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Disclosure to Promote the Right To Information
Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.
इंटरनेट मानक
“!ान $ एक न' भारत का +नम-ण”Satyanarayan Gangaram Pitroda
“Invent a New India Using Knowledge”
“प0रा1 को छोड न' 5 तरफ”Jawaharlal Nehru
“Step Out From the Old to the New”
“जान1 का अ+धकार, जी1 का अ+धकार”Mazdoor Kisan Shakti Sangathan
“The Right to Information, The Right to Live”
“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता है”Bhartṛhari—Nītiśatakam
“Knowledge is such a treasure which cannot be stolen”
“Invent a New India Using Knowledge”
है”ह”ह
IS 5983 (1980): Eye-protectors [CHD 8: Occupational Safety,Health and Chemical Hazards]
AMENDMENT NO. 1 OCTOBER 2010 TO
IS 5983 : 1980 SPECIFICATION FOR EYE-PROTECTORS
(First Revision )
[Page 7, clause 3.1.1(a)] — Substitute 'Safety Goggles' for 'Goggles'.
(Page 11, clause 5.1.1.3, line 4) — Substitute 'cd/(m2.lx) for 'cd(m2.lx)'
(Page 13, clause 5.1.1.7) — Add the following new clause after 5.1.1.7:
'5.1.1.8 At the end of the text, the eye-protectors shall meet the following mechanical and optical requirements:
a) The amount of diffused light shall not exceed the permissible limit given in 5.1.1.3 by more than 25 percent.
b) The robustness of oculars made of synthetic material and laminated glass shall not have fallen below that specified in 5.1.1.6.
c) The ultra-violet, infra-red and visible transmittances shall remain within the limits to which the ocular belongs before the test (see 5.2.1.1).'
(Page 14, clause 5.1.2.4) — Delete.
(CHD 8)
IS : 5983 - 1980
Indian Standard SPECIFICATION FOR EYE-PROTECTORS
(First Revision )
Chairman
SIIRI K. D. SHARMA
Glassware Sectional Committee, CDC 10
Members
DR S. KUMAR (Alternate to Shri K. D. Sharma)
SHRI P. N. AGARWAL SHRI P. K. AGAR~AL (Alternate)
SHRI C. G. AMIN SHRI V. R. BHIDE SHRI D. S. CHABHAL
SHRI I. K. K~pud (Alternate) DR K. H. DAVE
SIXRI P. S. CHAVAN (dlternate)
Representing
Central Glass and Ceramic Research Institute (CSIR), Calcutta
Hindustan Safety Glass Works Ltd, Calcutta
Alembic Glass Industries Ltd, Vadodara Victorv Flask Co Pvt Ltd. Bombav Directorate General of Technical Development,
New Delhi
Haffkine Institute, Bombay
Ministry of Railways DEPUTY DIRECTOR STANDARDS (CAR- RIAGE)-II, RDSO, LUCKNOW
SARI S. K. GUPTA J. G. Glass Industries Pvt Ltd, Pune SARI A. B. KARANDIKAR (Alternate)
SHRI S. P. GUPTA Hindustan Pilkington Glass Works Ltd, Calcutta DR P. B. KAYAL Development Commissioner, Small Scale Industries,
New Delhi SIIRI K. K. SARAN AGGARWAL (Alternate)
SHRI C. K. MEHROTRA Export Inspection Council of India, Calcutta SHRI 0. P. DHAMIJA (Alternate)
SHRI H. C. PATEL Shree Vallabh Glass Works Ltd, Bombay SHRI WUSIRIKA RAMA RAO (Alternate)
DR A. V. R. RAO National Buildings Organization, New Delhi SHRI JOHAR SEN GUPTA (Alternate)
SIIRI J. R. SACHDEVA Ministry of Defence (DGI) DR S. P. SINGH DAAKARAY (Alternate)
SIIRI R. SAHAI Hindustan Vacuum Glass Ltd, Faridabad SHRI S. C. SHARMA (Alternate)
SHRI K. SHIMIZU The Indo-Asahi Glass Co Ltd, Calcutta SHRI S. B. PRASAD (Alternate)
( Continued on page 2 )
(0 Copyright 1981 INDIAN STANDARDS INSTITUTION
This publication is protected under the Indim Copyright Act (XIV of 1957) and reproduction in whole or in part by any means except with written permission of the publisher shall be deemed to be an infringement of copyright under the said Act.
