1、CEN ENS23270 91 W 3404589 002LL94 5 W EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 23270 August 199 1 DC 667.612 : 620.1 : 551.584 Descriptors: Paints, vainishes, raw materials, conditioning, temperature, test atmospheres, humidity English version Paints and varnishes and their raw materials
2、 - Temperatures and humidities for conditioning and testing (IS0 3270 : 1984) Peintures et vernis et leurs matires premires - Tkmpratures et humidits pour le conditionnement et 1? essai (IS0 3270 : 1984) Lacke, Anstrichstoffe und deren Rohstoffe - Tkmperaturen und Luftfeuchten fr Konditionierung und
3、 Prfung (IS0 3270 : 1984) This European Standard was approved by CEN on 5 August 1991. CEN members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists
4、and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat 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 responsi
5、bility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, fiance, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, P
6、ortugal, Spain, Sweden, Swit.zerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels O CEN 1991 Copyright reserved to all CEN members Ref. No. EN 23270 : 1991 E . CEN
7、 EN*23270 91 3404589 002LL95 7 = Page 2 EN 23270 : 1991 Foreword This European Standard is the endorsement of IS0 3270. Endorsement of IS0 3270 was recommended by CEN/TC 139, Paints and varnishes, under whose competence this European Standard will henceforward fall. National standards identical to t
8、his European Standard shall be published at the latest by 8 Februaiy 1992 and conflicting national standards shall be witlidram at the latest by 8 February 1992. The standard was approved and, in accordance with CENKENELEC Internal Regulations, the following countries are bound to implement this Eur
9、opean Standard: Austria, Belgium, Denmark, Finland, France, Geimany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Endorsenient notice The text of the Internat.iona1 Standard IS0 3290 : 1984 was approved by CEN as a Eur
10、opean Standard without any modification. CEN EN*232?0 3Li04587 002LLb Page 3 EN 23270 : 1991 Paints and varnishes and their raw materials - Temperatures and humidities for conditioning and testing O Introduction The physical and meclianical properties of paints, varnishes and their raw niaterials ar
11、e generally dependent on the test en- vironmental conditions, the most important variables being temperature and humidity. The degree to which each of these variables needs to be con- trolled is determined by the significance of the effect of the variable on the property being measured. Thus for mea
12、sure- ment of viscosity, refractive index and density, it is essential to specify and control the temperature of the test portion to much closer limits than those required for the conditioning and testing atmosphere (see the note to 4.21. It is recognized that many data on, for example, viscosity, f
13、low times and density have been determined, historically, at temperatures different from that specified in this International Standard. In order to preserve the validity of such data and since much laboratory apparatus (for example burettes, pipet- tes, pyknometers) is not calibrated at 23 OC, speci
14、fic deviation from this International Standard may be necessary. It is strongly recommended that in these cases physical data should also be determined at the conditions specified in this In- ternational Standard in order to facilitate a progressive move towards general adoption of the standard cond
15、itions at some future date. 1 Scope and field of application This International Standard specifies conditions of temperature and relative humidity for general use in the conditioning and testing of paints and varnishes and their raw materials. It is ap- plicable to paints and varnishes in liquid or
16、powder form, to wet or dry films, and their raw materials. 2 Reference IS0 558, Conditioning and testing - Standard atmospheres - Definitions. 3 Definitions (derived from IS0 5581 3.1 conditioning atmosphere : The atmosphere in which a sample or test piece is kept before being subjected to test. It
17、is characterized by specified values for either one or both parameters : temperature and relative humidity, which are kept within the prescribed tolerances for a given period of time. The selected values and period of time depend on the nature of the sample or tesf piece to be tested. NOTES 1 The te
18、rm “conditioning“ refers to the operation as a whole de- signed to bring a sample or test piece, before testing, into a specified condition in relation to temperature and humidity, by keeping it for a given period of time in the conditioning atmosphere. 2 The conditioning can be done either in the l
19、aboratory or in a special enclosure termed “the conditioning chamber“ or in the test chamber. 3.2 test atmosphere : The atmosphere to which a sample or test piece is exposed throughout the test. It is characterized by specified values for either one or both parameters : temperature and relative humi
20、dity, which are kept within the prescribed tolerances. NOTE - The test may be carried out either in the laboratory or in a special chamber termed “the test chamber“, or in the conditioning chamber, the choice depending on the nature of the sample or test piece and on the test itself. For example, cl
21、ose control of the test afmosphere may not be necessary if the change of properties of the sample or test piece is insignificant in the test period. CEN EN*Z3270 91 = 3404589 0021197 O M Page 4 EN 23270 : 1991 4 Temperatures and humidities for conditioning and testing 4.1 Standard conditions (to be
22、used whenever possible) 23 f 2 OC and 50 f 5 % relative humidity. 4.2 Standard temperature 23 f 2 OC and ambient relative humidity. NOTE - For some tests the limits for control of temperature are more strict. For example when determining viscosity or consistency, control limits of at most f 0,5 OC a
23、re recommended. 4.3 Other conditions 4.3.1 For countries where the standard conditions of 4.1 and 4.2 are difficult to maintain, and for other than referee pur- poses, other conditions may be specified, and these shall be noted in the test report. 4.3.2 Ambient conditions, where neither the temperat
24、ure nor relative humidity have to be controlled, but these conditions, if known, should be noted in the test report. 5 Conditioning 5.1 The period of conditioning shall be as specified in the par- ticular test method under consideration. 5.2 The products to be tested shall be placed in the con- diti
25、oning atmosphere so that they reach equilibrium with the atmosphere as soon as possible. The relevant parts of the apparatus shall also be placed in the conditioning atmosphere so that they reach equilibrium. The products shall be protected from direct sunlight and the atmosphere should be clean. Te
26、st panels shall be separated from each other and from the walls of the enclosure by a distance of at least 20 mm. 6 Testing Unless otherwise specified, the products shall be tested under the same conditions as those in which they have been condi- tioned. If the standard conditions, specified in 4.1,
27、 have been used for conditioning and testing, the test report shall state : Conditioned, for . h, and tested under the standard condi- tions conforming to IS0 3270. If the standard conditions specified in 4.1 have not been used, but other conditions have been chosen, the test report shall state those conditions.
