuring that the ball is in a given position in relation to the tube or barrelend, and of a spring or compressed gas to provide propulsion.The apparatus also includes a means of calibrating or measuring the exit speed of the ball; because of the speedand distances involved, a timing indicator, recording in multiples of not greater than 10 s is required.The measurement of speed should be made as near as possible to the point of impact. The end of the barrel ortube should be protected against ricochets.The area surrounding the test specimen, the head-form and the barrel or tube should be enclosed.NOTE 2The tube length should be chosen to ensure that the required speed for the ball is achieved.NOTE 3For the time measurement, a method using an electronic timer operated
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