1、BRITISH STANDARD BS EN ISO 483:2005 Plastics Small enclosures for conditioning and testing using aqueous solutions to maintain the humidity at a constant value The European Standard EN ISO 483:2005 has the status of a British Standard ICS 83.200 BS EN ISO 483:2005 This British Standard was published
2、 under the authority of the Standards Policy and Strategy Committee on 23 January 2006 BSI 23 January 2006 ISBN 0 580 47185 3 National foreword This British Standard is the official English language version of EN ISO 483:2005. It is identical with ISO 483:2005. It supersedes BS EN ISO 483:1999 which
3、 is withdrawn The UK participation in its preparation was entrusted to Technical Committee PRI/21, Testing of plastics, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals
4、 for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international
5、or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to in
6、clude all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN ISO title page, the
7、 EN ISO foreword page, the ISO title page, pages ii to v, a blank page, pages 1 to 11 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCH
8、ENORM ENISO483 November2005 ICS83.200 SupersedesENISO483:1999 EnglishVersion PlasticsSmallenclosuresforconditioningandtestingusing aqueoussolutionstomaintainthehumidityataconstantvalue (ISO483:2005) PlastiquesPetitesenceintesdeconditionnementet dessaiutilisantdessolutionsaqueusespourmaintenir lhumid
9、itunevaleurconstante(ISO483:2005) KunststoffeKleineKammernfrdieKonditionierungund PrfungbeikonstanterLuftfeuchteberwssrigen Lsungen(ISO483:2005) ThisEuropeanStandardwasapprovedbyCENon4November2005. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthi
10、sEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheCentralSecretariatortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyother
11、languagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheCentralSecretariathasthesamestatusast heofficial versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,Cyprus,CzechRepublic,Denmark,Estonia,Finland,France, Germany,Greece,Hungary,Iceland,Irela
12、nd,Italy,Latvia,Lithuania,Luxembourg,Malta,Netherlands,Norway,Poland,Portugal, Slovakia, Slovenia,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2005CEN Allrightsofex
13、ploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.ENISO483:2005:E Foreword This document (EN ISO 483:2005) has been prepared by Technical Committee ISO/TC 61 “Plastics“ in collaboration with Technical Committee CEN/TC 249 “Plastics“, the secretariat of which is held by
14、IBN. 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 2006, and conflicting national standards shall be withdrawn at the latest by May 2006. This document supersedes EN ISO 483:1999. According
15、to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, L
16、uxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 483:2005 has been approved by CEN as EN ISO 483:2005 without any modifications. EN ISO 483:2005 Reference number ISO 483:2005(E)INTERNATIONAL
17、 STANDARD ISO 483 Second edition 2005-11-15 Plastics Small enclosures for conditioning and testing using aqueous solutions to maintain the humidity at a constant value Plastiques Petites enceintes de conditionnement et dessai utilisant des solutions aqueuses pour maintenir lhumidit une valeur consta
18、nte EN ISO 483:2005ii EN ISO 483:2005 iii Contents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references . 1 3 Principle. 1 4 Materials 2 5 Aqueous solutions 2 6 Apparatus 4 7 Procedure 4 7.1 General. 4 7.2 Method A: Using saturated aqueous salt solutions 5 7.3 Method B: Using aqueous g
19、lycerol solutions . 5 7.4 Method C: Using aqueous sulfuric acid solutions 6 8 Tolerances on standard atmospheres 7 8.1 General. 7 8.2 Normal tolerances. 7 8.3 Close tolerances . 7 9 Precision and bias 7 10 Test report . 8 Annex A (normative) General features of a conditioning enclosure with a volume
