1、STD*BSI BS EN IS0 Y577-ENGL 3999 LbZYbbS 0823233 OUT = BRITISH STANDARD Plastics - Polypropylene and propylene-copolymers - Determination of thermal oxidative stability in air - Oven Method The European Standard EN IS0 4577 :1999 has the status of a British Stcuidard ICs 83.080.20 5s EN IS0 C677:199
2、9 n-( n-m U-. NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGIW LAW u 1L.r National foreword been prepared under the direction of the Sector AmdNo. Committee for Materials and Chemicals, was pubiished under the authority of the Standards Committee and comes into effect on 15 Septemb
3、er 1999 O BSI 09-1999 This British Standard is the English language version of EN IS0 45771999. It is identical with IS0 4577: 1983. The UK participation in its preparation was entrusted to Technid Committee PRu21, Testing of Plastics, which has the responsibility to: Date Comments - aid enquirers t
4、o understand the tea - present to the responsible internationaVEuropean committee any enquiries on the interpretation, or proposals for change, and keep the UK interests iXlfOrlned, - monitor related international and European developments and promulgate them in the UK. A list of organizations repre
5、sented on this committee can be obtained on request to its secretary. Cross-references Attention is drawn to the fact that CEN ad CENELEC Standards normally include an annex which lists nonnative references to international publications with their corresponding European publications. The British Sta
6、ndards which implement international or European publications referred to in this document may be found in the BI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standa
7、rd does not purport to include all the necessary provisions of a contract. Users of British Standars are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a hnt cover, an i
8、nside front cover, the EN IS0 title page, the EN IS0 foreword page, the EO title page, the IS0 foreword page, pages 1 to 4, the annex ZA page and a back cover. The BSI copyright notice displayed in this document indicates when this document was iast issued. ISBN O 680 32870 8 EUROPEAN STANDARD NORME
9、 EUROPENNE EUROPISCHE NORM - STD-BSI BS EN IS0 4577-ENGL 1777 H Lb114bL7 08231135 782 II EN IS0 4577 June 1999 ICs 83.080.20 English version Plastics - Polypropylene and propylene-copolymers - Determination of thermal oxidative stability in air - Oven method (I SO 4577: 1 983) Plastiques - Polypropy
10、ine et copolymres de propylne - Dtermination de la Stabilit loxydation chaud dans lair - Mthode ltuve (IS0 45Ti:1983) Kunststoffe - Polypropyien und Propylen- b) air velocity: from 0,75 to 1 m/s at any oven position oc- cupied by the test specimens; cl temperature control : range up to 200 OC and wi
11、th con- trol throughout the working range to the nearest 1 OC. The temperature control shall include a device to prevent temperature overrides. It is recommended that a device be used for recording the temperature inside the oven. 1 I At present at the stage of draft. 1 STD-BSI BS EN IS0 4577-ENGL 1
12、999 I lL24bL9 0823240 24T M EN IS0 4577:1999 4.2 Thermometers, covering the temperature range up to 200 OC, graduated in 1 OC intervals or better. Each ther- mometer shall be tested for bulb stability and shall be calibrated at 150 OC. NOTE - In order to control the homogeneity of the temperature in
13、 the oven, it is recommended that at least two thermometers be used, one in the upper part of the working vdume of the oven, and one in the lower part. The test temperature is the mean value of the indications of the two thermometers. 4.3 Specimen holder. The specimen holder may be biaxially rotated
14、, uniaxially rotated or stationary, provided that the test specimens are in a stream of air having a relative velocity between 0,75 and 1 m/s. Illustrations of suitable apparatus for biaxially and uniaxially rotated specimen holders are shown in figures 1 and 2 respec- tively. Biaxial rotation incre
15、ases the probability that all specimens will be exposed similarly. In case of dispute, the use of biaxial rota- tion shall be the reference method. 4.3.1 Biaxially rotated specimen holder (see figure 11. The frequency of rotation about the horizontal and vertical axes shall be 1 to 3 min - 1. 4.3.2
16、Uniaxially rotated specimen holder (see figure 2). The drum peripheral velocity shall be such that the air stream impinges on the flat section of the test specimens at not more than 1 m/s. Figure 1 - Biaxially rotated specimen holder of the Ferris wheel type 2 STD-BSI BS EN IS0 4577-ENGL 1959 1tb24b
17、L7 08232YL lob II EN IS0 4577:1999 Figure 2 - Uniaxially rotated specimen holder - Drum rotator 3 STD-BSI BS EN IS0 4577-ENGL 1797 Iw Lh24bL9 OA232LiZ O12 EN IS0 4577:1999 4.4 Air velocity meter, non-directional, resistance wire type. 4.5 Die, to produce specimens of dimensions 50 mm x 10 mm from co
