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ISO 4849-1981

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ISO 4849-1981

International Standard INTERNATIONAL ORGANIZATION FOR STANDARDIZATlON.MEXYHAPOHAR OPAHM3AlQlfl n0 CTAHAPTM3AL ,, E Not for ResaleForeword IS0 the International Organization for Standardization is a worldwide federation of national standards institutes IS0 member bodies. The work of developing Inter- national Standards is carried out through IS0 technical committees. Every member body interested in a subject for which a technical committee has been set up has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the IS0 Council. International Standard IS0 4849 was developed by Technical Committee ISO/TC 94, Personal safety - Protective clothing and equipment, and was circulated to the member bodies in July 1978. It has been approved by the member bodies of the following countries Australia Iran Austria Ireland Belgium Israel Czechoslovakia Italy France Mexico Germany, F. R. Netherlands Hungary New Zealand Poland Romania South Africa, Rep. of Spain Switzerland The member bodies of on technical grounds the following countries expressed disapproval of the document 0 Denmark United Kingdom USA USSR International Organization for Standardization, 1981 Printed in Switzerland ii Not for Resale--,,,--,,,,,,,---Contents 8 9 Introduction 1 Scope . 1 Field of application 1 References . 1 Numbering of filters . 1 Classification . 2 Design and manufacture . 2 Requirements 3 7.1 General requirements . 3 7.2 Particular requirements. . 5 Sampling 6 Identification . 6 . . . III Not for ResaleNot for ResaleINTERNATIONAL STANDARD IS0 4849-1981 E Personal eye-protectors - Specifications 0 Introduction This International Standard deals with general considerations relating to eye-protectors, such as - designation; - classification; - requirements applicable to,all eye-protectors; - some particular requirements; - sampling; - identification. The transmittance requirements and methods of test for eye- protectors for particular uses are given in the International Standards listed in clause 3. 1 Scope This International Standard specifies functional requirements for the various types of personal eye-protectors used mainly in industry. 2 Field of application This International Standard applies to all types of personal eye- protectors used against various hazards, particularly those en- countered in industry, which are likely to damage the eye or impair vision, with the exception of nuclear radiation, X-rays, laser beams and low-temperature infrared radiation. This International Standard is not applicable to sunglasses for general use or to “fashion” spectacles which are used princi- pally as a part of costume or of fancy dress. 1 Standard to be prepared by TC 172, Optics and optical instruments 2 At present at the stage of draft. Eye-protectors fitted with prescription lenses are not excluded from the field of application. The refractive power tolerances and other special characteristics dependant upon the prescrip- tion requirement will be the subject of a separate International Standard’. Until this International Standard is available, national standards may apply. 3 References IS0 4007, Personal eye-protectors - Vocabulary. IS0 4850, Personal eye-protectors for welding and related techniques - Filters - Utilisa tion and transmittance requirements. IS0 4851, Personal eye-protectors - Ultraviolet filters - Utilisa tion and transmittance requirements. IS0 4852, Personal eye-protectors - Infrared filters - Utilisa- tion and transmittance requirements. I SO 4853, Personal eye-protectors - Daylight filters - UtJisa- tion and transmittance requiremen ts.2 IS0 4854, Personal eye-protectors - Optical test methods. IS0 4855, Personal eye-protectors - Non-optical test methods. 4 Numbering of filters The transmittance characteristics of a filter are represented by a combination of two numbers separated by a dash - a code number; - the shade number of the filter. 1 Not for Resale--,,,--,,,,,,,---ISO.4849-1981 E The symbol for welding filters does not include a code number. Table 1 gives the numbering of the various types of filters specified in this International Standard. Table I - Numbering of filters Welding filters Ultraviolet filters Infrared Filters for filters daylight 1.7 I I 3 - 1.7 1 4 - 1.7 1 5 - 1.7 6 - 1.7 2 2.5 .3 4 5 6 7 3-2 3 - 2.5 3-3 3-4 3 -.5 4-2 4 - 2.a 4 - 2.5 4 - 2.5a 4-3 4-4 4 -5 4-6 i 1 / I2 1 / I I 14-7 I I 4- 10 5 -2 5 - 2.5 5 -3. 5-4 10 11 12 13 14 15 16 5 Classification 5.1 Types of eye-protector 5. I. I Spectacles, with’ or without side-shields see IS0 4007, sub-clause 3.5. 51.2 Goggles see IS0 4007, sub-clause 3.6. 51.3 Face-shield see IS0 4007, sub-clause 3.4. 