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AS/NZS 1337:1992

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Eye protectors for industrial applications

Available format(s): Hardcopy, PDF 1 User, PDF 3 Users, PDF 5 Users, PDF 9 Users

Superseded date: 25-06-2021

Language(s):

Published date: 31-12-1991

Publisher: Standards Australia

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Table of Contents - (Show below) - (Hide below)

1 - AS/NZS 1337:1992 EYE PROTECTORS FOR INDUSTRIAL APPLICATIONS
4 - PREFACE
5 - CONTENTS
6 - SECTION 1 SCOPE AND GENERAL
6 - 1.1 SCOPE
6 - 1.2 APPLICATION
6 - 1.3 REFERENCED DOCUMENTS
6 - 1.4 DEFINITIONS
6 - 1.4.1 Browguard
6 - 1.4.2 Cover lens
6 - 1.4.3 Double-glazed lenses
6 - 1.4.4 Eye protector
6 - 1.4.5 Eyeshield
6 - 1.4.6 Faceshield
6 - 1.4.7 Filter
6 - 1.4.8 Goggles
7 - 1.4.9 Headform
7 - 1.4.10 Hood
7 - 1.4.11 Laminated lenses
7 - 1.4.12 Lens
7 - 1.4.13 Luminous transmittance
7 - 1.4.14 Prismatic power
7 - 1.4.15 Refractive power
7 - 1.4.16 Safety clip-ons
7 - 1.4.17 Safety spectacles
7 - 1.4.18 Side shield
7 - 1.4.19 Solar erythemal ultraviolet
7 - 1.4.20 Solar near-ultraviolet
7 - 1.4.21 Tempering
7 - 1.4.22 Tinted lens types
7 - 1.4.23 Untinted lens
7 - 1.4.24 Visor
7 - 1.4.25 Welding handshield
7 - 1.4.26 Welding helmet
7 - 1.4.27 Wide-vision spectacles
7 - 1.4.28 Wire-mesh screen„
9 - SECTION 2 REQUIREMENTS FOR LENSES
9 - 2.1 SCOPE OF SECTION
9 - 2.2 GENERAL REQUIREMENTS FOR LENSES
9 - 2.2.1 Finish
9 - 2.2.2 Materials
9 - 2.2.3 Dimensions of lenses (see Figure 2.1)
9 - 2.3 MATERIAL REQUIREMENTS
9 - 2.3.1 Visual quality
9 - 2.3.2 Viewing area
10 - 2.4 OPTICAL PROPERTIES OF LENSES
10 - 2.4.1 Position of measurement
10 - 2.4.2 Direction of measurement
11 - 2.4.3 Refractive power of lenses
12 - 2.4.4 Prismatic power of lenses
12 - 2.4.5 Transmittance properties of lenses
12 - 2.4.6 Fluorescence
12 - 2.5 LOW IMPACT RESISTANCE
12 - 2.5.1 General
12 - 2.5.2 Performance criteria
12 - 2.6 MEDIUM IMPACT RESISTANCE
12 - 2.6.1 General
12 - 2.6.2 Performance criteria
12 - 2.7 HIGH IMPACT RESISTANCE
12 - 2.7.1 General
13 - 2.7.2 Performance criteria
13 - 2.8 PENETRATION RESISTANCE
13 - 2.8.1 General
13 - 2.8.2 Performance criteria
13 - 2.9 FLAME PROPAGATION
13 - 2.9.1 General
13 - 2.9.2 Performance criteria
13 - 2.10 SPECIAL REQUIREMENTS
13 - 2.10.1 Protection against molten metals
13 - 2.10.2 Protection against hot solids
13 - 2.11 TESTING
13 - 2.12 MARKING OF LENSES AND REPLACEMENT LENS PACKAGING
13 - 2.12.1 Marking of lenses
13 - 2.12.2 Marking of replacement lens packaging
15 - SECTION 3 REQUIREMENTS FOR ASSEMBLED EYE PROTECTORS