18、mpression moulded sheet. 4.6 Metal clips, lined with fluorocarbon film or other materials that have no adverse effect on the oxidative stability of propylene plastics. 5 Test specimens The test specimens shall be cut from compression moulded sheet prepared from granules or other homogeneous moulding
19、 material as described in IS0 1873/2. Specimens prepared by injection moulding or specimens cut from propylene plastics products may be used by agreement between the interested parties. The specimens shall be 10mm wide, 50 mm long and 1,0 f 0,05 mm thick. Edges shall be smoothed, if necessary, to re
20、move imperfections introduced by cutting. By agreement between the interested parties, specimens of other thicknesses may be used. At least five specimens shall be used for each test. 6 Conditioning In general, conditioning of specimens is not required. In case of dispute, the specimens shall be con
21、ditioned in one of the stan- dard atmospheres specified in IS0 291 for not less than 40 h. 7 Test conditions The recommended test temperature is 150 OC. During the course of the test it shall not vary more than f 1 OC, measured at a single location of the working space, or more than f 1,5 OC through
22、out the oven. In the event that the average time to failure at 150 OC is less than 7 days, the test report shall indicate “les than 7 days at 150 OC“ and the test shall be repeated at an oven temperature of 140 f 1 OC and, if necesary, at lower temperatures at inter- vals of 10 OC until time to fail
23、ure of 7 days is achieved. NOTE - If it is preferred to perform the test at 140 OC, even for materials lasting more than 7 days at 150 OC, this is permitted provided that this is stated in the test report. 8 Procedure WARNING - Handle specimens with caution to avoid contamination. 8.1 Attach the fiv
24、e specimens to the holder (4.3) by means of suitable metal clips (4.61, which, together with their linings, shall be cleaned beforehand with trichloroethylene or any other suitable solvent to remove all traces of oil. Place the specimens in the holder in the oven (4.1) such that the specimens are at
25、 least 30 mm apart and at least 50 mm from the walls of the oven, and start the rotation of the holder. 8.2 Inspect the specimens visually at least once per day for failure; during inspection, rotation of the hdder shall be stopped. NOTE - Visual inspection of the deterioration of the specimen sur-
26、face, as a reliable evaluation of oxidative ageing endurance, is justified by the fact that oxidation of propylene thermoplastics usually takes place on the surface of the material before propagating inward. For special research purposes or in cace of dispute, the oxidation may be followed by determ
27、ination of the viscosity number (see IS0 1191) andlor the melt flow rate (see IS0 1133) of the specimens at specified elapsed times of ageing. 9 Expression of results Report the time to failure, .e. the time, in days, after which visible indication of localized discoloration and crumbling ap- pears.
28、 The area within 5 mm of the clips shall not be included in this evaluation. 10 Test report The test report shall contain the following information : a) a reference to this International Standard; b) the complete identification of the sample; c) the average time to failure, in days at 150 OCl), of t
29、he five specimens: d) the range of times to failure, in days at 150 OCl), of the five specimens; e) the preparation or history of the specimen; f) the thickness of the specimen; g) the type of rotator; h) the test temperature, if other than 150 OC; j) details of conditioning (temperature and humidit
30、y, if appropriate (see clause 6). 1) at 140 OC (or at other temperatures used). If the time to failure is less than 7 days at 150 “C. report as “less than 7 days at 150 OC“ and in addition report the time (range of times) to failure 4 STD-BSI BS EN IS0 Li577-ENGL 1799 M LbZlibbl 08232Li3 T57 II EN I
31、S0 4577:1999 Annex ZA (normative) Normative references to international publications with their relevant European publications This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the
32、text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to app
33、lies. Publicatim W Jl& EN IS0 291 1997 Plastics - Standard atmospheres EN IS0 291 for conditioning and testing IS0 11 33 1997 Plastics - Determination of the melt mass-flow EN IS0 1133 rate (MFR) and the melt volume-flow rate (MVR) of thermoplastics IS0 1873-1 1995 Plastics - Polypropylene (PP) moul
34、ding and EN IS0 1873-1 extrusion materials - Part 1: Designation system and basis for specifications IS0 1873-2 1997 Plastics - Polypropylene (PP) moulding and EN IS0 1873-2 extrusion materials - Part 2: Preparation of test specimens and determination of properties yaar 1997 1999 1995 1997 BS EN IS0
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