ISI ‘(uraq3) JovaJ!a Bndaa 2Tj ‘V I=%
ISI ‘(uraq(l)) Jo$m!a hdaa LVMSWIVS 'd '3 I'aEIS
IS : 5983 - 1980
Indian Standard SPECIFICATION FOR EYE-PROTECTORS
(First Revision) 0. FOREWORD
0.1 This Indian Standard (First Revision) was adopted by the Indian Standards Institution on 30 November 1980, after the draft finalized by the Glassware Sectional Committee had been approved by the Chemical Division Council.
0.2 This standard was first published in 1971 under the title ‘Specification for protective filters for welding, cutting and similar operations’. How- ever, need was felt for revising the standard with a view to covering eye- protectors for other operations also thus making it comprehensive. Accordingly, the scope of this standard has now been enlarged to cover eye-protectors for use in operations where small particles flying at high velocity, molten metal, chemical splashes, dust, gases, optical radiations (ultra-violet, infra-red and glare from intense visible light) pose hazards which are likely to impair vision or damage the eye.
0.3 In this revision important aspects, such as designation of filters, classifi- cation of eye-protectors and oculars on the basis of their types, constructions and protection provided by them have been covered. General require- ments applicable to all eye-protectors and specific requirements applicable to eye-protectors ‘depending on the specific purpose for which they are used, have also been prescribed. Transmission requirements have been pres- cribed in respect of filters meant for use in flame-welding and braze-welding of heavy metals, welding with emitive fluxes, oxygen cutting, plasma jet thermal cutting, arc welding or arc gouging and direct arc welding in addition to those meant for protection against ultra-violet and infra-red radiations and intense daylight.
0.4 In the formulation of this standard due weightage has been given to international coordination among the standards and practices prevailing in different countries in addition to relating it to the practices in the field in this country. This has been met by deriving assistance from the following publications :
IS0 : 4849 Personal eye-protectors - Specifications.
IS0 : 4850 Personal eye-protectors for welding and related techniques - Filters - Utilization and transmittance requirement.
IS0 : 485 1 Personal eye-protectors - Ultra-violet filters - Utilization and transmittance requirements.
3
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IS : 5983 - 1980
is expressed in terms of chromaticity coordinates x, y and z, the sum of which is unity. The coordinate x’ is analogous to the proportion of red, y to the proportion of green and z to the proportion of blue.
2.5 Cover-all Goggles - A4n eye-protector designed to fit over vision correcting spectacles.
2.6 Dioptre -- The unit of refractive power (1 dioptre= 1 m-l).
2.7 Double Glazed Lens - Lens consisting of two or more components separated by an air gap and with the normal line of sight passing through all the components.
2.8 Dust-Proof Goggles - Goggles designed to restrict ingress of dust into the orbital areas enclosed by the goggles.
2.9 Eye-Cup Goggles - An eye-protector consisting of two lenses mounted in cups supported by a flexible nose bridge and head band.
2.10 Eye-Protector - Any form of equipment which includes a lens or lenses, worn in front of the eyes to provide protection for the eyes.
2.11 Eye-Shield-A transparent visor supported in front of the face to shield the eyes.
2.12 Face-Shield - A device including a transparent visor, supported in front of the face to shield the eyes, face, forehead and front of neck.
2.13 Filter-An ocular designed to reduce intensity of incident harmful radiations by absorbing and/or reflecting them. It may be plastics, solid glass, laminated construction or other suitable material.
2.14 Filter Cover - A transparent cover used to protect the filter(s) against abrasion and weld spatter. It may be of plastics or any other suitable material.
2.15 Gas-Tight Goggles - Goggles designed to prevent ingress of harmful gases and fumes into the orbital areas enclosed by the goggles.
2.16 Goggles -An eye-protector which fits the contour of the face to enclose the optical area and is held in position by a head band.