5.1.4 Hand shield hand-held device which protects the eyes, face and neck. 5.1.5 Helmet device worn on the head, protecting the eyes, face, neck and part of the top of the cranium. I 5.2 Types of ocular 5.2.1 Mineral oculars 6.3 Headband 5.2.1 .I Untoughened mineral oculars. Headbands, when used, shall be of good quality, durable and at least 10 mm in width. 5.2.1.2 Toughened mineral oculars toughened chemically, thermally or by another process Mineral oculars which, as a result of the manufacturing process or subsequent treatment, possess mechanical resistance to impact superior to that of untoughened oculars and which, when broken, produce fragments which are less cutting than those of untoughened oculars. 5.2.2 Organic oculars plastics 5.2.3 Laminated oculars Oculars made in multiple layers joined together by a binder. NOTE - All these, types of ocular may have coatings on their surfaces to give,additional characteristics. 5.3 Function of eye-protectors The function of eye-protectors is to provide protection against - impacts of different severities; - optical radiations 0,l pm to 1 000 pm; - molten metal splashes; - liquid droplets and splashes; - dust; - gases; or any combination of these. 6 Design and manufacture 6.1 General construction Eye-protectors- shall be soundly constructed of appropriate materials and shall not have metallic coating or metallic parts except screws and hinges. Eye-protectors shall be free from ob- vious defects and shall meet the relevant performance re- quirements. . 6.2 Comfort for the wearer Eye-protectors shall be free from projections, sharp edges or other features which could cause discomfort. Furthermore, the materials used shall be so selected as to avoid any skin irritation and, in the case of anti-dust goggles, the construction shall allow for the’special risk of irritation. 2 Not for Resale--,,,--,,,,,,,---6.4 Fittings beam source. This optional method is described in annex A of IS0 4854. The measurements shall be taken Adjustable parts or components incorporated in eye-protectors shall be easily adjusted and replaced. 6.5 Ventilation a for r spherical effect and astigmatism Except where double-glazed or specially coated filters are used to reduce misting, appropriate ventilation shall be provided. - the at a minimum of four points one of which shall be centre in an area of 40 mm diameter around the geometrical centre of the ocular or at any point chosen 6.6 Thermal conductivity Except for spectacle frames, all materials which are likely to be exposed to radiation during use and which come into contact with the operator shall,have a thermal conductivity of less than 02 W-m-l.K-1 . 6.7 Composition of oculars by agreement between the manufacturer of the oculars and the manufacturer of the eye-protectors using these oculars. When the optical and geometrical centres are not identical, the examination shall be the subject of agreement between client and supplier. b for prismatic effect Oculars shall be made of plastics or other suitable synthetic materials, of toughened or laminated glass or any combination .of these materials. Untreated glass may be used only if it is backed with one of the foregoing materials, except in the case of oculars used solely against radiation, for example for welding and against sun-glare, or as cover oculars for the protection of filters. - at the geometrical centre of the ocular. The permissible tolerances are given in table 2. Table 2 - Permissible tolerances for unmounted oculars I I Spherical Grade effect Astigmatism Prismatic effect m-1 m-l m-1 7 Requirements 1 f 0,06 0,06 0,12 2 0,12 0,12 0,25 All eye-protectors shall meet the general requirements given in 7.1. Furthermore, according to their intended use, eye- protectors shall meet one or more of the particular re- quirements given in 7.2. 7.1.2.1.2 Mounted oculars 7.1 General requirements 7.1.1 Dimensions The optical defects of mounted oculars, spectacles or face- shields shall be measured in accordance with the method specified in sub-clause 3.2 of IS0 4854, eye-protectors being positioned on the standard support. Oculars shall have the following minimum dimensions Circular oculars diameter 40 mm Two other optional test methods are described in annexes B and C of IS0 4854. Spectacles 32 mm horizontal length x 25 mm vertical depth The permissible tolerances are given in table 3. One-piece lens goggles, face-shields 105 mm x 50 mm. Table 3 - Permissible tolerances for mounted oculars Eye-protectors shall ensure a sufficiently wide field of vision for it to be possible to do the work for which they are provided, without either risk or discomfort. Grade Spherical effect power in meridian of maximum error m-l Astig- ma- tism 7.1.2 Optical requirements m-1 Prismatic effect Horizontal Vertical base base out in cm/m cm/m cm/m 7.1.2.1 Refractive, astigmatic and prismatic powers 7.1.2.1.1 Unmounted oculars 1 2 f 0,06 AI 0,12 06 0,12 3 0,12 - 0,25 1 0,25* I l,oo 0,25 0,25 * Axes shall be parallel. The optical defects of unmounted oculars shall be measured by the method specified in sub-clause 3.1 of IS0 4854. These measurements may also be made by another method using, not the telescope, as in the reference method above, but a laser The specifications for prismatic effect correspond to the dif- ference betweenthe values at the specified measuring points of the eye-protector. 