1、Personal eye-protection Non-optical test methods The European Standard EN 168:2001 has the status ofa British Standard ICs 13.340.20 BS EN 168:2002 A present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monito
2、r related international and European developments and promulgate them in the UK. - A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cr oss-r e fer enc e s The British Standards which implement international or European publications referred to in
3、this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. U
4、sers of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 32, an inside back cover
5、 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. O BSI 28 January 2002 ISBN O 580 38914 6 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 168 November 2001 ICs 13.340.20 Supersedes EN 168:1995 English version Personal eye-protecti
6、on - Non-optical test methods Protection individuelle de loeil - Mthodes dessais autres quoptiques Persnlicher Augenschutz - Nichtoptische Prfverfahren This European Standard was approved by CEN on 2 September 2001 CEN members are bound to comply with the CENKENELEC Internal Regulations which stipul
7、ate 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 Management Centre or to any CEN member. This European Standard exist
8、s 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 Management Centre has the same status as the official versions. CEN members are the national standards bodies
9、 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 STANDARDIZATION EUROPISCHES KOMITEE FUR NORMUNG COMIT EUROPEN DE NORMALISATION Ma
10、nagement Centre: rue de Stassart, 36 B-1050 Brussels O 2001 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 168:2001 E EN 168:2001 (E) Contents page Foreword 4 1 2 3 3.1 3.1 . 1 3.1.2 3.2 3.2.1 3.2.2 3.2.3 4 4.1 4.1 . 1 4.1.2 4.2 5
11、 5.1 5.2 6 6.1 6.2 7 7.1 7.2 8 9 9.1 9.1 . 1 9.1.2 9.2 9.2.1 9.2.2 10 10.1 10.1.1 10.1.2 10.1.3 10.2 10.2.1 10.2.2 10.2.3 10.2.4 11 11.1 11.2 12 12.1 12.1.1 2 Scope 5 Normative references 5 Test for increased robustness 5 Unmounted oculars . 5 Apparatus . 5 Procedure . 6 Complete eye-protectors and
12、frames 6 Apparatus . 6 Procedure . 7 Points of impact . 7 Test for minimum robustness of oculars with filtering effect and cover plates . 8 Apparatus . 8 Loading device . 8 Specimen support 8 Procedure . 8 Test for stability at elevated temperature 9 Apparat us . 9 Procedure . 9 Test for resistance
13、to ultraviolet radiation 10 Apparatus . IO Procedure . IO Test for resistance to ignition . 10 Apparatus . IO Procedure . IO Test for resistance to corrosion . IO Test for resistance to high-speed particles and resistance to high speed particles at extremes of temperature 11 Apparatus . 11 Head-form
14、 . II Propulsion equipment . 11 Procedure . II Resistance to high speed particles II Resistance to high speed particles at extremes of temperature 12 Test for protection against molten metals 12 Test for non-adherence of molten metals . 12 Principle 12 Apparatus . 12 Procedure . 13 Test for area of
15、coverage of face shields 14 Principle 14 Apparatus . 14 Procedure . 14 Evaluation . 14 Test for resistance to penetration by hot solids . 15 Apparatus . 15 Procedure . 16 Test for protection against droplets and liquid splashes 16 Test for protection against droplets (for goggle type eye-protectors)
16、 . 16 Apparatus . 16 EN 168:2001 (E) 12.1.2 12.1.3 12.2 13 13.1 13.2 13.3 14 14.1 14.2 14.3 15 15.1 15.1.1 15.1.2 15.1.3 15.1.4 15.2 15.3 15.4 16 16.1 16.2 16.3 17 18 19 19.1 19.2 19.3 Procedure . 16 Evaluation . 17 Test for protection against liquid splashes (for face-shields) 17 Apparatus . 17 Pro
17、cedure . 18 Evaluation . 18 Apparatus . I9 Procedure . 20 Evaluation . 20 Test for resistance to surface damage by fine particles . 20 Apparatus . 20 Falling sand apparatus 20 Sand 20 Measuring apparatus . 20 Samples 20 Procedure . 21 Evaluation . 21 Apparatus . 23 Samples 24 Procedure and evaluatio
18、n . 24 Head-form . 25 Test for protection against large dust particles . 17 Test for protection against gases and fine dust particles . 19 Reference samples 20 Test for resistance to fogging of oculars 23 Assessment of Field of Vision 28 Assessment of lateral protection . 29 Apparatus . 29 Procedure
19、 . 29 Evaluation . 29 Annex A (informative) Uncertainty of measurement and results interpretation . 30 A.l Annex ZA (informative) Clauses of this European Standard addressing essential requirements or other Test report and uncertainty of measurement . 30 provisions of EU Directives 32 3 EN 168:2001
20、(E) Foreword This European Standard 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 th
21、e latest by May 2002, and conflicting national standards shall be withdrawn at the latest by May 2002. This document replaces EN 168:1995. This European Standard has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential
22、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 CENKENELEC Internal Regulations, the national standards organizations of the following countries are bo
23、und 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. 4 EN 168:2001 (E) 1 Scope This European Standard specifies non-
24、optical test methods for eye-protectors, the requirements for which are contained 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 references This European S
25、tandard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text, and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications appl
26、y to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). EN 1 65, Personal eye-protection - Vocabulary. EN 1 66, Personal eye-protection - Specifications. EN 167, Person