2.17 Hood-A device covering the head and neck which includes eye protection.
2.18 Impact Protector - An eye-protector able to provide safety against impact of particles flying at high velocity.
2.19 Luminous Transmittance -. The ratio of the transmitted luminous flux to that of the incident luminous flux. In order to calculate this, the spectral luminous efficiency V (A) must be introduced.
5
IS : 5983 - 1980
780 nm 4be h T (4 V (4 d A
l-v = 380 nm
I
780 nm +, x v (4 d h
380 nm
2.20 Meniscus - An ocular having two spherical surfaces of which one is convex an&the other concave.
2.21 Molten Metal Protector - An eye-protector able to provide safety against Hying molten metals or hot solids.
2.22 Ocular (or Lens) - That part of an eye-protector through which an operator sees.
2.23 Prismatic Power - The apparent angular displacement of an object by an optical system. It is expressed in ‘prism dioptres’.
NOTE - A prismatic effect can be produced by prismatic power in the ocular by the position of the ocular relative to its correct visual axis or by a combination of these.
2.24 Refractive Power - The reciprocal of the back focal length of an optical system. It is expressed in ‘dioptres’.
2.25 Safety Clip-ons - A pair of protective lenses designed to clip-on over the front of non-safety spectacles.
2.26 Safety Spectacles-An eye-protector the oculars of which are mounted in spectacle type frame, with,or without side-shield.
2.27 Shade Number - Defined by the expression :
.N= 1+ ilogl0. f V
where Jv = shade number, and TV = luminous transmittance (see 2.19).
2.28 Spectral Transmittance-The ratio of the transmitted spectral radiant flux to that of the incident spectral radiant flux.
I(h) =&-
2.29 Transmittance in I&-a-Red Spectrum
a) For welding filters and IR filters, transmittance requirements are given for two wavelength ranges:
Near infra-red -from 780 to 1 300 nm Mid infra-red - from 1 300 to 2 000 nm
6
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0861- C86S : SI
IS : 5983 - 1980
3.1.2 Oculars - Oculars shall be of the following types: /
a) Mineral Oculars - made of glass. These shall be toughened thermally, chemically or by any other process. (Oculars which have been toughened are also called ‘treated’ oculars.),
b) Organic Oculars - made of plastic material, and
c) Laminated Oculars - comprising multiple layers joined together by a binder.
NOTE -Untreated glass may also be used for oculars provided it is backed with either treated glass or plastics cover.
3.1.2.1 -411 these types of oculars may have coatings on their surface(s) to give additional transmittance characteristics.
3.2 Designation of Filters - Filters shall be designated for their trans- mittance characteristics by a combination of two numbers, namely, a code number and the shade number of the filter, separated by a hyphen. The designation of welding filters, however, shall not include a code number. For example, a filter meant for protection against ultra-violet radiation having code number 2 and shade number 1.2, shall be designated as 2-1.2 (see Table 1).
NOTE - Filters for low temperature infra-red sources are not covered in this standard.
3.2.1 The designations of the various types of filters shall be as specified in Table 1.
4. DESIGN AND MANUFACTURE OF EYEPROTECTORS
4.0 General - Eye-protectors shall be constructed of appropriate materials, shall be free from visual defects and shall also meet relevant performance requirements.
4.1 Comfort to the Wearer - Eye-protectors shall be free from projec- tions, sharp edges or other features which could cause discomfort. The materials of construction shall be so selected as would avoid skin irritation. In the case of dust-proof goggles, the construction shall allow minimum risk of irritation.
4.2 Head-band-Head-bands, when used, shall be of good quality, durable and at least 10 mm in width.
4.3 Fittings -Adjustable parts or components incorporated in eye- protectors shall be easily adjusted and replaced.
4.4 Ventilation - Except where double-glazed or specially coated filters are used, ventilation shall be provided and adopted to reduce misting.
4.5 Thermal Conductivity - Except for spectacles, all materials which are likely to be exposed to radiation during use and which come in contact with the operator shall have a thermal conductivity of less than 0.2 W.m-‘K-1.
