《BS-EN-ISO-1600-1999.pdf》由会员分享，可在线阅读，更多相关《BS-EN-ISO-1600-1999.pdf（14页珍藏版）》请在三一文库上搜索。
1、BRITISH STANDARD BS EN ISO 1600:1999 Incorporating Amendment No. 1 to BS 2782-5: Method 553A:1991 (renumbers the BS as BS EN ISO 1600: 1999) Plastics Cellulose acetate Determination of light absorption on moulded specimens produced using different periods of heating IMPORTANT NOTE. Before reading th
2、is method it is essential to read BS 2782-0, Introduction, issued separately. The European Standard EN ISO 1600:1999 has the status of a British Standard ICS 83.080.20 BS EN ISO 1600:1999 This British Standard, having been prepared under the direction of the Plastics and Rubber Standards Policy Comm
3、ittee, was published under the authority of the Standards Board and comes into effect on 31 October 1991 BSI 04-2000 The following BSI references relate to the work on this standard: Committee reference PRM/21 Special announcement in BSI News, September 1991 ISBN 0 580 20072 8 Committees responsible
4、 for this British Standard The preparation of this British Standard was entrusted by the Plastics and Rubber Standards Policy Committee (PRM/-) to Technical Committee PRM/21, upon which the following bodies were represented: British Plastics Federation British Steel Industry British Telecommunicatio
5、ns plc British Textile Confederation Department of Trade and Industry (National Physical Laboratory) EEA (The Association of Electronics, Telecommunications and Business Equipment Industries) Electrical and Electronic Insulation Association (BEAMA Ltd.) Electrical Installation Equipment Manufacturer
6、s Association (BEAMA Ltd.) GAMBICA (BEAMA Ltd.) Ministry of Defence Packaging and Industrial Films Association PIRA Plastic Industrial Containers Association Plastics and Rubber Institute RAPRA Technology Ltd. Yarsley Technical Centre Ltd. Amendments issued since publication Amd. No.DateComments 106
7、00November 1999 Implementation of the European Standard BS EN ISO 1600:1999 BSI 04-2000i Contents Page Committees responsibleInside front cover National forewordii Foreword2 1Scope3 2Normative references3 3Principle3 4Reagents3 5Apparatus3 6Test sample4 7Procedure4 8Expression of results5 9Precision
8、5 10Test report5 Annex ZA (normative) Normative references to international publications with their relevant European publications7 Figure 1 Suitable mould6 Publication(s) referred toInside back cover BS EN ISO 1600:1999 ii BSI 04-2000 National foreword This British Standard is the English language
9、version of EN ISO 1600:1999. WARNING NOTE. This British Standard, which is identical with EN ISO 1600, does not necessarily detail all the precautions necessary to meet the requirements of the Health and Safety at Work etc. Act 1974. Attention should be paid to any appropriate safety precautions and
10、 the method should be operated only by trained personnel. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from le
11、gal obligations. Cross-references Publication referred toCorresponding British Standard ISO 585:1990BS EN ISO 585:1999 Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 8, an inside back cover and a back cover. This standard
12、has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 1600 May 1999 ICS 83.080.00 English version Plastics Cellulose acetate Determination of li
13、ght absorption on moulded specimens produced using different periods of heating (ISO 1600:1990) Plastiques Actate de cellulose Dtermination de labsorption de lumire sur prouvettes moules produites en utilisant diffrentes priodes de chauffage (ISO 1600:1990) Kunststoffe Celluloseacetat Bestimmung der
14、 Lichtabsorption an gepreten Probekrpern, hergestellt bei unterschiedlichen Erwrmungszeiten (ISO 1600:1990) This European Standard was approved by CEN on 16 April 1999. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European S
15、tandard the status of a national standard without any alteration. Up-to-date lists 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, Fren
16、ch, 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 Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Den
17、mark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36,
18、 B-1050 Brussels 1999 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1600:1999 E EN ISO 1600:1999 BSI 04-2000 2 Foreword The text of the International Standard from Technical Committee ISO/TC 61, Plastics, of the International Org
