AS/NZS 4020:1999

1 - AS/NZS 4020:1999 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 Extract (leachate) water
9 - 3.9 Maximum holding water temperature
9 - 3.10 Mutagenic
9 - 3.11 Organoleptic
9 - 3.12 Product
9 - 3.13 Sample
9 - 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
10 - 4.2 Range of product sizes
10 - 4.3 Product exposure
10 - 5 SCALING FACTORS
11 - 6 TEST REQUIREMENTS
11 - 6.1 General
11 - 6.2 Taste of water extract
11 - 6.3 Appearance of water extract
11 - 6.4 Growth of aquatic micro-organisms
11 - 6.5 Cytotoxic activity of water extract
11 - 6.6 Mutagenic activity of water extract
12 - 6.7 Extraction of metals
12 - 6.7.1 Products in general
13 - 6.7.2 End-of-line fittings
13 - 7 HOT WATER TESTS
14 - APPENDIX A - SAMPLE PREPARATION
14 - A1 SCOPE
14 - A2 APPARATUS
14 - A2.1 Paper storage bags
14 - A2.2 Glass plates
14 - A2.3 Not applicable
14 - A2.4 Test container
14 - A2.5 Temperature-measuring device
14 - A2.6 Relative humidity-measuring device
14 - A2.7 Glass-encapsulated weights
14 - A3 NATURE OF SAMPLES
15 - A4 PRODUCT EXPOSURE
15 - A4.1 In-the-product exposure
15 - A4.2 Immersion exposure
15 - A5 SAMPLE TRANSPORT AND STORAGE
16 - A6 SAMPLE WASHING
16 - A7 SPECIAL PRODUCTS
16 - A7.1 General
16 - A7.2 Elastomeric products
16 - A7.3 Greases
16 - A7.4 Coatings
17 - A7.5 Sealing compounds
17 - A7.6 Jointing compounds
17 - A7.7 Solder fluxes
18 - A7.8 Anaerobic adhesives
18 - A8 CEMENTITIOUS PRODUCTS
19 - APPENDIX B - SCALING FACTORS- DERIVATION AND APPLICATION
19 - B1 INTRODUCTION
19 - B2 CALCULATION OF SCALING FACTORS
19 - B3 EXAMPLES OF SCALING FACTOR CALCULATIONS
19 - B3.1 Sealing gasket (immersion exposure)
20 - B3.2 Sluice valve (in-the-product exposure)
20 - B3.3 Domestic plumbing systems
21 - B4 APPLICATION OF SCALING FACTOR
23 - APPENDIX C - TEST METHOD-TASTE OF WATER EXTRACT
23 - C1 SCOPE
23 - C2 INTRODUCTION
23 - C3 PRINCIPLE
23 - C4 TEST PREMISES
24 - C5 REAGENTS
24 - C5.1 Test waters
24 - C5.2 Sodium hypochlorite solution
24 - C5.3 Distilled water
24 - C6 APPARATUS
24 - C6.1 Test containers
24 - C6.2 Dilution beakers
24 - C6.3 Water bath and incubator
24 - C6.4 Tasting glass
24 - C6.5 Glass-encapsulated weights
24 - C7 SELECTION OF TASTE PANELLISTS
24 - C7.1 Taste panel requirements
25 - C7.2 Initial sensitivity test
25 - C7.3 Regular assessment
26 - C7.4 Personal logs
26 - C8 CROSS-CONTAMINATION OF SAMPLES
26 - C9 PROCEDURE
26 - C9.1 Extraction
27 - C9.2 Taste test dilutions
27 - C9.3 Tasting procedure
27 - C9.4 Extraction procedure using chlorinated water
28 - C10 EXPRESSION OF RESULTS
28 - C10.1 Validation
28 - C10.2 Expression of results
28 - C11 TEST REPORT
29 - C12 LIST OF TASTES
30 - APPENDIX D - TEST METHOD-APPEARANCE OF WATER EXTRACT
30 - D1 SCOPE
30 - D2 PRINCIPLE
30 - D3 REAGENTS
30 - D3.1 Test water
30 - D3.2 Colour matching solutions
30 - D3.3 Formazine solutions
30 - D4 APPARATUS
30 - D4.1 Laboratory ware
30 - D4.2 Test containers
30 - D4.3 Colour measurement apparatus
30 - D4.4 Incubator
30 - D4.5 Turbidity measurement apparatus
30 - D4.6 Glass-encapsulated weights
30 - D5 SAMPLES
31 - D6 PROCEDURE
31 - D6.1 General
31 - D6.2 Further extracts
31 - D7 MEASUREMENT OF COLOUR AND TURBIDITY
32 - D8 CALCULATIONS
32 - D9 TEST REPORT
34 - APPENDIX E - TEST METHOD-GROWTH OF AQUATIC MICRO- ORGANISMS
34 - E1 SCOPE
34 - E2 INTRODUCTION
35 - E3 PRINCIPLE
35 - E4 TEST PREMISES
35 - E5 SAFETY
35 - E6 REAGENTS
35 - E6.1 General
35 - E6.2 Inoculum water
36 - E6.3 Test water
37 - E7 APPARATUS
37 - E7.1 Test containers
37 - E7.2 Dissolved oxygen meter
37 - E7.3 Incubator/chamber
37 - E7.4 Glass-encapsulated weights
37 - E8 SAMPLES
37 - E8.1 General requirements
38 - E8.2 Reference materials
38 - E9 TEST PROCEDURES