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IS : 5983 - 1980
5.1 General Requirements
5.1.1 Oculars
5.1.1.1 Dimensions - Oculars shall comply with the following dimen- sional requirements:
a> b)
cl
4
e)
Eye-cup goggles - Each ocular shall have a datum length (see Fig. 1) of not less than 50 mm. Safety spectacles - Each ocular shall have a datum length of not less than 42 mm and a mid-datum depth of not less than 32 mm (see Fig. 1). Safeety clip-ons - Each ocular shall have a datum length of not less than 42 mm and a mid-datum depth of not less than 32 mm [see Fig. 1). Eye shields - The transparent visor of a half-face type of eye shield shall be not less than 100 mm in depth. Single-frame coverall goggles - Oculars of coverall goggles fitted in pairs shall have a datum length of not less than 50 mm (see Fig. 1).
DD - Datum Line AA’ - Datum Length of Lens M BB’
- Datum Centre (Mid-Point of AA’) - Mid-Datum Depth of Lens (Measured Through M)
FIG. 1 DIMENSIONS OF OCULARS
5.1.1.2 Optical requirements- In order to affect vision as little as possible, the prismatic and spherical effects and astigmatism shall be as smal1 as possible.
10
IS : 5983 - 1980
a) Unmounted oculars - Optical requirements of unmounted oculars shall be measured by the method given in 3.1 of IS : 7524 (Part II)-1980*. The permissible tolerances shall be as given in Table 2. All measurements shall be taken for:
i) Spherical e&t and astigmatism - at a minimum of four points in an area of 40 mm diameter around the geometrical centre of the ocular. One of the four points shall be the geometrical centre of the ocular and other points may be chosen by agreement between the manu- facturer of the oculars and the manufacturer of the eye-protectors using these oculars; and
ii) Prismatic e$ect - at the geometrical centre of the ocular.
TABLE 2 PERMISSIBLE TOLERANCES FOR SPHERICAL EFFECT, ASTIGMATISM AND PRISMATIC EFFECT FOR UNMOUNTED
OCULARS
[Clause 5.1.1.2(a)]
TYPE OF OCULARS
SPHERICAL EFFECT,
In-1
(2)
ASTIGBIATISM, PRIWATIC EFFECT,
m-1 cm,lm
a) ho.06 0.06 0.12
b) kO.12 0.12 0*25
b) Mounted oculars - Optical requirements of mounted oculars and spectacles shall be measured in accordance with one of the methods given in 3.2 of IS : 7524 (Part II)-1980”; eye-protectors being positioned on the standard support after being subjected to the test for stability at elevated temperature (see 5.1.2.1). Either of the two methods A or B, by measure- ment or tolerance, may be used. The permissible tolerances shall be as ~~~li;~able 3. All measurements shall be taken as given in (a) and (b)
. . . .
5.1.1.3 Dzjiuion qf Zig/zt - If an ocular diffuses light appreciably, the contrast may be reduced and visual performances adversely affected. Accordingly for the purpose of this standard, the limiting value of light diffusion may be I.0 cd (m2.1x) for welding filters and 0.5 cd/(ms. lx) for all other filters. The scattered light shall be measured in accordance with the method given in 4 of IS : 7524 (Part II)-1980”.
5.1.1.4 Colour recognition -. Oculars with filtering action, as far as possible shall permit recognition of colours sufficient to the task and the observation
*Methods of test for eye-protectors: Part II Optical tests (jkst revision).
11
IS : 5983 - 1980
TABLE 3 PERMISSIBLE TOLERANCES FOR SPHERICAL EFFECT, ASTIGMATISM AND PRISMATIC EFFECT FOR MOUNTED OCULARS
[Clatm 5.1.1.2(b)]
TYPE OF SPHERICAL EFFECT OCULAR
d,‘RSZ”aF hfAXIMUM ERROR)
(1) ;,’
a) 10.06
b) &0.12
c) “8::;
*Axes must be parallel.
ASTIGMATISM
;p37’
0.06
0.12
0.25*
PRISMATIC EFFECT ~~L___--_~
Horizontal Vertical
’ Base out Basein ' CIll/IIl cm/m (4) (5)
cm/m (6)
1.00 0.25 0.25
1.00 0.25 0.25
1.00 0.25 0.25
of safety signs. Colour tint limits shall be established on the basis of ex- perimental information obtained on filters under actual use conditions and the chromatic adaptation of the human eye.
