BS EN 60811-511-2012 Electric and optical fibre cables Test methods for non-metallic materials Mechanical tests Measurement of the melt flow index of polyethylene compounds《电缆和光缆 非.pdf

1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationElectric and optical fibre cables Test methods for non-metallic materialsPart 511: Mechanical tests Measurement of the melt flow index of polyethylene compoundsBS EN 60811-511:20

2、12National forewordThis British Standard is the UK implementation of EN 60811-511:2012. It isidentical to IEC 60811-511:2012. In the UK, the relationship between the supersessions of BS EN 60811 seriescan be summarized as follows.Superseded standards are withdrawnThe UK participation in its preparat

3、ion was entrusted by Technical CommitteeGEL/20, Electric cables, to Subcommittee GEL/20/17, Electric Cables - Lowvoltage.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions of acont

4、ract. Users are responsible for its correct application. The British Standards Institution 2012Published by BSI Standards Limited 2012ISBN 978 0 580 65335 3ICS 29.035.01; 29.060.20Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published unde

5、r the authority of the StandardsPolicy and Strategy Committee on 31 July 2012.Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN 60811-511:2012BS EN 60811-100 together with Supersedes - -201, -202, -203, -501 BS EN 60811-1-1:1995 -301, -302, -411, -601, -602, -603, -

6、604 BS EN 60811-5-1:2000 -401, -412 BS EN 60811-1-2:1995 -402, -502, -503, -606 BS EN 60811-1-3:1995 -403, -404, -507 BS EN 60811-2-1:1998 -405, -409 BS EN 60811-3-2:1995 -406, -511, -605, -607 BS EN 60811-4-1:2004 -407, -408, -410, -510, -512, -513 BS EN 60811-4-2:2004 -504, -505, -506 BS EN 60811-

7、1-4:1995 -508, -509 BS EN 60811-3-1:1995EUROPEAN STANDARD EN 60811-511 NORME EUROPENNE EUROPISCHE NORM June 2012 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Management Centre: Avenue

8、Marnix 17, B - 1000 Brussels 2012 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60811-511:2012 E ICS 29.035.01; 29.060.20 Supersedes EN 60811-4-1:2004 (partially)English version Electric and optical fibre cables - Test methods f

9、or non-metallic materials - Part 511: Mechanical tests - Measurement of the melt flow index of polyethylene compounds (IEC 60811-511:2012) Cbles lectriques et fibres optiques - Mthodes dessai pour les matriaux non-mtalliques - Partie 511: Essais mcaniques - Mesure de lindice de fluidit chaud des mla

10、nges polythylne (CEI 60811-511:2012) Kabel, isolierte Leitungen und Glasfaserkabel - Prfverfahren fr nichtmetallene Werkstoffe - Teil 511: Mechanische Prfungen - Messung des Schmelzindex von Polyethylenmischungen (IEC 60811-511:2012) This European Standard was approved by CENELEC on 2012-04-17. CENE

11、LEC 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 obtained on a

12、pplication to the CEN-CENELEC Management Centre or to any CENELEC 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 CENELEC member into its own language and notified to the CEN

13、-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lith

14、uania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. EN 60811-511:2012 - 2 - Foreword The text of document 20/1307/FDIS, future edition 1 of IEC 60811-511, prepared by IEC/TC 20 “Electric cables“

15、was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 60811-511:2012. The following dates are fixed: latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2013-01-17 latest date by whi

16、ch the national standards conflicting with the document have to be withdrawn (dow) 2015-04-17 This document supersedes Clause 10 of EN 60811-4-1:2004 (partially). Full details of the replacements are shown in Annex A of EN 60811-100:2012. There are no specific technical changes with respect to EN 60

17、811-4-1:2004, but see the Foreword to EN 60811-100:2012. This standard is to be read in conjunction with EN 60811-100. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC and/or CEN shall not be held responsible for identifyin

18、g any or all such patent rights. This standard covers the Principle Elements of the Safety Objectives for Electrical Equipment Designed for Use within Certain Voltage Limits (LVD - 2006/95/EC). Endorsement notice The text of the International Standard IEC 60811-511:2012 was approved by CENELEC as a