20、 of 15 dm 3to 200 dm 3 9 Bibliography . 11 EN ISO 483:2005 iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical comm
21、ittees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
22、International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft Internation
23、al Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be th
24、e subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 483 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 6, Ageing, chemical and environmental resistance. This second edition cancels and replaces the first edition (
25、ISO 483:1988), in which the values of the relative humidity above the saturated salt solutions have been corrected to the values given in Reference 1 (see the Bibliography) which are generally accepted as the most reliable values by national physical laboratories. v Introduction The properties of ma
26、ny plastics are strongly influenced by the relative humidity of the surrounding air. This International Standard describes small cabinets for conditioning and testing of specimens at constant temperature and constant relative humidity above aqueous solutions of salts, sulfuric acid and glycerol. EN
27、ISO 483:2005blank1 Plastics Small enclosures for conditioning and testing using aqueous solutions to maintain the humidity at a constant value 1 Scope This International Standard establishes guidelines for the construction and use of enclosures with volumes less than 200 dm 3 , in order to obtain at
28、mospheres of constant relative humidity at given temperatures, using saturated aqueous salt solutions, glycerol/water solutions or sulfuric acid/water solutions, for conditioning and testing plastics. It specifies the procedures to be followed to maintain the relative humidities of the conditioning
29、and testing atmospheres within the required tolerances, at the temperatures specified by particular International Standards. The procedures described are intended for conditioning small quantities of materials prior to test, and for such tests as may be carried out entirely within a small enclosure,
30、 e.g. electrical tests. The guidelines described do not apply to enclosures requiring frequent opening. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the
31、latest edition of the referenced document (including any amendments) applies. ISO 291, Plastics Standard atmospheres for conditioning and testing ISO 3696:1987, Water for analytical laboratory use Specification and test methods 3 Principle In a relatively small, closed container, aqueous solutions o
32、f specified concentration can be used to produce atmospheres with specific relative humidities under equilibrium conditions. Such atmospheres can be generated by using binary saturated aqueous salt solutions (see method A and Table 1), by using specific concentrations of aqueous glycerol solutions (
33、see method B and Table 2) or by using aqueous sulfuric acid solutions (see method C and Table 3). In the case of method B and method C, it is necessary to measure and control the concentrations of these solutions. Information is given concerning the methods of producing desired relative humidities i
34、n these enclosures at temperatures from 0 C to 70 C. The relative-humidity values indicated have been taken from the literature1 . The uncertainties involved are discussed in Clause 9. EN ISO 483:20052 4 Materials 4.1 Salts, of recognized analytical grade. 4.2 Glycerol, of reagent quality. 4.3 Sulfu
35、ric acid, of reagent quality. 4.4 Water, grade 3 as defined in ISO 3696:1987. NOTE The exact purity of the chemicals used when the original conditions were developed is not known, but any differences between those chemicals and reagent-grade chemicals are expected to be negligible. 5 Aqueous solutio
36、ns 5.1 Saturated aqueous salt solutions (see Table 1), with an excess of salt covered by the solution in order to keep the solution saturated. 5.2 Aqueous glycerol solutions (see Table 2), of specified concentrations. 5.3 Aqueous sulfuric acid solutions (see Table 3), of specified concentrations. Ta