5.1.1.5 Quality of material and surface - Except for a marginal area 5 mm wide, oculars for eye-protectors shall be free from any significant defects likely to impair vision in use, such as bubbles, scratches, inclusions, dulI spots, holes, mould marks, scoring or other defects originating from the manufacturing process. The test shall be carried out in accordance with the method given in 5 of IS : 7524 (Part II)-1980”.
5.1.1-6 Robustness of construction - Oculars for protection against hazards other than mechanical hazards are exempted from the robustness test. For oculars for protection against radiation, dust and chemicals this test is not required unless the ocular is a combined filter and mechanica safety ocular.
NOTE -When filters for protection against radiation, dust and chemicals are worn in areas of mechanical hazards, an assembly combining such filters with mounted oculars meeting the mechanical hazards specifications should be worn.
a) Unmounted oculars - For protection against high-mass low-ve!ocity flying objects the oculars shall be designed to withstand the impact of a 22 mm diameter steel bal!, of about 44 g mass, dropped from a height of 1.27 to 1.30 m. The test shall be carried out in accordance with the method given in 4.1 of IS : 7524 (Part I)-19807. On testing, there shall be no ocular fracture. An ocular shall be considered as having fractured if it cracks
*Methods of test for eye-protectors: Part II Optical tests (&t revision). tMethods of test for eye-protectors: Part I Non-optical tests (&t r&ion).
12
IS : 5983 - 1980
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.
b) Mounted oculars -- Mounted oculars shall withstand the impact of a 22 mm diameter steel ball, of about 44 g mass, dropped from a height of I.27 to 1.30 m. The test shall be carried out in accordance with the method given in 4.2 of IS : 7524 (Part I)-1980*. On so testing, the following defects shall not occur:
9
ii)
iii)
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;
Ocular deformation - an ocular shall be considered to have deformed if a mark appears on the white paper on the side opposite to that struck by the ball; and
Ocular housing or frame failure - an ocular housing or frame shalI be considered to have failed if it separates into several parts, if it is no longer capable of holding an ocular in position ; or if an un- broken ocular separates from the frame.
5.1.1.7 Stability in presence of ultra-violet radiation - The oculars shall be subjected to the test by exposing them for 100 h to radiation from a quartz- envelop high pressure xenon lamp of 450 W at a distance of 300 mm, incident radiation being substantially normal to the surface of the ocular.
NOTE - It is permissible, for routine testing, to reduce the time of exposure and the distance to the ocular, for example, to 50 h at 200 mm.
5.1.2 Eye-Prottktor Assembly - Eye-protectors shall ensure a sufficiently wide field of vision to make it possible to do the work for which they are provided, without discomfort or risk.
NOTE -For eye-cup type protectors the minimum temporal and downward fields of vision shall be 50” and 60’ respectively. For wide-vision protectors these values shall be at least 60” and 67” respectively.
5.1.2.1 Stability at elevated temperature - The assembled eye-protectors shall be stable at elevated temperature (55&,2”C), and, when tested in accordance with the method given in 3 of IS : 7524 (Part I)-1980*, shall show no apparent deformation. At the end of the test, the optical qualities shall not have deteriorated beyond the limits laid down in 5.1.1.2.
5.1.2.2 Resistance to corrosion - 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, after the eye-protector has undergone that test for resistance to corrosion in accordance with the method given in 6 of IS : 7524 (Part I)-1980”.
*Methods of test for eye-protectors: Part I Non-optical tests (j%~t revision).
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0861- E86S : SI
IS : 5983 - 1980
5.2.2.4 Protection against chemical splashes - Eye-protectors intended for protection against chemical splashes shall be considered satisfactory if no coloration appears in the area enclosed by the eye-protector, when they are tested in accordance with the method prescribed in 12 of IS : 7524 (Part I)-1980*.
NOTE - ‘Creeping’ of red colour immediately at the edges shall be ignored provided the coloration does not develop for a distance greater than 6 mm within the area en- closed by the eye-protector.
5.2.2.5 Protection against dust - Eye-protectors intended for protection against dust shall be considered as satisfactory if the reflectance after the test is not less than 80 percent of its value before testing, when they are tested in accordance with the method prescribed in 13 of IS : 7524 (Part I)- 1980*.