19、European Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indicated: IEC 60811-4-1:2004 NOTE Harmonized as EN 60811-4-1:2004 (not modified). ISO 1133 series NOTE Harmonized as EN ISO 1133 series. BS EN 60811-511:2012

20、- 3 - EN 60811-511:2012 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, on

21、ly the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year

22、IEC 60811-100 2012 Electric and optical fibre cables - Test methods for non-metallic materials - Part 100: General EN 60811-100 2012 IEC 60811-606 - Electric and optical fibre cables - Test methods for non-metallic materials - Part 606: Physical tests - Methods for determining the density EN 60811-6

23、06 - BS EN 60811-511:2012 2 60811-511 IEC:2012 CONTENTS INTRODUCTION . 5 1 Scope . 6 2 Normative references . 6 3 Terms and definitions . 6 4 Test method . 6 4.1 General . 6 4.2 Apparatus 7 4.3 Test samples . 9 4.4 Cleaning and maintenance of the apparatus 9 4.5 Method A . 10 4.5.1 General . 10 4.5.

24、2 Test procedure 10 4.5.3 Expression of results . 10 4.6 Method B . 11 4.7 Method C 11 4.7.1 General . 11 4.7.2 Test procedure 11 4.7.3 Expression of results . 11 5 Test report 11 Bibliography 12 Figure 1 Apparatus for determining melt flow index 8 Figure 2 Die . 9 Table 1 Definition of types of pol

25、yethylene . 6 Table 2 Time intervals (as a function of melt flow index) used in obtaining cut-offs and mass of the charge put into the cylinder for methods A and C 11 BS EN 60811-511:201260811-511 IEC:2012 5 INTRODUCTION The IEC 60811 series specifies the test methods to be used for testing non-meta

26、llic materials of all types of cables. These test methods are intended to be referenced in standards for cable construction and for cable materials. NOTE 1 Non-metallic materials are typically used for insulating, sheathing, bedding, filling or taping within cables. NOTE 2 These test methods are acc

27、epted as basic and fundamental and have been developed and used over many years principally for the materials in all energy cables. They have also been widely accepted and used for other cables, in particular optical fibre cables, communication and control cables and cables for ships and offshore ap

28、plications. BS EN 60811-511:2012 6 60811-511 IEC:2012 ELECTRIC AND OPTICAL FIBRE CABLES TEST METHODS FOR NON-METALLIC MATERIALS Part 511: Mechanical tests Measurement of the melt flow index of polyethylene compounds 1 Scope This Part 511 of IEC 60811 describes the procedure for the measurement of th

29、e melt flow index for polyethylene compounds. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition o

30、f the referenced document (including any amendments) applies. IEC 60811-100:2012, Electric and optical fibre cables Test methods for non-metallic materials Part 100: General IEC 60811-606, Electric and optical fibre cables Test methods for non-metallic materials- Part 606: Physical tests Methods for

31、 determining the density 3 Terms and definitions For the purposes of this document, the terms and definitions given in IEC 60811-100 apply. Additionally, for the purposes of this standard, a distinction is made between low-density, medium-density and high-density PE as shown in Table 1. Table 1 Defi

32、nition of types of polyethylene Type of polyethylene Density at 23 C ag/cm3Low-density polyethylene 0,925 Medium-density polyethylene 0,925 0,940 High-density polyethylene 0,940 aThese densities refer to unfilled resins as determined by the method specified in IEC 60811-606. 4 Test method 4.1 Genera

33、l This part of IEC 60811 shall be used in conjunction with Part 100: General All the tests shall be carried out not less than 16 h after the extrusion of the insulating or sheathing compounds. BS EN 60811-511:201260811-511 IEC:2012 7 The melt flow index (MFI) of polyethylene and polyethylene compoun

34、ds is the quantity of material extruded in 1,5 min or 10 min at 190 C through a specified die under the action of a load determined by the method used. NOTE 1 The same method is also specified in ISO 1133. NOTE 2 The melt flow index is not applicable to flame retarding polyethylene. Flame retardant

35、PE is defined as PE containing additives intended to reduce flame propagation. 4.2 Apparatus The apparatus consists basically of an extrusion plastometer, the general design being as shown in Figure 1. The compound, which is contained in a vertical cylinder, is extruded through a die by a loaded pis

36、ton under controlled temperature conditions. All surfaces of the apparatus in contact with the material under test shall have a high polish. The apparatus consists of the following parts: a) Steel cylinder A steel cylinder fixed in a vertical position and thermally insulated for operation at 190 C.