27、al eye-protection - Optical test methods. IS0 565, Test sieves - Metal wire cloth, perforated metal plate and electroformed sheet - Nominal sizes of openings. 3 Test for increased robustness New specimens shall be used for this test. 3.1 Unmounted oculars 3.1 .I Apparatus The support for the ocular
28、(see Figure 1) shall be a steel or rigid plastic cylinder with an internal diameter of (35,O f 0,l) mm and an outside diameter of (41,O f 0,l) mm. The cylinder shall be inserted into, or be an integral part of a steel base. The ocular shall be cushioned by a silicone seating ring firmly attached to
29、the top of the tube. This seating ring shall be made of silicone rubber of (40 f 5) 1.R.H.D and shall have an inside diameter of (35,O f 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 f 5) g is placed on
30、 the ocular. The ring has an inside diameter the same as that of the support tube, and any convenient outside diameter. A silicone seating ring having the same dimensions and hardness as the one attached to the top of the support tube is placed between the load ring and the ocular. A piece of carbon
31、 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 to the concave and convex surfaces of the ocular respectively, and th
32、e dimensions of 3 mm and 43 mm shall apply to the 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 adaptor sleeves shall be used. 5 EN 168:2001 (E) 3.1.2 Procedure Centre the intende
33、d points of impact of the ocular on the support tube. Adjust the apparatus so that a 22 mm nominal diameter steel ball of 43 g minimum mass falling from ( 1,3$,3 ) m strikes the ocular within a 5 mm radius from the centre of the support tube. This height will provide an impact speed of approximately
34、 5,l m/s. Impacts shall be directed at the visual centre(s) of the oculars. For unmounted oculars covering one eye and for which the visual centre cannot be established, then the geometric centre shall be used. NOTE Visual centre is as defined in EN 166. The impacts are carried out in the following
35、conditions: a) with the ocular heated to (55 f 2) OC and maintained at this temperature for at least 1 h; b) with the ocular cooled to a temperature of (-5 f 2) OC and maintained at this temperature for at least 1 h New oculars shall be used for each individual impact and for each temperature condit
36、ion. The impact shall be applied within 30 s of temperature conditioning. The test shall be carried out at (23 f 5) OC. Dimensions in millimetres (nominal unless toleranced) 41 10,l 35 20.1 1 2 - Key 1 2 Silicone seating rings 3 Ocular 4 Load ring (250 f 5) g 5 Carbon paper on white paper Supporting
37、 plate (12 kg minimum) Figure 1 - Holding device for oculars for the increased robustness test 3.2 Complete eye-protectors and frames 3.2.1 Apparatus 3.2.1.1 Appropriate head-form, as defined in clause 17. 6 EN 168:2001 (E) A device enabling a 22 mm nominal diameter steel ball of 43 g minimum mass t
38、o be projected at a 3.2.1.2 specified point on the eye-protector at a speed of approximately 5,l m/s. 3.2.2 Procedure The eye-protector to be tested shall be placed on the appropriate head-form in the position corresponding to normal use. If the frame only is to be assessed then oculars meeting the
39、requirements of 3.1 (increased robustness) shall be fitted 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 o
40、f impact defined in 3.2.3. For spectacles with no lateral protection the ball shall strike the sidearm within the prescribed lateral protection area on 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 t
41、o (55 f 2) “C and maintained at this temperature for at least 1 h; b) with the eye-protector cooled to a temperature of (-5 f 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. The impact
42、 shall be applied within 30 s of temperature conditioning. The tests shall be conducted at an ambient temperature of (23 f 5) “C 3.2.3 Points of impact There 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 p
43、oints 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
44、 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 and parallel to its optical axis along each line o
45、f sight. For lateral impacts the head-form is rotated about its vertical axis by 90“ (left and right) from the frontal impact position. The head-form may be moved horizontally and vertically to select any single impact point lying within 1 O mm of the specified impact centres. As stated in 3.2.2, ne
46、w eye-protectors shall be used for each individual impact. 7 EN 168:2001 (E) 4 Test for minimum robustness of oculars with filtering effect and cover plates New specimens are used for this test. 4.1 Apparatus See Figure 2. 4.1.1 Loading device A steel ball of 22 mm nominal diameter is fastened to th
47、e 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 f 2) N. 4.1.2 Specimen support The support for the ocular (see Figure 2) shall be a steel cylinder with an internal diameter of (35,O f 0,l) mm and an outside diameter of
48、(41,O f 0,l) 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 f 5) I.R.H.D. having an inside diameter of (35,O f 0,4) mm and cross sections of 3 mm x 3 mm nominal dimensions. The silicone seating rin
49、gs are fixed 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 f 5) g. By its weight, it presses the upper silicone seating ring against the upper 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 of the 13 mm deep cavity. 4.2 Procedure 4.2.1 The test is carried out at (23 f 5) OC. 4.2.2 Align