5.2.2.6 Protection against gases and vapours - Eye-protector intended for protection against gases and vapours shall be considered as satisfactory if no staining appears in the area enclosed by the eye-protector when it is tested in accordance with the method prescribed in 14 of IS : 7524 (Part I)- 1980”.
NOTE 1 - No account shall be taken of any darkening in the immediate vicinity of the edges, provided that it does not develop further than 6 mm within the area enclosed by the eye-protector.
NOTE 2 .- As eye-pro ectors intended for protection against chemicals, dust and gas are tested for resistance to penetration on a standard head-form, greatest care should be taken to ensure a proper fit of the individual piece.
6. TESTS
6.1 Oculars - Oculars of eye-protectors shall be subjected to appropriate tests listed in Table 4 and in the sequence described therein.
6.1.1 The tests shall be conducted on not less than 10 oculars of each type, or 5 pairs of each type of oculars, and each ocular shall satisfy the requirements of the relevant tests.
6.2 Eye-Protector Assembly -. Eye-protectors shall be subjected to appropriate tests listed in Table 5, and in sequence described therein.
6.2.1 The tests shall be conducted on not less than 5 assembled eye- protectors ofeach design or model and each protector shall satisfy the require- ments of the relevant tests.
7. MARRING AND PACKING
7.1 Marking - Oculars and eye-protector frames shall be marked as given in Table 6.
*Methods of test for eye-protectors: Part I Non-optical tests (Jirst revision).
16
IS : 5983.1980
TABLE 4 SCHEDULE OF TESTS FOR OCULARS (muse 6.1)
SL TEST OCULARS No. r___--- ----
General Purpose High Filtering (with Mechanical Velocity Actions
Hazard) Impact
(1) (2) (3) (4) (5)
i) Optical X X :<
ii) Robustness :< - :i
iii) Stability >: X x
iv) Transmittance : a) Non-filtering x X :-:
b) Filtering - - X
v) High velocity impact - X -
vi) Molten metal and hot solids - 0 o
x = mandatory 0 = optional
REF TO
CLAUSE
(6)
5.1.1.2
5.1.1.6
5.1.1.7
5.2.1.1(a)
5.2.1.1(b)
5.2.2.2
5.2.2.3
7.1.1 Eye-protectors made for protection against combination of hazards such as highly velocity impact and/or molten metal with splashes, dust or gas, shall be marked on the oculars as for high velocity impact and/or molten metal and on the frames as for high velocity impact and/or molten metal and letter ‘S’, ‘D’ or ‘G’ as appropriate (see Table 6).
NOTE - Glass oculars supplied for use in high velocity impact and/or molten metal eye-protectors in combination with plastics lenses shall be additionally marked with the word ‘outer’ on the plastics layer.
7.12 Replacement glass lenses for use in high velocity impact eye- protectors shall have affixed to them labels stating that they shall be backed by plastics lenses.
7.1.3 Eye-protectors shall also be marked with the IS1 Certification Mark.
NOTE - The use of the IS1 Certification Mark is governed by the provisions of the Indian Standards Institution (Certification Marks) Act and the Rules and Regulations made thereunder. The 1SI Mark on products covered by an Indian Standard conveys the assurance that they have been produced to comply with the requirements of that standard under a well-defined system of inspection, testing and quality control which is devised and supervised by IS1 and operated by the producer. IS1 marked products are also continuously checked by IS1 for conformity to that standard as a further safe- guard. Details of conditions under which a licence for the use of the IS1 Certification Mark may be granted to manufacturers or processors, may be obtained from the Indian Standards Institution.