3 Not for Resale--,,,--,,,,,,,---IS0 48494981 E 7.1.2.2 Diffusion of light If an ocular diffuses light appreciably, the contrast may be reduced and the visual performances adversely affected. Con- sequently, diffusion characteristics should be specified, but in the present state of knowledge, it is not possible to specify limiting values. The scattered light shall be measured in accordance with the reference method involving small solid angles specified in sub- clause 4.2 of IS0 4854. Alternative methods for filters having a transmittance value t, in excess of 10 may be used, for ex- ample a hazemeter or visual inspection, provided that correla- tion has been established for the material under test. The limiting value of light diffusion which would be convenient appears to be 1,0 cd.m-2mIx-1 for welding filters and 0,5 cd-m-2*1x--1 for all other filters. 7.1.2.3 Colour recognition As far as possible, filters shall permit recognition of colours suf- ficient to the task and the observation of safety signs. Colour tint limits shall be established on the basis of experimental in- formation obtained on filters under actual use conditions and the chromatic adaptation of the human eye. 7.1.3 Quality of material and surface Except for a marginal area 5 mm wide, filters for eye-protectors shall be free from any significant defects likely to impair vision in use, such as bubbles, scratches, inclusions, dull spots, holes, mould marks, scoring or other defects originating from the manufacturing process. The test shall be carried out in ac- cordance with the method specified in clause 5 of IS0 4854 or by any other appropriate method of examination. 7.1.4 Robustness of construction This specification concerns mechanical hazards. The tests specified in 7.1.4.1 and 7.1.4.2 are not applicable to protectors against optical radiation, unless the filters are worn in areas of mechanical hazards. However, protectors against optical radia- tion shall also ensure a minimum resistance to mechanical risks. As such protectors are made according to different re- quirements and techniques in different countries, further studies are being conducted to develop a common specifica- tion and corresponding test method. 7.1 .4.1 Unmounted oculars oculars for hig h-mass, low-velocity flying objects protection against The oculars shall be designed to withstand the impact of a 22 mm diameter steel ball, of mass 44 g, dropped from a height 0 of 1,3 -0,03 m. The test shall be carried out in accordance specified in sub-clause 3. 1 of IS0 4855. with the method On so testing, there shall not be ocular fracture an ocular shall be considered to have fractured if it cracks through its entire thickness into two or more pieces, or if more than 5 mg of the ocular material becomes detached from the surface remote from that struck by the ball, or if the ball passes through the ocular. 7.1.4.2 Mounted oculars Mounted oculars shall meet the requirements of the robustness test which consists in withstanding the impact of a 22 mm diameter steel ball, of mass 44 g, dropped from a height of 0 1,3 - 0,03 m. The test shall be carried out in accordance with the reference method specified in sub-clause 3.2 of IS0 4855. On so testing, the following defects shall not occur a Ocular fracture an ocular shall be considered to have frac - the ultraviolet, infrared and visible transmittances shall remain within the limits of the shade to which the ocular belongs before the test see corresponding specifications in 7.2.1.1; - the amount of diffused light should not exceed the per- missible limit in 7.1.2.2 by more than 25 . 4 Not for Resale--,,,--,,,,,,,---IS0 48494981 E 7.1.7 Resistance to corrosion 7.2.1.1.5 Daylight filters After having undergone the test for resistance to corrosion specified in clause 7 of IS0 4855, all metal parts of an eye- protector shall display smooth surfaces free from oxidation when they are examined by the naked eye or, if necessary, with spectacles by a trained observer. See IS0 4853. 7.2.2 Complete eye-protectors 7.2.2.1 Ignition 7.1.8 Suitability for disinfection 7.2.2.1.1 Industrial protectors All parts of eye-protectors shall be capable of withstanding disinfection without visible damage, and cleaning, either by the method specified in clause 8 of IS0 4855, or in accordance with the manufacturer’s recommended method if this has been shown to be equally effective. Eye-protectors shall be tested in accordance with the method specified in sub-clause 6.1 of IS0 4855. The test pieces may be considered as sati

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