1、BRITISH STANDARDBS EN ISO8130-8:2010Coating powders Part 8: Assessment ofthe storage stability of thermosetting powders (ISO 8130-8:1994) Incorporating corrigendum April 2011ICS 87.040National forewordThis British Standard is the UK implementation of EN ISO 8130-8:2010. It is identical to ISO 8130-8
2、:1994. It supersedes BS 3900-J4:1995 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee STI/10, Test methods for paints.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to
3、include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.BS EN ISO 8130-8:2010This British Standard, having been prepared under the direction of the Materials and, Chemicals
4、Sector Board (I/-), was published under the authority of the Standards Board and comes into effect on 15 February 1995 BSI 2011The following BSI references relate to the work on this standard: Committee reference STI/10 Draft for comment 92/57007 DCAmendments/corrigenda issued since publicationDate
5、Comments 30 April 2011 This corigendum renumbers BS 390-J4:195 as BS EN ISO 8130-8:2010ISBN 978 0 580 72116 8EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 8130-8 November 2010 ICS 87.040 English Version Coating powders - Part 8: Assessment of the storage stability of thermosetting powders
6、 (ISO 8130-8:1994) Poudres pour revtement - Partie 8: Estimation de la stabilit au stockage des poudres thermodurcissables (ISO 8130-8:1994) Pulverlacke - Teil 8: Beurteilung der Lagerbestndigkeit von wrmehrtenden Pulverlacken (ISO 8130-8:1994) This European Standard was approved by CEN on 16 Octobe
7、r 2010. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtai
8、ned on application to the CEN Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN Managem
9、ent Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlan
10、ds, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2010 CEN All rights of exploitation in a
11、ny form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 8130-8:2010: EForeword The text of ISO 8130-8:1994 has been prepared by Technical Committee ISO/TC 35 “Paints and varnishes” of the International Organization for Standardization (ISO) and has been taken over as EN
12、 ISO 8130-8:2010 by Technical Committee CEN/TC 139 “Paints and varnishes” the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by May 2011, and conflicting nationa
13、l standards shall be withdrawn at the latest by May 2011. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. According to the CEN/CENELEC
14、 Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
15、Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 8130-8:1994 has been approved by CEN as a EN ISO 8130-8:2010 without any modification. BS EN ISO 8130-8:2010EN ISO 8130-8:2010
16、(E) BSI 2011 1IntroductionCoating powders are subject to two distinct ageing mechanisms: one involving the physical state of the powder and the other its chemical reactivity. Changes in the coating powder may lead to deterioration in the physical and chemical properties of the final coating.This par
17、t of ISO8130 describes the procedures to be adopted in assessing the tendency of a thermosetting coating powder to maintain its physical and chemical integrity after being subjected to defined storage conditions.1 ScopeThis part of ISO8130 deals with the estimation of the storage stability of thermo
18、setting coating powders. It specifies the procedures for determining the changes both in the physical state of a thermosetting coating powder and in the chemical reactivity of the powder, together with its capacity to form a satisfactory final coating. A correlation between changes in different prop
19、erties is not to be expected. Similarly, there may be no correlation between the results obtained under different storage conditions.The results of the procedures specified in this part of ISO8130 give an indication of the ability of the coating powder to withstand the effects of storage prior to ap
20、plication.2 Normative referencesThe following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO8130. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on th
21、is part of ISO8130 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards.ISO1514:1993, Paints and varnishes Standard panels for testing. ISO2808:1991, P
22、aints and varnishes Determination of film thickness. ISO2813:1994, Paints and varnishes Determination of specular gloss of non-metallic paint films at20 degrees,60 degrees and85 degrees. ISO3270:1984, Paints and varnishes and their raw materials Temperatures and humidities for conditioning and testi
23、ng. ISO6272:1993, Paints and varnishes Falling-weight test. ISO8130-6:1992, Coating powders Part6:Determination of gel time of thermosetting coating powders at a given temperature. ISO8130-9:1992, Coating powders Part9:Sampling. 3 PrincipleThe thermosetting coating powder is subjected to artificial
24、storage conditions for a specified period of time at a defined temperature. Subsequently, any change in the ability of the powder to flow freely and its tendency to agglomerate or to cake according to a given rating scheme is noted. Any change in the ability of the powder to react chemically and to
25、form a satisfactory final coating is then assessed.Conditions at the bottom of the container may be simulated by placing a weightpiece on the test portion.NOTE 1The demonstration that one property of the material has deteriorated to an extent that it is unsatisfactory may make further tests unnecess
26、ary.4 Required supplementary informationFor any particular application, the test method specified in this part of ISO8130 needs to be completed by supplementary information. The items of supplementary information are given inAnnex A.5 Apparatus5.1 Air-circulating oven, capable of being maintained at
27、(30 0,5)C or(40 0,5)C.A water bath may also be used, but the samples shall be carefully sealed to protect against the ingress of water.5.2 Test tubes, of glass, nominally200mm long and40mm external diameter.5.3 Test-tube stoppers5.4 Test-tube stand that does not impede air (or water) circulation.5.5
28、 Standard loads, of mass(100 1)g.NOTE 2A length of steel rod of diameter sufficient to fit closely within the test tubes(5.2) but without touching the sides is suitable.5.6 Aluminium-foil discs, of diameter sufficient to fit closely within the test tubes(5.2) but without touching the sides.5.7 Balan
29、ce, capable of weighing100g to within0,1g.5.8 Test panels, as described inAnnex B.BS EN ISO 8130-8:2010EN ISO 8130-8:2010 (E)2 BSI 20116 SamplingTake a representative sample of the product to be tested, as described in ISO8130-9.7 Procedure7.1 Preliminary examination7.1.1 Determination of initial ch
30、emical reactivity of the powderDetermine the gel time of the sample in accordance with ISO8130-6 at the temperature specified for the product under test and record the results.7.1.2 Determination of initial physical and chemical properties of the coatingPrepare and coat at least three test panels(5.