17
TABLE 5 SCHEDULlji OF TESTS FOR EYE-PROTECTORS (Clause 6.2)
USE OF EYE- OPTI- Row- HEAT CORRO- DISIN- TRANS- FLAF.IE HIGII MOLTEN Cmwc- DUST G.4S PROTECTOR CAL STNRSS STARI- SION FEC- MITTANCR RESIS- VELO- 5.2.2.5 AND
5.1.1.2 5.1.1.6 LITY 5.1.2.2 TION rA -7 TANCE 5.1.2.1 5.1.2.3 5.2.1.1
(4
(7)
X
?:
x
:<
X
x
-
_.I \
5.2.2.1 5.2.1.1
(b)
CITY IhlPACT
5.2.2.2
(1)
General purpose
High velocity impact
E Molten metal and hot solids
(2) (3)
x x
x -
X 0
X 0
X X
X 0
X 0
:< 0
(4) (5) @I
:< :/ x
:< :< x
x x ?:
:< s :<
X X X
X X X
X X X
:< X \, \
(8)
-
x
-
-
0
X
0
(9)
X
x
x
.Y
x
X
x
:.:
(10)
-
x
-
-
-
-
o
0
METAL AL
AN0 SPLASII-
HOT SOLIDS 5.2.2.3
(11)
-
5.2EI.4
(12)
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-
Y
-
-
-
0
VAP- OURS
5.2.2.6
(13)
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-
-
-
?<
-
_
0
(14)
-
-
-
-
-
X
-
0
Splashes
Dust
Gases and vapours
Filtering action
Combination as above
>: = mandatory 0 :-= optional
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0861- E86S : SI
IS : 5983 - 1980
APPENDIX B
(Clause 5.2.1.1)
TRANSMITTANCE AND CHROMATICITY LIMITS OF FILTERS AND GUIDANCE ON THEIR SELECTION AND USE
B-O. GENERAL
B-0.1 Transmittance requirements and limits of chromaticity have been prescribed for filters for protection against harmful radiations. Information useful in the selection and use of such filters has also been provided.
B-l. WELDING FILTERS
B-l.1 Transmittance - Transmittance requirements for filters used in welding shall be as given in Table 8.
B-1.1.1 In addition, the filters shall also comply with the requirements given below:
Range of Wavelength, nm Permissible Transmittance
From 210 to 313 Not to exceed the value specified for 3 13 nm From 313 to 365 Not to exceed the value specified for 365 nm From 365 to 400 The mean spectral transmittance not to
exceed the mean luminous transmittance TV
NOTE 1 - Luminous transmittance values are based on the spectral distribution of illuminant A of the CIE.
NOTE 2 -Minimum and maximum values of luminous transmittance may be ex- ceeded by taking into account the limits of relative uncertainty given in Table 2 of IS : 7524 (Part II)-1980*.
NOTE 3 - The infra-red transmittance values are determined by integration of spectral transmittance in the infra-red range.
B-1.1.2 Sfiecial Filters for Flame- Welding with a Flux - When a flux is used in flame-welding, the light emitted by the source is often very rich in mono- chromatic light of one or more wavelengths, which makes it very difficult to follow the work properly; for example, light from sodium and lithium which is rich in radiations ofwavelengths 589 nm and 671 nm respectively.
B-1.1.2.1 It is recommended that filters or combination of filters, with a selective absorption for 589 nm and 671 nm lines be used in order to eliminate the inconvenience caused by the intense emission of mono- chromatic radiation.
*Methods of test for eye-protectors: Part II Optical tests (jrst revision).
21
w
DESIGNATION OF WELDING
FILTERS
(1)
9 ii)
iii)
iv)
v)
vi)
vii)
viii)
ix)
x)
xi)
Xii)
xiii)
xiv)
XV)
xvi)
xvii)
xviii)
xix)
(2)
1.2 1.4 1.7 2.0 2.5 3 4 5 6
8 9
IO
11
I”
13
1+
15
16
[Cln&B-I.1 a&B-1.3(b)]
TRANSMITTANCE IN THE ULTRA-VIOLET (UV)
SPECTRUM, T (h) r_---_--__
At 313 nm At 365 nm percent, A&w percent, Mns
LUMINOUS TRANSMITTANCE (TV)
_---~-h-_~_~ Percent. Percent,
Max Mitt
(3) (4)
0~000 3
0,000 3
0~000 3
0.000 3
0.000 3
0.000 3
o*ooo 3
0.000 3
0.000 3
0.000 3
0.000 3
0~000 3
0.000 3
Value less than
or equal to
transmittance
ractor for
365 nm
50 100 74,4 35 74.4 58.1
22 58.1 43.2 14 43.2 29.1 6.4 29.1 17.8
2.8 17.8 8.5 0.95 8.5 3.2 0.30 3.2 1.2 0.10 1.2 0.44 0.037 0.44 0.16 0.013 0.16 0,061 o,oo+ 5 0.061 0.023 0.001 6 0.023 0.008 5 0.000 GO 0.008 5 0,003 2 0.030 20 0.003 2 0.001 2 0~090 076 0.001 2 0.000 44 0.000 027 0.000 44 _ 0.000 16 o*ooo 009 4 0.000 16 0.000 061 0.000 003 4 0~000 061 0.000 023
(5)
TABLE 8 TRANSMITTANCE REQUIREMENTS FOR FILTERS USED IN WELDING . .