38 - E9.1 Preparation of the test system
38 - E9.2 Incubation
38 - E9.3 Assessment of microbial growth
39 - E9.4 Measurement of dissolved oxygen for lubricants and lubricated materials
39 - E10 EXPRESSION OF RESULTS
39 - E10.1 Calculation of results
39 - E10.2 Validation of results
40 - E10.3 Precision
40 - E11 APPLICATION OF SCALING FACTOR
40 - E12 TEST REPORT
42 - APPENDIX F - TEST METHOD- CYTOTOXIC ACTIVITY OF WATER EXTRACT
42 - F1 SCOPE
42 - F2 PRINCIPLE
42 - F3 TEST PREMISES
42 - F4 REAGENTS
42 - F4.1 Test water
42 - F4.2 Distilled water
42 - F4.3 Media
44 - F4.4 Cell line
44 - F5 APPARATUS
44 - F5.1 Tissue-culture ware
44 - F5.2 Haemocytometer counting chamber
44 - F5.3 Test containers
44 - F5.4 Incubators
44 - F5.5 Glass-encapsulated weights
44 - F6 TEST SAMPLES
44 - F7 TEST PROCEDURE
44 - F7.1 Introduction
44 - F7.2 Maintenance of the cell line
45 - F7.3 Preparation of cell suspension
45 - F7.4 Extraction procedure
46 - F7.5 Growth procedure
46 - F7.6 Microscopic examination
46 - F7.7 Expression of results
46 - F8 TEST REPORT
48 - APPENDIX G - TEST METHOD- MUTAGENIC ACTIVITY OF WATER EXTRACT
48 - G1 SCOPE
48 - G2 PRINCIPLE
49 - G3 TEST PREMISES
49 - G4 REAGENTS
49 - G4.1 Test water
49 - G4.2 Distilled water
49 - G4.3 Resin columns
49 - G4.4 Resin column eluent
49 - G4.5 Resin column eluate replacement solvents
49 - G4.6 Control mutagens
49 - G4.7 Medium
49 - G4.8 Bacteria
50 - G5 APPARATUS
50 - G5.1 Bacteria-culture ware
50 - G5.2 Test containers
50 - G5.3 Incubators
50 - G5.4 Glass concentration columns
50 - G5.5 Rotary evaporator
50 - G5.6 Glass-encapsulated weights
50 - G6 TEST SAMPLES
50 - G7 TEST PROCEDURE
50 - G7.1 Introduction
50 - G7.2 Extraction procedure
51 - G7.3 Test method
51 - G7.4 Controls
51 - G7.5 Interpretation of results
52 - G8 TEST REPORT
53 - APPENDIX H - TEST METHOD-EXTRACTION OF METALS
53 - H1 SCOPE
53 - H2 LIMIT OF DETECTION AND SENSITIVITY
53 - H3 PRINCIPLE
53 - H4 REAGENTS
53 - H4.1 Test water
53 - H4.2 Nitric acid
53 - H4.3 Nitric acid
53 - H5 APPARATUS
53 - H5.1 Cleaning
53 - H5.2 Test containers
53 - H5.3 Bottles
53 - H5.4 Incubator
53 - H5.5 Glass-encapsulated weights
53 - H6 TEST SAMPLES
53 - H6.1 General requirements
54 - H6.2 Number of tests
54 - H7 PROCEDURE
54 - H7.1 Extraction
55 - H7.2 Determination of extracted metals
56 - H8 EXPRESSION OF RESULTS
56 - H9 TEST REPORT
58 - APPENDIX I - TEST METHOD-METALS EXTRACTION TEST FOR END-OF-LINE FITTINGS
58 - I1 SCOPE
58 - I2 PRINCIPLE
58 - I3 APPARATUS
58 - I3.1 Test rig
58 - I3.2 Measuring vessels
58 - I4 REAGENTS
58 - I4.1 Test water
58 - I4.2 Methanol
58 - I5 TEST FITTINGS
58 - I5.1 General
58 - I5.2 Number of tests
58 - I6 TEST PROCEDURE
59 - I7 RESULTS
59 - I8 TEST REPORT
62 - APPENDIX J - HIGH TEMPERATURE TESTS
62 - J1 SCOPE
62 - J2 PRINCIPLE
62 - J3 APPARATUS
62 - J3.1 Water bath or incubator
62 - J4 SAMPLES
62 - J5 TEST PROCEDURE
62 - J5.1 Extraction temperature
63 - J5.2 Extraction procedure
63 - J5.3 Testing
63 - J6 EXPRESSION OF RESULTS
63 - J7 TEST REPORT
64 - APPENDIX K - SUGGESTED PRODUCT SUBMISSION FORM

Specifies requirements for the suitability of products for use in contact with drinking water. Appendices contain test methods for evaluating those parameters that may adversely affect the quality of the water. The use of scaling factors to relate these parameters to end-use conditions is provided.

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.This Standard attempts to reproduce the types of conditions experienced during site application. However, where materials are mixed on site, often in approximate proportions, and cured in adverse conditions of temperature and humidity, this will not always be achieved.

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