19、anization for Standardization (ISO) has been taken over as a European Standard by Technical Committee CEN/TC 249, Plastics, the Secretariat of which is held by IBN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement,
20、at the latest by November 1999, and conflicting national standards shall be withdrawn at the latest by November 1999. According to CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech
21、Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of the International Standard ISO 1600:1990 has been approved by CEN as a European Standard without
22、any modification. EN ISO 1600:1999 BSI 04-20003 WARNING The use of this International Standard may involve hazardous materials, operations and equipment. This standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this standar
23、d to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 1 Scope This International Standard specifies a method for the determination of light absorption of cellulose acetate, employing test specimens taken from two mouldings whic
24、h have been produced using different periods of heating. The aim is to provide quantitative measurements which are compatible with visual judgements of yellowness and lightness, and of changes in these properties after moulding. The determinations are carried out on cellulose acetate in plasticized
25、form rather than in solution, since a more reliable guide is thereby obtained to the performance of cellulose acetate in plastics materials. This method minimizes the effects of haze or imperfections in the specimens. This method is intended for cellulose acetate having an acetic acid yield of 54 %
26、2,5 %. It may also be applicable to other transparent plastics which are not strongly coloured and which can be moulded under the specified conditions. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International
27、 Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members
28、 of IEC and ISO maintain registers of currently valid International Standards. ISO 565:1990, Test sieves Metal wire cloth, perforated metal plate and electroformed sheet Nominal sizes of openings. ISO 585:1990, Plastics Unplasticized cellulose acetate Determination of moisture content1). 3 Principle
29、 The absorption of visible light by cellulose acetate is normally greatest at the blue end of the visible spectrum, and decreases continuously across the spectrum to the red end. Therefore two measurements of absorption, one at the red end and one at the blue end, are sufficient to characterize the
30、absorption of light by the material. For the determination of the initial optical density, specimens given the smallest practicable amount of heating are used. The optical densities are measured for blue light and for red light using specified colour filters, and the optical density at 25 mm thickne
31、ss is calculated as the “initial light absorption”. The “light absorption after further heating” is obtained by similar measurements on further specimens prepared using a longer period of heating during moulding. 4 Reagents During the determination, use only reagents of recognized analytical grade,
32、free from visible colour. 4.1 Dimethyl phthalate, analytical grade, 1,191 to 1,195, purity more than 99 % (m/m). 4.2 Triacetin 4.3 Ethyl lactate 4.4 Acetone SAFETY PRECAUTIONS Acetone is highly flammable. Keep the container in a well ventilated place and away from sources of ignition. Do not smoke.
33、Take precautionary measures against static discharges. 4.5 Propan-2-ol SAFETY PRECAUTIONS Propan-2-ol is highly flammable. Keep the container tightly closed and away from sources of ignition. Do not smoke. 5 Apparatus Ordinary laboratory apparatus, plus the following: 5.1 Hydraulic press, capable of
34、 exerting a pressure of at least 8 MN/m2 on the moulding surface, with means of heating to 200 C and with water cooling. 5.2 Mould (see Figure 1 for a suitable type), with polished surfaces substantially flat and parallel, to produce mouldings of thickness within the range 1,5 mm to 5 mm. A particul
35、ar thickness within this range may be specified. 1) To be published. d20 20 EN ISO 1600:1999 4 BSI 04-2000 5.3 Photoelectric absorptiometer, to measure optical density at wavelengths in the region of 440 nm at the blue end of the spectrum and 640 nm at the red end. The arrangement of test specimen a