31、8), as described inAnnex B. Discard any test panels where the coating shows signs of pinholing, cratering or cracking. Retain one of the coated test panels for use when comparing the coating made (see7.3.3) after the artificial-storage treatment of the product (see7.2). Determine the specular gloss
32、of the coating on two of the remaining panels at an angle of20,60 or85 depending on the gloss level of the coating, by the procedure described in ISO2813. Then determine the resistance of the coating to deformation by falling weight using two of the remaining panels and an agreed procedure from ISO6
33、272.If agreed between the interested parties, other tests may be specified to establish the initial properties of the product under test.7.2 Artificial-storage treatment7.2.1 Unless otherwise agreed, the temperature and respective times at which the product is maintained prior to assessment of its s
34、torage stability shall be as follows:a) (30 1)C for7 days,28 days and2 months orb) (40 1)C for24h,7 days and28 days.7.2.2 Check that the product under test is not agglomerated and, if necessary, pass it through a sieve of appropriate aperture to disperse the sample into its constituent particles.7.2
35、.3 For each artificial-storage condition(7.2.1) carry out the procedure in triplicate. Weigh(100 1)g of the sample into a test tube(5.2). Holding the test tube vertically, gently tap the bottom on a firm surface to ensure that the powder is not loosely packed. The simulation of conditions at the bot
36、tom of a container, if agreed, shall be achieved by application of a standard load(5.5) on an aluminium-foil disc(5.6). If it is agreed not to carry out this procedure, a note to this effect shall be included in the test report. If appropriate, place the aluminium-foil disc carefully on the surface
37、of the test portion and then gently place one of the standard loads on the disc. Stopper the test tube securely and place the tube in the test-tube stand(5.4).Transfer the stand and tubes to the oven(5.1), previously set to the specified test temperature. Leave for the specified period of time. Remo
38、ve the stand and tubes and allow to cool to(23 2)C for at least two hours.7.3 Final examination7.3.1 Change in physical appearance of the powderTurn the first test tube into a horizontal position, remove the stopper, gently tap the end containing the coating powder and note whether the coating powde
39、r flows freely.Tip the coating powder on to a clean surface and note any evidence of compaction or agglomeration. Record the findings in accordance withTable 1.Repeat for the other two test tubes. Combine the three test portions and mix thoroughly.7.3.2 Determination of chemical reactivity of the po
40、wderDetermine, in duplicate, the gel time on a test portion of the combined test sample, following the procedure described in7.1.1. Record the results.7.3.3 Determination of physical and chemical properties of the coatingPrepare and coat test panels(5.8) as described inAnnex B and carry out the test
41、s as described in7.1.2.Compare the appearance of the coatings made from the treated coating powder with that of the retained coated test panel (see7.1.2).If additional tests have been carried out on the initial sample (see7.1.2, last paragraph), carry out equivalent tests on the artificially stored
42、samples.BS EN ISO 8130-8:2010EN ISO 8130-8:2010 (E) BSI 2011Table 1 Assessment of the coating powder8 Expression of results8.1 Check that the degree of compaction and agglomeration (see7.3.1) of the three test portions agrees to within one rating unit.If the results differ by more than this limit, r
43、epeat the tests on a fresh test portion.Report the arithmetic mean of the results to within half a rating unit (i.e.0,5;1,5;2,5).8.2 Calculate the percentage change in reactivity (i.e.gel time), c, using the equation:where Report the results to the nearest integer.8.3 Report any difference in the ap
44、pearance of the coating produced from the treated coating powder (see7.3.3) when compared with the coating produced from the untreated coating powder (see7.1.2).8.4 Report any difference in mean specular gloss and resistance to deformation by falling weight of the coating produced from the treated c
45、oating powder(7.3.3) when compared with that from the untreated coating powder(7.1.2).8.5 Report any difference in the mean results of any other tests of the coating produced from the treated coating powder (see7.3.3, last paragraph) when compared with that from the untreated coating powder (see7.1.
46、2, last paragraph).9 PrecisionNo precision data are currently available.10 Test reportThe test report shall contain at least the following information:a) all details necessary to identify the product tested;b) a reference to this part of ISO8130(ISO8130-8);c) the items of supplementary information r
47、eferred to inAnnex A;d) a reference to the international or national standard, product specification or other document supplying the information referred to inc) above;e) whether any pretreatment of the sample (i.e.sieving) was used;f) the results of the tests as indicated in clause8;g) any deviatio
48、n from the test methods specified;h) the date of each test.Rating Extent of compaction or agglomeration0 No change.1Slight evidence of compaction. Agglomerates of powder can easily be broken down.2Significant compaction such that some effort is required to disperse the coating powder. Agglomerates a
49、re capable of being broken down by application of hand pressure.3aConsiderable compaction such that it is difficult or impossible to disperse the coating powder. Agglomerates are very stable such as to require the use of mechanical energy to break them down.a If a product is recorded at rating3, the need for further testing should be assessed as the coating powder is unlikely to be satisfactory in use.t0 is the mean initial gel time, in seconds, of the sample;t1 is the mean gel time, in seconds, of the sample after the artificial-storage treatm