8 MEAN TRANSMITTANCE IN THE 8 INFRA-RED (IR) SPECTRUM ’
_-w---_-_-h--.----~ Near (IR), TNtR Mid (IR), TX,,, g 1 300 to 780 nm 2 000 to a
perceni, Mnx 1 300 *ml
percent, Max
(7) (8)
37 37
33 33
26 26
21 13
15 9.6
12 7.5
6.4 5.4
3.2 3.2
1.7 1.9
0.81 1.2
0.43 0.68
0.20 0.39
0.10 0.25
0.050 0.15
0.027 0.096
0.014 0 OGO
0.007 0.04
0.003 0.02
0.003 0.02
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TABLE 12 DESIGNATIONS OF FILTERS FOR ELECTRIC ARC-WELDING OR ARC-GOUGING (Clauses B-1.2.0.3 and B-1.2.4)
USE
Current in Amperes and Designations
10 15 20 30 40 GO 80 100 125 150 1 I I I
5 200 225 250 275 300 350 400 450 500
Covered elcc- u-odes (shielded metal arc)
hiIG on heavy metals*
MIG on light alloys
TIG on all metals and alloys
MAG [ 10 1 11 / 12
‘Arc-air’ gouging
10 -2
I -
12 I 13 14
12 I 13 14 15
13 14
13 I 14
I 15
11 1 12
I 13 14
I 15
*The expression ‘heavy metals’ applies to steels, alloy steels, copper and its alloys, etc. NOTE 1 - Next higher or lower designation may be used, according to the conditions of use.
NOTE 2 - The symbol: MIG - corresponds to the use of an arc operated by an inert gas: with an axial spray metal transfer; TIG - corresponds to the use of a tungsten electrode arc protected by an inert gas; MAG -- corresponds to the use of an arc protected by carbon dioxide either pure or in mixture, and electrode
arc protected by an inert gas; and Arc-air - corresponds to the use of a carbon electrode and a compressed air jet urcd in gouging in order to
remove the molten metal.
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0861- E86E : SI
IS : 5983 - 1980
TABLE 15 SELECTION OF FILTERS FOR PROTECTION AGAINST TJLTRA- VIOLET RADIATION
(Clause B-2.2)
DESIGNATION OF FILTERS
PROPERTIES TYPICAL APPLICATIONS
2-1.2
Z-1.4
3-1.2 3-1.4 3-1.7
3-?.O 3-2.j
3-3 3-4
3-5
Filters may change colour per- For use when total absorption of ception. Appearance: very pale ultra-violet radiation is required yellow
Filters may change colour per- For use when some absorption of ception. Appearance: pale visible light is required in addition yellow to total absorption of ultra-violet
radiation
ho substantial modification of For use with sources which produce colour perception predominantly ultra-violet radia-
tion when glare is not an im- portant factor. The lightest shades are effective in photographic re- production work
No substantial modification of For use with sources which produce colour perception both ultra-violet radiation and
visible light to a high degree (for example, in ultra-violet ray therapy particularly medical treatment)
No substantial modification of For use with high pressure mercury colour perception vapour lamps and ultra-violet
source (for example, ultra-violet ray treatment, especially when carried out by the patients them- selves)
No substantial modification of For use u-ith ultra-violet sources colour perception which also emit a high proportion
of visible light (for example, very high pressure mercury vapour lamps used in laboratories and medical treatment)
29
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