15 - 3.1 SCOPE OF SECTION
15 - 3.2 GENERAL REQUIREMENTS
15 - 3.2.1 Finish
15 - 3.2.2 Materials
15 - 3.2.3 Optical properties of lenses
15 - 3.2.4 Ventilation
15 - 3.2.5 Dimensional requirements for eyeshields and faceshields
15 - 3.2.6 Impact resistance
15 - 3.2.7 Penetration resistance
16 - 3.2.8 Flame propagation
16 - 3.2.9 Thermal stability
16 - 3.2.10 Protection against corrosion
16 - 3.3 SPECIAL PERFORMANCE REQUIREMENTS
16 - 3.3.1 Medium impact protectors
16 - 3.3.2 High impact protectors
17 - 3.3.3 Protection against splashes
17 - 3.3.4 Protection against dust
17 - 3.3.5 Protection against gas
17 - 3.3.6 Protection against molten metal and hot solids
17 - 3.4 TESTING
17 - 3.5 MARKING OF ASSEMBLED EYE PROTECTORS AND PACKAGING
17 - 3.5.1 Eye protectors
18 - 3.5.2 Packaging
19 - SECTION 4 ADDITIONAL REQUIREMENTS FOR ASSEMBLED EYE PROTECTORS FOR WELDING AND ALLIED OPERATIONS
19 - 4.1 SCOPE OF SECTION
19 - 4.2 DESIGN AND CONSTRUCTION
19 - 4.2.1 General
19 - 4.2.2 Materials and finish
19 - 4.2.3 Safety spectacles
19 - 4.2.4 Goggles
19 - 4.2.5 Filter and filter cover mounting
19 - 4.2.6 Ventilation
19 - 4.2.7 Headband
19 - 4.2.8 Filters and cover lenses
19 - 4.3 DESIGN AND CONSTRUCTION OF HELMETS AND HANDSHIELDS
19 - 4.3.1 General
19 - 4.3.2 Design
19 - 4.3.3 Protection against heat and electric shock
19 - 4.3.4 Helmets
20 - 4.3.5 Handshields
20 - 4.3.6 Mounting of filters and filter covers
20 - 4.3.7 Assembled helmets and handshields
20 - 4.3.8 Impact resistance
20 - 4.3.9 Cover and clear lenses
20 - 4.4 PHYSICAL REQUIREMENTS
20 - 4.4.1 Flame propagation
20 - 4.4.2 Protection against hot solids
20 - 4.5 TESTING
20 - 4.6 MARKING OF ASSEMBLED EYE PROTECTORS
21 - APPENDIX A - METHOD FOR THE DETERMINATION OF SPECTRAL TRANSMITTANCE
21 - A1 SCOPE
21 - A2 PRINCIPLE
21 - A3 APPARATUS
21 - A4 SCALE CALIBRATION OF SPECTROPHOTOMETER
21 - A5 USE OF SPECTROPHOTOMETER
21 - A6 PROCEDURE
21 - A6.1 General
21 - A6.2 Uniformly tinted lenses (non-polarizing)
21 - A6.3 Uniformly tinted lenses (polarizing)
21 - A6.4 Gradient density lenses (non-polarizing)
22 - A6.5 Gradient density lenses (polarizing)
22 - A6.6 Photochromic lenses
22 - A7 CALCULATION OF LUMINOUS TRANSMITTANCE AND COLORATION FACTORS
22 - A7.1 Luminous transmittance
22 - A7.2 Mean transmittance values for ultraviolet
22 - A7.3 Coloration factors
23 - A8 TEST REPORT
24 - APPENDIX B - METHOD FOR THE DETERMINATION OF FLUORESCENCE
24 - B1 SCOPE
24 - B2 PRINCIPLE
24 - B3 APPARATUS
24 - B4 SPECIMEN
24 - B5 CONDITIONING
24 - B6 PROCEDURE
25 - B7 CALCULATION
25 - B8 TEST REPORT
26 - APPENDIX C - METHOD FOR THE DETERMINATION OF LOW IMPACT RESISTANCE (DROP-BALL)
