【AS澳大利亚标准】AS NZS 3750.6-2009 Paints for steel structures Part 6 Full gloss polyurethane (twopack).doc

as/nzs 3750.6:2009as/nzs 3750.6:2009australian/new zealand standardpaints for steel structurespart 6: full gloss polyurethane (two- pack)the standard is downloaded from standard sharingas/nzs 3750.6:2009this joint australian/new zealand standard was prepared by joint technical committee ch-003, paints and related materials. it was approved on behalf of the council of standards australia on 16 march 2009 and on behalf of the council of standards new zealand on 27 march 2009.this standard was published on 20 april 2009.the following are represented on committee ch-003:austroadsaustralasian corrosion associationaustralian paint approval schemeaustralian paint manufacturers federationaustralian pipeline industry associationbusiness new zealandengineers australiainstitution of professional engineers new zealandmaster painters australiamaster painters new zealand associationnational association of testing authorities australiawater corporation western australiakeeping standards up-to-datestandards are living documents which reflect progress in science, technology and systems. to maintain their currency, all standards are periodically reviewed, and new editions are published. between editions, amendments may be issued. standards may also be withdrawn. it is important that readers assure themselves they are using a current standard, which should include any amendments which may have been published since the standard was purchased.detailed information about joint australian/new zealand standards can be found by visiting the standards web shop at .au or standards new zealand web site at www.standards.co.nz and looking up the relevant standard in the on-line catalogue.alternatively, both organizations publish an annual printed catalogue with full details of all current standards. for more frequent listings or notification of revisions, amendments and withdrawals, standards australia and standards new zealand offer a number of update options. for information about these services, users should contact their respective national standards organization.we also welcome suggestions for improvement in our standards, and especially encourage readers to notify us immediately of any apparent inaccuracies or ambiguities. please address your comments to the chief executive of either standards australia or standards new zealand at the address shown on the back cover.this standard was issued in draft form for comment as dr 07098.as/nzs 3750.6:2009australian/new zealand standardpaints for steel structurespart 6: full gloss polyurethane (two- pack)originated as as 26021983. previous edition as/nzs 3750.6:1995. second edition 2009.copyright standards australia/standards new zealandall rights are reserved. no part of this work may be reproduced or copied in any form or by any means, electronic or mechanical, including photocopying, without the written permission of the publisher.jointly published by standards australia, gpo box 476, sydney, nsw 2001 and standardsnew zealand, private bag 2439, wellington 6020isbn 0 7337 9122 03as/nzs 3750.6:2009the standard is downloaded from standard sharingprefacethis standard was prepared by the joint standards australia/standards new zealand committee ch-003, paints and related materials to supersede as/nzs 3750.6:1995. it is part of a series of product standards for paints referred to in as/nzs 2312, guide to the protection of structural steel against atmospheric corrosion by the use of protective coatings.the objective of this standard is to specify requirements for full gloss polyurethane paints used on steel structures. this standard includes information on high-build paints and supersedes as/nzs 3750.6:1995.the following standards in this series have been published: as2364paints for steel structureshigh build epoxy (two-pack)2672paints for steel structureschlorinated rubber, high build2673paints for steel structuresalkyd/micaceous iron oxide2674paints for steel structuresepoxy primer (two-pack)3750paints for steel structures3750.1part 1: epoxy mastic (two-pack)for rusted steel3750.2part 2: ultra high-build paint3884etch primers (single pack and two-pack) for pretreating metal surfaces3885paints for steel structuresgalvanized and zinc primedlatex3887paints for steel structurescoal tar epoxy (two-pack) as/nzspaints for steel structures3750.3part 3: heat-resistingexterior3750.4part 4: bitumen paint3750.5part 5: acrylic full gloss (two-pack)3750.6part 6: full gloss polyurethane (two-pack) (this standard)3750.7part 7: aluminium paint3750.8part 8: vinyl paintsprimer, high-build and gloss3750.9part 9: organic zinc-rich primer3750.10part 10: full gloss epoxy (two-pack)3750.11part 11: chlorinated rubberhigh-build and glass3750.12part 12: alkyd/micaceous iron oxide3750.13part 13: epoxy primer (two-pack)3750.14part 14: high-build epoxy (two-pack)3750.15part 15: inorganic zinc silicate