37、The cylinder shall be at least 115 mm long with an internal diameter of between 9,5 mm and 10 mm and complying with the requirements in item b) below. The base of the cylinder shall be thermally insulated if the area of the exposed metal exceeds 4 cm2and it is recommended that the insulating materia

38、l used be polytetrafluoroethylene (thickness about 3 mm) in order to avoid the extruded material from sticking. b) Steel hollow piston A steel hollow piston with a length at least the same as that of the cylinder. The axes of the cylinder and of the piston shall coincide and the effective length of

39、the piston shall be a maximum of 135 mm. There is a head of length (6,35 0,10) mm. The diameter of the head shall be less than the internal diameter of the cylinder at all points along the working length of the cylinder by (0,075 0,015) mm. In addition, for calculating the load (see item c) this dia

40、meter should be known within 0,025 mm. The lower edge of the head shall have a radius of 0,4 mm and the upper edge has its sharp edge removed. Above the head, the piston has a diameter of about 9 mm. A stud may be added at the top of the piston to support the removable load, but the piston is therma

41、lly insulated from this load. c) Removable load on top of the piston The combined masses of the load and the piston shall be such that the force P applied is: P = 21,2 N in the case of method A (see 4.5); P = 49,1 N in the case of method C (see 4.7); d) Heater A heater to maintain the polyethylene i

42、n the cylinder at a temperature of (190 0,5) C. An automatic temperature control is strongly recommended. e) Temperature measuring device A temperature measuring device located as closely as possible to the die, but situated within the body of the cylinder. The measuring device shall be calibrated t

43、o permit temperature measurement to an accuracy of 0,1 C. f) Die A die of length (8,000 0,025) mm made of hardened steel, the mean internal diameter being between 2,090 mm and 2,100 mm and uniform along its length to within 0,005 mm (see Figure 2). The die shall not project beyond the base of the cy

44、linder. g) Balance A balance accurate to 0,000 5 g. BS EN 60811-511:2012 8 60811-511 IEC:2012 Dimensions in millimeters NOTE The figure shows the large external diameter cylinder, die-retaining plate A and insulating plate B. Key 1 guide collar Figure 1 Apparatus for determining melt flow index BS E

45、N 60811-511:201260811-511 IEC:2012 9 Dimensions in millimetres NOTE The figure shows the small external diameter cylinder with an example method of retaining the die. Figure 2 Die 4.3 Test samples A sample of insulation or sheath of sufficient mass shall be taken from one end of the cable or wire. T

46、he sample shall be cut in pieces, the dimension of which shall not exceed 3 mm in any direction. It is permitted to take material from different cores of the same cable. 4.4 Cleaning and maintenance of the apparatus The apparatus shall be cleaned after each test. On no account should abrasives or ma

47、terials likely to damage the surfaces of the piston, cylinder or die be used in removing superficial polyethylene or in manipulating any part of the apparatus. Suitable solvents for cleaning the apparatus are xylene, tetrahydronaphthalene or odourless kerosene. The piston shall be cleaned while stil

48、l hot with a cloth dipped in the solvent; likewise, the cylinder shall also be cleaned while still hot, with a swab dipped in the solvent. The die shall be cleaned with a closely-fitting brass reamer or wooden peg and then immersed in boiling solvent. BS EN 60811-511:2012 10 60811-511 IEC:2012 It is

49、 recommended that, at fairly frequent intervals, for example once a week for apparatus in constant use, the insulating plate and the die-retaining plate, if fitted (see Figure 1), be removed and the cylinder cleaned thoroughly. 4.5 Method A 4.5.1 General Method A is suitable for determining the melt flow index (MFI) of a sample of compound whose MFI is unknown. The MFI of a compound may be affected by previous thermal and mechanical treatment