26 - C1 SCOPE
26 - C2 PRINCIPLE
26 - C3 APPARATUS
26 - C4 PROCEDURE
26 - C5 TEST REPORT
27 - APPENDIX D - METHOD FOR THE DETERMINATION OF LOW IMPACT RESISTANCE (BALLISTIC)
27 - D1 SCOPE
27 - D2 PRINCIPLE
27 - D3 APPARATUS
28 - D4 PROCEDURE
28 - D5 TEST REPORT
29 - APPENDIX E - METHOD FOR THE DETERMINATION OF MEDIUM IMPACT RESISTANCE
29 - E1 SCOPE
29 - E2 PRINCIPLE
29 - E3 APPARATUS
29 - E4 PROCEDURE
29 - E5 TEST REPORT
30 - APPENDIX F - METHOD FOR THE DETERMINATION OF HIGH IMPACT RESISTANCE
30 - F1 SCOPE
30 - F2 PRINCIPLE
30 - F3 APPARATUS
30 - F4 PROCEDURE
30 - F5 TEST REPORT
31 - APPENDIX G - METHOD FOR THE DETERMINATION OF RESISTANCE TO PENETRATION
31 - G1 SCOPE
31 - G2 PRINCIPLE
31 - G3 APPARATUS
31 - G4 PROCEDURE
31 - G5 TEST REPORT
32 - APPENDIX H - METHOD FOR THE DETERMINATION OF FLAME PROPAGATION
32 - H1 SCOPE
32 - H2 PRINCIPLE
32 - H3 APPARATUS
32 - H4 PROCEDURE
32 - H5 CALCULATION
32 - H6 TEST REPORT
33 - APPENDIX I - METHOD FOR THE DETERMINATION OF NON-ADHERENCE OF MOLTEN METAL
33 - I1 SCOPE
33 - I2 PRINCIPLE
33 - I3 APPARATUS
33 - I4 PROCEDURE
33 - I5 TEST REPORT
35 - APPENDIX J - METHOD FOR THE DETERMINATION OF RESISTANCE TO HOT SOLIDS
35 - J1 SCOPE
35 - J2 PRINCIPLE
35 - J3 APPARATUS
35 - J4 PROCEDURE
35 - J5 TEST REPORT
36 - APPENDIX K - METHOD FOR THE DETERMINATION OF THERMAL STABILITY AT ELEVATED TEMPERATURES
36 - K1 SCOPE
36 - K2 PRINCIPLE
36 - K3 APPARATUS
36 - K4 PROCEDURE
36 - K5 ORDER OF TESTING
36 - K6 ENVIRONMENTAL TEST CONDITIONS
36 - K7 TEST REPORT
37 - APPENDIX L - METHOD FOR THE DETERMINATION OF CORROSION RESISTANCE
37 - L1 SCOPE
37 - L2 PRINCIPLE
37 - L3 REAGENT
37 - L4 APPARATUS
37 - L5 PROCEDURE
37 - L6 TEST REPORT
38 - APPENDIX M - METHOD FOR THE DETERMINATION OF SPLASH RESISTANCE
38 - M1 SCOPE
38 - M2 PRINCIPLE
38 - M3 REAGENT
38 - M4 APPARATUS
38 - M5 PROCEDURE
38 - M6 ASSESSMENT OF RESULTS
38 - M7 TEST REPORT
39 - APPENDIX N - TEST METHOD FOR THE DETERMINATION OF RESISTANCE TO DUST
39 - N1 SCOPE
39 - N2 PRINCIPLE
39 - N3 APPARATUS
39 - N4 PROCEDURE
40 - N5 CALCULATION
40 - N6 TEST REPORT
41 - APPENDIX O - METHOD FOR THE DETERMINATION OF GASTIGHTNESS
41 - O1 SCOPE
41 - O2 PRINCIPLE
41 - O3 REAGENT
41 - O4 APPARATUS
41 - O5 PROCEDURE
41 - O6 ASSESSMENT OF RESULTS
41 - O7 TEST REPORT
42 - APPENDIX P - EXAMPLE OF CALCULATION OF LUMINOUS TRANSMITTANCE
43 - APPENDIX Q - TABLES OF SPECTRAL EFFECTIVENESS AND SPECTRAL IRRADIANCE
44 - APPENDIX R - EXAMPLE OF CALCULATION OF MEAN TRANSMITTANCES
44 - R1 ULTRAVIOLET RADIATION
45 - APPENDIX S - EXAMPLE OF CALCULATION OF COLORATION LIMITS
45 - S1 RED SIGNAL VISIBILITY FACTOR (R)
45 - S2 VIOLET FACTOR (V)

