AS/NZS 4020:2002

1 - AS/NZS 4020:2002 TESTING OF PRODUCTS FOR USE IN CONTACT WITH DRINKING WATER
4 - PREFACE
5 - CONTENTS
6 - FOREWORD
7 - 1 SCOPE
7 - 2 REFERENCED DOCUMENTS
9 - 3 DEFINITIONS
9 - 3.1 Anaerobic adhesive
9 - 3.2 Colour (true colour)
9 - 3.3 Composite product
9 - 3.4 Cytotoxic
9 - 3.5 Drinking water
9 - 3.6 End-of-line fitting
9 - 3.7 Extract (leachate)
9 - 3.8 Extractant water
9 - 3.9 Maximum holding water temperature
9 - 3.10 Mutagenic
10 - 3.11 Organoleptic
10 - 3.12 Product
10 - 3.13 Sample
10 - 3.14 Scaling factor
10 - 3.15 Taste panellist
10 - 3.16 Test water
10 - 3.17 Threshold dilution
10 - 3.18 Turbidity
10 - 3.19 Water fitting
10 - 4 TEST SAMPLES
10 - 4.1 Selection and preparation of samples
11 - 4.2 Range of product sizes
11 - 4.3 Product exposure
11 - 5 SCALING FACTORS
11 - 5.1 General
12 - 5.2 Determination of scaling factors
12 - 5.3 Application of scaling factors
12 - 5.4 Restrictions on the use of scaling factors
13 - 6 TEST REQUIREMENTS
13 - 6.1 General
13 - 6.2 Taste of water extract
13 - 6.3 Appearance of water extract
13 - 6.4 Growth of aquatic micro-organisms
13 - 6.5 Cytotoxic activity of water extract
13 - 6.6 Mutagenic activity of water extract
14 - 6.7 Extraction of metals
14 - 6.7.1 Products in general
14 - 6.7.2 End-of-line fittings
14 - 7 HOT WATER TESTS
17 - APPENDIX A - SAMPLE PREPARATION
17 - A1 SCOPE
17 - A2 APPARATUS
17 - A2.1 Sample storage bags,
17 - A2.2 Glass plates,
17 - A2.3 Test containers,
17 - A2.4 Temperature-measuring device
17 - A2.5 Relative humidity-measuring device
17 - A2.6 Glass-encapsulated weights,
17 - A3 SAMPLES
17 - A3.1 Nature of samples
18 - A4 PRODUCT EXPOSURE
18 - A4.1 In-the-product exposure
18 - A4.2 Immersion exposure
19 - A5 SAMPLE TRANSPORT AND STORAGE
19 - A6 SAMPLE WASHING
19 - A7 SPECIAL PRODUCTS
19 - A7.1 General
19 - A7.2 Elastomeric products
19 - A7.3 Greases
19 - A7.4 Coatings
20 - A7.5 Sealing compounds
21 - A7.6 Jointing compounds
21 - A7.7 Solder fluxes
21 - A7.8 Anaerobic adhesives
21 - A8 CEMENTITIOUS PRODUCTS
22 - A9 METAL ALLOYS
23 - APPENDIX B - SCALING FACTORS-DERIVATION AND APPLICATION
23 - B1 INTRODUCTION
23 - B2 CALCULATION OF SCALING FACTORS
23 - B3 EXAMPLES OF SCALING FACTOR CALCULATIONS
23 - Example 1: Sealing gasket (immersion exposure)
24 - Example 2 Sluice valve (in-the-product exposure)
24 - Example 3 Domestic plumbing systems
27 - APPENDIX C - TEST METHOD-TASTE OF WATER EXTRACT
27 - C1 SCOPE
27 - C2 INTRODUCTION
27 - C3 PRINCIPLE
27 - C4 TEST PREMISES
28 - C5 REAGENTS
28 - C5.1 Test waters
28 - C5.2 Sodium hypochlorite solution
28 - C5.3 Distilled water,
28 - C6 APPARATUS
28 - C6.1 Test containers,
28 - C6.2 Dilution beakers,
28 - C6.3 Water bath and incubator,
28 - C6.4 Tasting glass,
28 - C6.5 Glass-encapsulated weights,
29 - C7 SELECTION OF TASTE PANELLISTS
29 - C7.1 Taste panel requirements
29 - C7.2 Initial sensitivity test
30 - C7.3 Regular assessment
30 - C7.4 Personal logs
30 - C8 CROSS-CONTAMINATION OF SAMPLES
30 - C9 TEST PROCEDURE
30 - C9.1 Extraction
31 - C9.2 Taste test dilutions
31 - C9.3 Tasting procedure
32 - C9.4 Extraction procedure using chlorinated water
32 - C10 EXPRESSION OF RESULTS
32 - C10.1 Validation
32 - C10.2 Expression of results
32 - C11 TEST REPORT