paint3750.16part 16: waterborne primer and paint for galvanized, zinc/aluminium alloy- coated and zinc-primed steel3750.17part 17: etch primers (single pack and two-pack)3750.18part 18: moisture cure urethane (single-pack) systems3750.19part 19: metal primergeneral purpose3750.20part 20: anticorrosive metal primersolvent-bornelead and chromate free3750.21part 21: undercoatsolvent-borne3750.22part 22: full gloss enamelsolvent-borne3750.23part 23: semi-gloss enamelsolvent-bornethe terms normative and informative have been used in this standard to define the application of the appendix to which they apply. a normative appendix is an integral part of a standard, whereas an informative appendix is only for information and guidance.contentspagesection 1 scope and general1.1scope . 41.2referenced documents . 41.3definitions . 41.4safety precautions . 5section 2 material requirements2.1general . 62.2conditions of test. 62.3liquid paint. 62.4application properties . 62.5applied film . 7section 3 packaging and labelling3.1packaging. 123.2labelling . 12appendicesapurchasing guidelines. 13bguidance on the use and application of full gloss polyurethane paint . 14creferenced documents . 17dpreparation of test panels . 1919as/nzs 3750.6:2009the standard is downloaded from standard sharingstandards australia/standards new zealandaustralian/new zealand standardpaints for steel structurespart 6: full gloss polyurethane (two-pack)s e c t i o n1s c o p ea n dg e n e r a l1.1 scopethis standard specifies requirements for two-component, solvent-borne, full gloss polyurethane paints intended to be used primarily for the protection of structural steel against exterior atmospheric corrosion. a full gloss polyurethane consists essentially of a polyester, polyacrylate or other polyol base cured with an aliphatic isocyanate hardener and appropriate pigments and solvents.these paints are intended for use as an aesthetic topcoat for the protection of iron and steel against corrosion involving wet and damp areas, high humidity, coastal/marine and industrial fallout or as a wear and tear or stain or chemically resistant finish. polyurethane paints are particularly suited to applications where it is desirable to retain colour and gloss in addition to providing corrosion resistance. for the purpose of this standard polyurethane paints are divided into two types by intended end use:(a) type 1: a general purpose industrial two-pack polyurethane coating. typically used on plant and equipment and in structural applications where a higher level of aesthetic performance than conventional alkyd or epoxy finishes is required.(b) type 2: an industrial two-pack polyurethane coating giving premium levels of aesthetic performance.both types may be available as either low or high volume solids formulations. they are best applied by conventional air or airless spraying but may also be formulated specifically for brush and roller application.notes:1appendix a contains recommendations and advice on information that should be provided by the purchaser at the time of enquiry or order.2additional information on the use and application of polyurethane paints is contained inappendix b.1.2 referenced documentsa list of the documents referred to in this standard is contained in appendix c.1.3 definitionsfor the purpose of this standard, the definitions given in as/nzs 2310 and those below apply.1.3.1 componenteach of two parts of the paint that, when mixed together, form the pigmented full gloss polyurethane paint.copyright1.4 safety precautionspolyurethane coatings contain free isocyanate monomer, reactive chemicals and flammable solvents, which may present a risk to users. the manufacturers material safety data sheet (msds) should be adhered to.personal protective equipment, as recommended by the manufacturers msds, should be worn during mixing and application.the standard is downloaded from standard sharings e c t i o n2m a t e r i a lr e q u i r e m e n t s 2.1 generalthe paint shall comply with the requirements detailed in clauses 2.3 to 2.5 inclusive. these properties and requirements are summarized in table 1.2.2 conditions of testunless otherwise specified in this standard, the following test conditions shall apply:(a) the test panel material and its preparation shall be in accordance with appendix d. (b)the type and size of test panels shall be as specified in table 1.(c) conditions for testing shall be in accordance with as/nzs 1580.101.5.