Abstract - (Show below) - (Hide below)

Specifies minimum requirements for eye protectors and associated lenses designed to provide protection for people's eyes in the industrial environment. Types of protection offered are for molten metal, airborne particles and fragments, harmful gases, vapours and aerosols, and sunglare and optical radiation in the natural environment. Markings for lenses to indicate the type of protection offered are also included.

Scope - (Show below) - (Hide below)

This Standard specifies minimum requirements for eye protectors and associated lenses designed to provide protection for the eyes of persons in industrial undertakings against common industrial hazards such as flying particles and fragments, dusts, splashing materials and molten metals, harmful gases, vapours and aerosols. Requirements for optical qualities and low, medium and high impact resistance are given and appendices describing appropriate test methods are included in this Standard.The aim of this Standard is to assist in the provision of safe, efficient and comfortable vision in the industrial situation, including consideration of the need for protection against sunglare and optical radiation in the natural environment.NOTE: The Standard does not apply to filter lenses for protection against optical radiations generated by industrial processes, which are dealt with in AS/NZS 1338, or to lenses for protection against laser radiation.

General Product Information - (Show below) - (Hide below)

Committee	SF-006
Document Type	Standard
ISBN
Pages
Published
Publisher	Standards Australia
Status	Superseded
Superseded By	AS/NZS 1337.1:2010 AS/NZS 1337.0(Int):2010
Supersedes	DR 91189 AS 1337-1984
Under Revision	DR AS/NZS 1337.6 DR 08199

History - (Show below) - (Hide below)

Amendment 2 to AS/NZS 1337:1992 see DR 97025 In Australia First published as AS B99-1951.Revised and redesignated AS Z7-1967.Revised and redesignated AS 1337-1974.Second edition 1981.Third edition 1984. In New Zealand First published as NZS 5816:1986. AS 1337-1984 and NZS 5816:1986 revised, amalgamated and designated as Joint Standard AS/NZS 1337:1992. In Australia First published as AS B99-1951. Revised and redesignated AS Z7-1967. Revised and redesignated AS 1337-1974. Second edition 1981. Third edition 1984. In New Zealand First published as NZS 5816:1986. AS 1337-1984 and NZS 5816:1986 revised, amalgamated and designated as Joint Standard AS/NZS 1337:1992.

Standards Referenced By This Book - (Show below) - (Hide below)

AS 2900.6-1986	Quantities, units, and symbols - Quantities and units of light and related electromagnetic radiations
AS 2900.6-2002	Quantities and units - Light and related electromagnetic radiations
AS/NZS 1338.2:1992	Filters for eye protectors Filters for protection against ultraviolet radiation
AS/NZS 1338.1:1992	Filters for eye protectors Filters for protection against radiation generated in welding and allied operations
AS 1680.1-1990	Interior lighting - General principles and recommendations
AS/NZS 1680.1:2006	Interior and workplace lighting General principles and recommendations
AS/NZS 1338.3:1992	Filters for eye protectors Filters for protection against infra-red radiation
AS 1152-1993	Specification for test sieves