33 - C12 LIST OF TASTES
34 - APPENDIX D - TEST METHOD-APPEARANCE OF WATER EXTRACT
34 - D1 SCOPE
34 - D2 PRINCIPLE
34 - D3 REAGENTS
34 - D3.1 Test water,
34 - D3.2 Colour matching solutions,
34 - D3.3 Formazine solutions,
34 - D4 APPARATUS
34 - D4.1 Laboratory ware,
34 - D4.2 Test containers,
34 - D4.3 Colour measurement apparatus,
34 - D4.4 Incubator,
34 - D4.5 Turbidity measurement apparatus,
34 - D4.6 Glass-encapsulated weights,
35 - D5 SAMPLES
35 - D6 TEST PROCEDURE
35 - D6.1 General
35 - D6.2 Further extracts
35 - D7 MEASUREMENT OF COLOUR AND TURBIDITY
36 - D8 CALCULATIONS
36 - D9 TEST REPORT
38 - APPENDIX E - TEST METHOD-GROWTH OF AQUATIC MICRO-ORGANISMS
38 - E1 SCOPE
38 - E2 INTRODUCTION
39 - E3 PRINCIPLE
39 - E4 TEST PREMISES
39 - E5 SAFETY
39 - E6 REAGENTS
39 - E6.1 General
39 - E6.2 Inoculum water,
40 - E6.3 Test water
41 - E7 APPARATUS
41 - E7.1 Test containers
41 - E7.2 Dissolved oxygen meter,
41 - E7.3 Incubator/chamber,
41 - E7.4 Glass-encapsulated weights,
41 - E8 SAMPLES
41 - E8.1 General requirements
42 - E8.2 Reference materials
42 - E9 TEST PROCEDURES
42 - E9.1 Preparation of the test system
42 - E9.2 Incubation
43 - E9.3 Assessment of microbial growth
43 - E9.4 Measurement of dissolved oxygen for lubricants and lubricated materials
44 - E10 EXPRESSION OF RESULTS
44 - E10.1 Calculation of results
44 - E10.2 Validation of results
44 - E10.3 Precision
44 - E11 APPLICATION OF SCALING FACTOR
44 - E12 TEST REPORT
46 - APPENDIX F - TEST METHOD-CYTOTOXIC ACTIVITY OF WATER EXTRACT
46 - F1 SCOPE
46 - F2 PRINCIPLE
46 - F3 TEST PREMISES
46 - F4 REAGENTS
46 - F4.1 Test water,
46 - F4.2 Distilled water
46 - F4.3 Media
48 - F4.4 Cell line
48 - F5 APPARATUS
48 - F5.1 Tissue-culture ware,
48 - F5.2 Haemocytometer counting chamber,
48 - F5.3 Test containers,
48 - F5.4 Incubators,
48 - F5.5 Glass-encapsulated weights,
48 - F6 TEST SAMPLES
48 - F7 TEST PROCEDURE
48 - F7.1 Introduction
48 - F7.2 Maintenance of the cell line
49 - F7.3 Preparation of cell suspension
49 - F7.4 Extraction procedure
50 - F7.5 Growth procedure
50 - F7.6 Microscopic examination
50 - F7.7 Expression of results
51 - F8 TEST REPORT
53 - APPENDIX G - TEST METHOD-MUTAGENIC ACTIVITY OF WATER EXTRACT
53 - G1 SCOPE
53 - G2 PRINCIPLE
53 - G3 TEST PREMISES
53 - G4 REAGENTS
53 - G4.1 Test water,
54 - G4.2 Distilled water
54 - G4.3 Control mutagens,
54 - G4.4 Medium,
54 - G4.5 Bacteria
54 - G5 APPARATUS
54 - G5.1 Bacteria-culture ware,
54 - G5.2 Test containers,
55 - G5.3 Incubators,
55 - G5.4 Glass-encapsulated weights,
55 - G6 TEST SAMPLES
55 - G7 TEST PROCEDURE
55 - G7.1 Introduction
55 - G7.2 Extraction procedure
55 - G7.3 Modified Ames test
56 - G7.4 Controls
56 - G7.5 Interpretation of results
56 - G8 TEST REPORT
58 - APPENDIX H - TEST METHOD-EXTRACTION OF METALS
58 - H1 SCOPE
58 - H2 LIMIT OF DETECTION AND SENSITIVITY
58 - H3 PRINCIPLE
58 - H4 REAGENTS
58 - H4.1 Test water,
58 - H4.2 Nitric acid,
58 - H4.3 Nitric acid,
58 - H5 APPARATUS
58 - H5.1 Cleaning
58 - H5.2 Test containers,
58 - H5.3 Bottles,
58 - H5.4 Incubator,
58 - H5.5 Glass-encapsulated weights,
59 - H6 TEST SAMPLES
59 - H6.1 General requirements
59 - H6.2 Number of tests
59 - H7 TEST PROCEDURE
59 - H7.1 Extraction
60 - H7.2 Determination of extracted metals