(d) conditions for air-drying shall be in accordance with as/nzs 15.3 liquid paint2.3.1 condition in containerwhen each component is tested in accordance with as/nzs 1580.103.1 at the time of delivery from the manufacturer/supplier, it shall be free from gel, coarse particles, skins and foreign matter.2.3.2 volume solidsvolume solids of the mixed paint shall be reported by the manufacturer.2.3.3 storage properties degree of settlingwhen stored at 23 3c in sealed, unopened containers for 12 months from the date of manufacture, the rating for the settling of either component, when determined in accordance with as/nzs 1580.211.1, shall be not less than .2 re-incorporation after storagewhen stored at 23 3c in sealed, unopened containers for 12 months from the date of manufacture, and tested in accordance with as/nzs 1580.211.2, the components shall be readily re-incorporated and, when mixed in the recommended proportions, shall produce a paint of uniform consistency free from lumps, gel and other defects.2.4 application properties2.4.1 generalapplication properties shall be assessed using vertical steel test panels prepared in accordance with appendix d. when applied in accordance with the manufacturers recommended methods of application, the applied film shall not run, streak or sag.2.4.2 brushingwhen thinned, if necessary, and applied to a test panel (see clause 2.2) in accordance with as/nzs 1580.205.1, the test paint shall exhibit satisfactory brushing properties and freedom from defects.2.4.3 rollingwhen thinned, if necessary, and applied to a test panel (see clause 2.2) in accordance with as/nzs 1580.205.3, the test paint shall exhibit satisfactory rolling properties and freedom from defects.2.4.4 sprayingwhen thinned, if necessary, and applied to a test panel (see clause 2.2) in accordance with as/nzs 1580.205.2 or as/nzs 1580.205.4 as appropriate, the test paint shall exhibit good spraying properties and shall not clog the spray gun.note: the panel should be retained for assessment of finish (see clause 2.5.6).2.4.5 pot-life assessmentwhen initially mixed and thinned as appropriate to the method of application, and again at the end of the manufacturers stated pot life, a 4 l volume of the paint shall be tested in accordance with as/nzs 1580.205.2 or as/nzs 1580.205.4. when applied at the manufacturers maximum recommended thickness, it shall exhibit satisfactory spraying properties.when dry, the film shall be free from sags, runs, pinholes, craters and any other film defect. for high solids paints, a slight orange peel effect is characteristic and shall not be classified as a defect.2.5 applied film2.5.1 surface-dry timewhen one coat of test paint is applied to a test panel using the appropriate spreading rate and tested in accordance with as/nzs 1580.401.1, the surface-dry time shall be in accordance with the manufacturers data.2.5.2 hard-dry timewhen one coat of test paint is applied to a test panel using the appropriate spreading rate and tested in accordance with as 1580.401.5, the hard-dry time shall be in accordance with the manufacturers data.2.5.3 scratch resistancewhen one coat of test paint is applied to a test panel and is cured for 7 days and then tested in accordance with as/nzs 1580.403.1, the film shall withstand a load of 1.5 kg.the standard is downloaded from standard sharingtable 1summary of properties of full gloss polyurethane paint for steelclause numberpropertyrequirementtest methodtest panel materialminimum test panel size, mm2.3.1condition in containerfree from gel, coarse particles, skinas/nzs 1580.103.1n/adegree of settling(12 months)settlement rating 6as/nzs 1580.211.1n/are-incorporation after storage (12 months)readily re-incorporated;uniform; free from lumps, gelas/nzs 1580.211.2n/a2.4application propertiesgood application propertiesfree from sag, run, streaks, pinholes,cratersas/nzs 1580.205.1as/nzs 1580.205.2as/nzs 1580.205.3as/nzs 1580.205.4steel500 5002.4.5pot-lifesatisfactory sprayingas/nzs 1580.205.2 oras/nzs 1580.205.4steel500 5002.5.3scratch resistancewithstand a scratch load of 1.5 kgas/nzs 1580.403.1tinplate100 1502.5.4gloss (60-degree head)75 gloss unitsas/nzs 1580.602.2glass150 1002.5.5colourapproximate matchas/nzs 1580.601.1cardboard100 502.5.6finishuniform colour, free from wrinkling anddefectsas 1580.603.1steel500 5002.5.7flexibilityno cracking, damage or detachmentas 1580.402.1tinplate100 502.5.8hardnesshardness has/nzs 1580.405.1tinplate100 1502.5.9abrasion resistancemass loss 200 mgas 1580.403.2tinplate100 1002.5.10recoating propertiesno wrinkling, lifting, patchinessintercoat adhesion 1as 1580.408.2tinplate100 150resistance to mineral oil*7 days immersionas 1580.454.1steel150 100resistance to alkali*24 hours immersionsteel150 100resistance to hydraulic fluid*5 minutes immersionsteel150 100resistance to distillate*2 hours immersionsteel150 100resistance to unleaded petrol*2 hours immersionsteel150 1002.5.12resistance to weatheringas/nzs 1580.457.1as/nzs 1580.481.3table 2steel300 1502.5.13accelerated testsastm g154as/nzs 1580.481.1 series table 3steel300 75* not applicable to type 2 paints2.5.4 glosswhen one coat of test paint is applied to a test panel and air-dried for 24 h and evaluated in accordance with as/nzs 1580.602.2 using a 60-degree head, the specular gloss shall be more than 75 gloss units.2.5.5 colourwhen one coat of test paint is applied to a test panel, air-dried for a minimum of 24 h and assessed in accordance with as/