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AS/NZS 2299.1:1999	Occupational diving operations Standard operational practice
AS/NZS 4066:1992	Eye protectors for racquet sports
AS 1988.1-2006	Welding of ferrous castings - Steel castings
AS 2507-1998	The storage and handling of agricultural and veterinary chemicals
AS/NZS 3833:2007	The storage and handling of mixed classes of dangerous goods, in packages and intermediate bulk containers
AS/NZS 1873.1:1994	Powder-actuated (PA) hand-held fastening tools - Selection, operation and maintenance
AS/NZS 1554.3:2002	Structural steel welding - Welding of reinforcing steel
AS/NZS 1554.1:1995	Structural steel welding Welding of steel structures
AS/NZS 2243.3:2002	Safety in laboratories - Microbiological aspects and containment facilities
AS/NZS 1554.1:2004	Structural steel welding Welding of steel structures
AS 2717.3-1992	Welding - Electrodes - Gas metal arc Corrosion-resisting chromium and chromium-nickel steel electrodes
AS 1470-1986	Health and safety at work - Principles and practices
AS 2865-1995	Safe working in a confined space
AS 1627.1-2003	Metal finishing - Preparation and pretreatment of surfaces Removal of oil, grease and related contamination (Reconfirmed 2017)
AS 4326-2008	The storage and handling of oxidizing agents
AS/NZS 1067:2003	Sunglasses and fashion spectacles
AS/NZS ISO 14343:2006	Welding consumables - Wire electrodes, wires and rods for arc welding of stainless and heat-resisting steels - Classification (Reconfirmed 2017)
AS/NZS 2243.1:1997	Safety in laboratories - General
AS 3961-2005	The storage and handling of liquefied natural gas
AS/NZS 1338.3:1992	Filters for eye protectors Filters for protection against infra-red radiation
AS 2562-2005	Hydrometers - Portable syringe-type for lead-acid batteries
AS 3780-1994	The storage and handling of corrosive substances
AS 4067-1994	Firefighters' helmets - Specification
AS/NZS 4836:2001	Safe working on low-voltage electrical installations
AS/NZS 1554.4:2004	Structural steel welding - Welding of high strength quenched and tempered steels
AS 4125.1-2009	Sound laboratory practice in food and water microbiology laboratories - Premises, safety, sample management, regulatory compliance and record management
AS 3580.6.1-1990	Methods for sampling and analysis of ambient air Determination of ozone - Direct-reading instrumental method
AS/NZS 1554.2:2003	Structural steel welding Stud welding (steel studs to steel)
AS 1674.2-2007	Safety in welding and allied processes Electrical (Reconfirmed 2018)
AS/NZS 1554.7:2006	Structural steel welding Welding of sheet steel structures
AS 3765.1-1990	Clothing for protection against hazardous chemicals Protection against general or specific chemicals
AS 1796-2001	Certification of welders and welding supervisors (Reconfirmed 2016)
AS 1188-1990	Radio transmitters and similar equipment - Safe practices
AS 1627.5-2003	Metal finishing - Preparation and pretreatment of surfaces Pickling (Reconfirmed 2017)
AS 1674.2-2003	Safety in welding and allied processes - Electrical
AS 2865-2009	Confined spaces
AS 3853.1-2006	Health and safety in welding and allied processes - Sampling of airborne particles and gases in the operator's breathing zone Sampling of airborne particles
AS/NZS 1554.5:1995	Structural steel welding Welding of steel structures subject to high levels of fatigue loading
AS/NZS 1716:1994	Respiratory protective devices
AS 2402.1.2-2005	Traction batteries - Lead-acid Vented cells - Installation and usage (Reconfirmed 2021)
AS 1627.6-2003	Metal finishing - Preparation and pretreatment of surfaces Chemical conversion treatment of metals (Reconfirmed 2017)
AS/NZS 2299.1:2007	Occupational diving operations Standard operational practice
AS/NZS 1554.4:2010	Structural steel welding Welding of high strength quenched and tempered steels
AS/NZS 3833:1998	The storage and handling of mixed classes of dangerous goods in packages and intermediate bulk containers
AS 1894-1997	The storage and handling of non-flammable cryogenic and refrigerated liquids (Reconfirmed 2021)
AS/NZS 1716:2003	Respiratory protective devices
AS/NZS 4855:2007	Welding consumables - Covered electrodes for manual metal arc welding of non-alloy and fine grain steels - Classification
AS/NZS 1338.1:1992	Filters for eye protectors Filters for protection against radiation generated in welding and allied operations
AS 1485-1983	Safety and health in workrooms of educational establishments
SAA HB 9-1994	Occupational personal protection
AS 1940-2004	The storage and handling of flammable and combustible liquids
AS 1940-2004	The storage and handling of flammable and combustible liquids
AS/NZS 4757:2002	Handling and destruction of drugs
AS 1473-1991	Guarding and safe use of woodworking machinery