36、nd photoelectric cell shall be such that all light emerging from the photoelectric cell side of the specimen at angles of up to 45 from the direction of the incident beam is received by the measuring system. An absorptiometer using a metal-filament lamp with filters having light transmission at 440
37、nm and 640 nm respectively (for example, with Chance O.B. 102) blue filters and Ilford 6082) red filters) is suitable. 5.4 Stainless-steel grinder, electrically operated. 5.5 Oven, capable of being thermostatically maintained at 60 C 2 C or 70 C 2 C. 6 Test sample 6.1 If proceeding in accordance wit
38、h 7.1.1 (first method of incorporating the plasticizer), the sample of cellulose acetate shall be in the form of powder passing entirely through a sieve of 710 4m mesh size (as defined in ISO 565); it shall be ground if necessary, avoiding excessive heating of the sample. If proceeding in accordance
39、 with 7.1.2 (second method of incorporating the plasticizer), the cellulose acetate need not be ground. 6.2 Determine the moisture content of the sample in accordance with ISO 585. 7 Procedure 7.1 Either of the methods described below may be used for the incorporation of plasticizer. 7.1.1 First met
40、hod Weigh into a glass bottle, to within 0,5 g, the quantity of the sample corresponding to 100 g of dry cellulose acetate. Into another glass bottle, weigh 45 g of dimethyl phthalate (4.1), to within 0,5 g. Slowly add the dimethyl phthalate to the cellulose acetate with constant stirring and contin
41、ue to stir for at least 5 min after all the dimethyl phthalate has been added. Proceed in accordance with 7.2 to 7.9. 7.1.2 Second method Place 200 g, weighed to the nearest 1 g, of the cellulose acetate in a 2 litre vessel. The moisture content of the sample shall be less than 0,5 %; if not, there
42、is a risk of bubbles forming in the moulding. Add about one-half of the following mixture: dimethyl phthalate (4.1); 75 ml 0,5 ml (90 g 0,6 g); propan-2-ol (4.5); 400 ml 0,5 ml. Homogenize by mixing briskly with a glass stirrer. Pour in the rest of the solvent/plasticizer mixture, and, after having
43、mixed again and stoppered the vessel, place it immediately on a roller mixer operating between 50 rpm and 70 rpm. After 2 h of mixing, tap the vessel with the palm of the hand in order to dislodge any powder which may have become stuck to the sides. Place on the roller mixer again and mix for a furt
44、her 4 h. Pour the product into a porcelain dish, cover with a sheet of filter paper and let it stand in the open, at room temperature, overnight. Then place in an oven, thermostatically maintained at 60 C 2 C, and leave for 3 h to eliminate part of the solvent. At the end of this time, place the pro
45、duct in the original clean vessel again. Homogenize it for one or two minutes, by rapid mixing with a mixing rod equipped with a blade turning at 10 000 rpm. (This operation is to destroy any agglomerates that may have been produced during the stoving.) Stopper the vessel, then let it stand again at
46、 room temperature for about 20 h. Proceed in accordance with 7.2 to 7.9. 7.2 Heat the mixed material for 2 h at 70 C 2 C to remove moisture and complete the absorption of plasticizer. 7.3 Place a suitable quantity of the heated mixture in the mould (5.2), pre-heated to a temperature of 200 C 2 C. Ap
47、ply contact pressure for 2 min, then full pressure (at least 8 MN/m2 at the moulding surface) for a further 10 min 0,5 min for a moulding 1,5 mm thick. This time shall be increased by 0,5 min for each 0,5 mm above 1,5 mm thickness. 7.4 Release the pressure and start cooling immediately, continuing t
48、he cooling until the moulding is rigid enough to be ejected without being deformed. The rate of cooling shall be such that the mould temperature 2 min after the start of cooling is at least 30 C below the moulding temperature. 7.5 Prepare a further moulding of the same thickness in a similar manner,
49、 but with a heating time, at full pressure, one-third of that used in 7.3. 2) Chance O.B. 10 and Ilford 608 are examples of suitable products available commercially. This information is given for the convenience of users of this International Standard and does not constitute an endorsement by ISO of these products. EN ISO 1600:1999 BSI 04-20005 7.6 For the measurement of the optical density, prepare two test specimens from each moulding as described in 7.7. 7.7 The test specimen thickness