37、ble 1 (for use with method A) Relative humidity of air over saturated aqueous salt solutions at temperatures between 5 C and 70 C Relative humidity (%) at temperature Saturated aqueous salt solution 5 C 10 C 15 C 20 C 25 C 30 C 35 C 40 C 50 C 60 C 70 C 1 Potassium hydroxide (KOH)a14 12 11 9 8 7 7 6
38、6 6 2 Lithium chloride (LiClxH 2 O)b11 11 11 11 11 11 11 11 11 11 3 Potassium acetate (CH 3 COOK) 23 23 23 23 22 4 Magnesium chloride hexahydrate (MgCl 2 6H 2 O)b34 34 33 33 33 32 32 32 31 29 5 Potassium carbonate dihydrate (K 2 CO 3 2H 2 O)b43 43 43 43 43 43 6 Magnesium nitrate hexahydrate Mg(NO 3
39、) 2 6H 2 Ob59 57 56 54 53 51 50 48 45 7 Sodium bromide (NaBr) 64 62 61 59 58 56 55 53 51 50 8 Potassium iodide (KI) 73 72 71 70 69 68 67 66 65 63 62 9 Sodium chloride (NaCl)b76 76 76 75 75 75 75 75 74 75 10 Ammonium sulfate (NH 4 ) 2 SO 4 b, c82 82 82 81 81 81 80 80 79 11 Potassium chloride (KCl) 88
40、 87 86 85 84 84 83 82 81 80 12 Potassium nitrate (KNO 3 )b96 96 95 95 94 92 91 89 85 13 Potassium sulfate (K 2 SO 4 ) 99 98 98 98 97 97 97 96 96 aPotassium hydroxide solution is corrosive and should not be allowed to come into contact with the skin. bThese salts are recommended for particular humidi
41、ty ranges because the change with temperature is very small over the range 20 C to 30 C. cAmmonium salts may cause corrosion of copper parts. EN ISO 483:20053 Table 2 (for use with method B) Relative humidity of air over aqueous glycerol solutions at temperatures between 0 C and 70 C Approximate gly
42、cerol concentration Refractive index at 25 C Relative humidity (%) at temperature % (by mass) 25 D n 0 C 25 C 50 C 70 C 10 1,346 3 98 98 98 98 20 1,356 0 96 96 96 97 25 1,360 2 95 95 96 96 35 1,377 3 89 90 91 91 45 1,390 5 84 85 86 87 52 1,401 5 79 80 81 82 58 1,410 9 74 75 76 77 64 1,419 1 69 70 71
43、 72 69 1,426 4 63 65 66 67 74 1,432 9 58 60 61 63 77 1,438 7 53 55 57 58 81 1,444 0 48 50 52 53 84,5 1,448 6 43 45 47 48 87,5 1,452 9 38 40 42 43 Table 3 (for use with method C) Relative humidity of air over aqueous sulfuric acid solutions at temperatures between 5 C and 50 C Sulfuric acid concentra
44、tion Density at 23 C Density at 25 C Relative humidity (%) at temperature % (by mass) g/cm 3g/cm 35 C 15 C 25 C 35 C 50 C 5 1,030 7 1,030 0 98 98 98 98 98 10 1,064 8 1,064 0 96 96 96 96 96 15 1,100 5 1,099 4 93 93 92 93 92 20 1,137 6 1,136 5 88 88 88 88 89 25 1,176 4 1,175 0 82 82 83 83 83 30 1,216
45、4 1,215 0 74 75 75 76 77 35 1,257 7 1,256 3 65 66 67 68 69 40 1,300 5 1,299 1 54 56 57 58 59 45 1,345 2 1,343 7 43 45 46 47 49 50 1,397 2 1,391 1 33 34 35 37 39 55 1,442 8 1,441 2 23 24 25 26 28 60 1,495 7 1,494 0 14 15 16 18 19 65 1,550 7 1,549 0 8 9 10 10 12 70 1,607 7 1,605 9 4 4 5 5 6 EN ISO 483
46、:20054 6 Apparatus 6.1 If the volume of the enclosure is less than 15 dm 3 , the enclosure shall be a container, of simple shape, with internal walls that are easily cleaned and are inert with regard to the solutions used. The temperature shall be kept constant and uniform by placing the enclosure i
47、n an oven, a water bath or a laboratory conditioned at constant temperature. Any oven or room in which the enclosure is placed shall be capable of maintaining the temperature to within 1 C. Place a thermometer that is capable of reading to 0,1 C inside the enclosure. Read the temperature 1 h after t
48、he chamber has been closed and at least once every 24 h thereafter. The temperatures recorded shall be within 1 C of the temperature set. Any temperatures recorded outside these limits shall be indicated in the test report. Air circulation is generally recommended, particularly when hygroscopic materials are being tested. Uniform relative humidity can only be obtained by using a fan with blades located just above the aqueous solution. If the enc