AS 2187.4-1998	Explosives - Storage, transport and use Pyrotechnics - Outdoor displays
AS/NZS 1800:1998	Occupational protective helmets - Selection, care and use
AS 4413-1996	Steel tubes - Pressure application - Flash butt welding
AS 4326-1995	The storage and handling of oxidizing agents
AS/NZS 4233.1:1999	High pressure water (hydro) jetting systems - Guidelines for safe operation and maintenance
AS/NZS 2022:2003	Anhydrous ammonia - Storage and handling
HB 213:2003	Guidelines for safe working in a confined space
AS 4024.1-1996	Safeguarding of machinery General principles
AS/NZS 2299.2:2002	Occupational diving operations Scientific diving
AS 2727-1997	Chainsaws - Guide to safe working practices
AS/NZS 4067:2004	Firefighters' helmets
AS 2661-1983	Vapour degreasing plant - Design, installation and operation - Safety requirements
AS/NZS ISO 17633:2006	Welding consumables - Tubular cored electrodes and rods for gas shielded and non-gas shielded metal arc welding of stainless and heat-resisting steels - Classification (ISO 17633:2004, MOD) (Reconfirmed 2017)
AS/NZS 1337.6:2007	Personal eye protection - Prescription eye protectors against low and medium impact
AS 2714-2008	The storage and handling of organic peroxides (Reconfirmed 2021)
AS 1067.1-1990	Sunglasses and fashion spectacles Safety requirements
AS 3780-2008	The storage and handling of corrosive substances
AS 2243.6-1990	Safety in laboratories - Mechanical aspects
AS/NZS 2312:2002	Guide to the protection of structural steel against atmospheric corrosion by the use of protective coatings
AS/NZS 2243.1:2005	Safety in laboratories Planning and operational aspects
AS/NZS 1553.3:1996	Covered electrodes for welding - Corrosion-resisting chromium and chromium-nickel steel electrodes
AS 1473.2-2001	Wood processing machinery - Safety Finishing machinery - Common requirements
AS 3797.2-1991	Hand hammers - Specific requirements for heavy hammers
AS/NZS 2865:2001	Safe working in a confined space
AS/NZS 1554.6:1994	Structural steel welding - Welding stainless steels for structural purposes
AS/NZS 4173:1994	Guide to the safe use of lasers in health care
AS/NZS 4681:2000	The storage and handling of Class 9 (miscellaneous) dangerous goods and articles
AS/NZS 2243.2:1997	Safety in laboratories - Chemical aspects
AS 2228.1-1992	Spectacles - Spectacle lenses
AS 4332-2004	The storage and handling of gases in cylinders (Reconfirmed 2016)
AS/NZS 2541:1998	Guide to the cleaning-in-place of dairy factory equipment
SAA/SNZ HB32:1995	Control of microbial growth in air-handling and water systems in buildings (Reconfirmed 2016)
AS 3853.2-2006	Health and safety in welding and allied processes - Sampling of airborne particles and gases in the operator's breathing zone Sampling of gases
AS 2228.2-1992	Spectacles - Spectacle frames
AS/NZS 1554.5:2004	Structural steel welding Welding of steel structures subject to high levels of fatigue loading
AS 2402.2.2-2005	Traction batteries - Lead-acid Valve-regulated cells - Installation and usage (Reconfirmed 2021)
AS 5034-2005	Installation and use of inert gases for beverage dispensing
AS/NZS 4233(INT):1994	High pressure water jetting systems - Safe operation and maintenance
AS 2714-1993	The storage and handling of hazardous chemical materials - Class 5.2 substances (organic peroxides)
AS/NZS 1554.1:2000	Structural steel welding Welding of steel structures
AS/NZS 2243.3:1995	Safety in laboratories Microbiology
AS/NZS 1338.2:1992	Filters for eye protectors Filters for protection against ultraviolet radiation
AS 2601-2001	The demolition of structures
AS/NZS 2312:1994	Guide to the protection of iron and steel against exterior atmospheric corrosion
AS/NZS 1554.3:2008	Structural steel welding Welding of reinforcing steel
AS/NZS 1336:1997	Recommended practices for occupational eye protection
AS/NZS 2243.2:2006	Safety in laboratories Chemical aspects
AS/NZS 1873.1:2003	Powder-actuated (PA) hand-held fastening tools - Selection, operation and maintenance
AS 3710-1989	Vibration and shock - Balancing machines - Enclosure and other safety measures
AS/NZS 4452:1997	The storage and handling of toxic substances
AS/NZS 4081:2001	The storage and handling of liquid and liquefied polyfunctional isocyanates (Reconfirmed 2021)
AS/NZS 1554.4:1995	Structural steel welding - Welding of high strength quenched and tempered steels
AS 4839-2001	The safe use of portable and mobile oxy-fuel gas systems for welding, cutting, heating and allied processes (Reconfirmed 2016)
AS/NZS 3957:2006	Light-transmitting screens and curtains for welding operations
AS/NZS 1665:2004	Welding of aluminium structures (Reconfirmed 2016)
AS 4332-1995	The storage and handling of gases in cylinders
AS/NZS 1801:1997	Occupational protective helmets

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