61 - H8 EXPRESSION OF RESULTS
61 - H9 TEST REPORT
63 - APPENDIX I - TEST METHOD-EXTRACTION PROCEDURES FOR END-OF-LINE FITTINGS
63 - I1 SCOPE
63 - I2 PRINCIPLE
63 - I3 APPARATUS
63 - I3.1 Test rig (for test procedure I6.3)
64 - I3.2 Measuring vessels,
64 - I4 REAGENTS (for test procedure I6.3)
64 - I4.1 Test water
64 - I4.2 Methanol
64 - I5 TEST FITTINGS (for test procedure I6.3)
64 - I6 TEST PROCEDURE
64 - I6.1 Test procedure for extracts for Appendices C and D
65 - I6.2 Test procedure for extracts for Appendix F and G
66 - I6.3 Test procedure for extracts for Appendix H
67 - I7 EXPRESSION OF RESULTS
67 - I8 TEST REPORT
68 - APPENDIX J - HIGH TEMPERATURE TESTS
68 - J1 SCOPE
68 - J2 PRINCIPLE
68 - J3 APPARATUS
68 - J3.1 Water bath or incubator,
68 - J4 SAMPLES
68 - J5 TEST PROCEDURE
68 - J5.1 Extraction temperature
69 - J5.2 Extraction procedure
69 - J5.3 Testing
69 - J6 EXPRESSION OF RESULTS
69 - J7 TEST REPORT
70 - APPENDIX K - TEST METHOD-SAMPLE EXTRACTION PROCEDURE FOR USE WITH WATER-HEATING SYSTEMS
70 - K1 SCOPE
70 - K2 PRINCIPLE
70 - K3 REAGENTS
70 - K3.1 Test water
70 - K4 TEST PROCEDURE
70 - K4.1 Installation
71 - K4.2 Test method
74 - K5 EXPRESSION OF RESULTS
74 - K6 TEST REPORT
75 - APPENDIX L - SUGGESTED PRODUCT SUBMISSION FORM
78 - APPENDIX M - SIMULATED SAMPLES
78 - M1 SCOPE
78 - M2 GENERAL
78 - M3 TYPICAL EXAMPLES OF SIMULATED SAMPLES
78 - M4 SPECIAL ISSUES
79 - M5 COMPONENT DOCUMENTATION
79 - M6 ACCEPTANCE

Sets out requirements for the suitability of products for use in contact with drinking water. Appendices provide test methods for evaluating those parameters that have the potential to affect the quality of water.

This Standard specifies requirements for the suitability of products for use in contact with drinking water, with regard to their effect on the quality of water. These products include all items such as pipes, fittings, components, and materials used in coating, protection, lining, jointing, sealing and lubrication applications in the water supply and plumbing industry. The Standard requires that products intended for use in contact with drinking water be tested by exposure to extractant waters. Where appropriate, a scaling factor is applied to such tests to compensate for differences between laboratory and field conditions. This Standard does not take into account possible changes in materials, methods of manufacture or installation, nor is any consideration given to the frequency of testing of products. These should be covered by relevant product Standards. As a guide, products that have already been tested and comply with this Standard in the short term do not need to be retested. However, re-verification testing of products to this Standard is generally desirable after a period of five years. This is consistent with the requirements of overseas bodies such as the Drinking Water Inspectorate in the United Kingdom. Chemicals and media used directly for treating raw water to provide a suitable drinking water supply (e.g. lime, coagulants, activated carbon, ion-exchange resins) are not covered by this Standard.

First published as AS 3855(Int)-1991.
Redesignated AS 4020(Int)-1992.
Second edition 1994.
Jointly revised and designated AS/NZS 4020:1999.
Fourth edition 2002.