1、BRITISH STANDARD BS ISO 4433-4:1997 BS2782-11: Method 1161D: 1998 Incorporating Corrigendum No.1 Thermoplastics pipes Resistance to liquid chemicals Classification Part 4: Poly(vinylidene fluoride) (PVDF) pipes ICS 23.040.20BSISO4433-4:1997 This British Standard, having been prepared under the direc
2、tionof the Sector Board for Materials and Chemicals, was published under the authority ofthe Standards Board and comesinto effect on 15 March1998 BSI 04-1999 ISBN 0 580 29135 9 National foreword This British Standard reproduces verbatim ISO4433-4:1997 and implements it as the UK national standard. T
3、his international standard is incorporated into BS2782 Methods of testing plastics:Part 11: Thermoplastics pipes, fittings and valves, as Method1161D, for association with related test methods for plastics materials and plastics piping components. The UK participation in its preparation was entruste
4、d to Technical Committee PRI/61, Plastics piping systems and components, 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 for change, and keep the UK interests informed
5、; 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 or European publications referred to in thi
6、s document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. WARNING NOTE. This British Standard, which is identical with ISO4433-4:1997, does not necessari
7、ly detail all the precautions necessary to meet the requirements of the Health and Safety at Work etc. Act1974. Attention should be paid to any appropriate safety precautions and the method should be operated only by trained personnel. A British Standard does not purport to include all the necessary
8、 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 legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, theISO title
9、 page, page ii, pages1 to6, an inside back cover and abackcover. This standard 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. Amendments issued since publication Amd. No. Date Comments 9996 Corr
10、No.1 April 1998 Indicated by a sideline in the marginBSISO4433-4:1997 BSI 04-1999 i Contents Page National foreword Inside front cover Foreword ii Introduction 1 1 Scope 1 2 Normative reference 1 3 Symbols 1 4 Principle 1 5 Determination of chemical resistance 1 6 Classification of chemical resistan
11、ce 5 7 Test report 5 Annex A (informative) Bibliography Inside back cover Figure 1 Classification diagram for PVDF pipes based on change in mass 3 Figure 2 Classification diagram for PVDF pipes based on percentage change in elastic modulus 4 Figure 3 Classification diagram for PVDF pipes based on th
12、e percentage change in tensile strength at break 5 Figure 4 Classification diagram for PVDF pipes based on the percentage change in elongation at break 6 Table 1 Determination of chemical resistance from the mean percentage change in mass Dm after112 days immersion 2 Table 2 Determination of chemica
13、l resistance from the mean percentage change in elastic modulus Q Eafter112 days immersion 3 Table 3 Determination of chemical resistance from the mean percentage change in tensile strength at break Q tbafter112 days immersion 4 Table 4 Determination of chemical resistance from the mean percentage c
14、hange in elongation at break Q (bafter112 days immersion 5ii blankBSISO4433-4:1997 ii BSI 04-1999 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 ca
15、rried out through ISO technical committees. 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
16、. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires
17、approval by at least75% of the member bodies casting a vote. International Standard ISO4433-4 was prepared by Technical Committee ISO/TC138, Plastics pipes, fittings and valves for the transport of fluids, Subcommittee SC3, Plastics pipes and fittings for industrial applications. Together with the o
18、ther parts (see below), this part of ISO4433 cancels and replaces ISO4433:1984, which has been technically revised. ISO4433 consists of the following parts, under the general title Thermoplastics pipes Resistance to chemical fluids Classification: Part 1: Immersion test method; Part 2: Polyolefin pi
19、pes; Part 3: Unplasticized poly(vinyl chloride) (PVC-U), high-impact poly(vinylchloride) (PVC-HI) and chlorinated poly(vinyl chloride) (PVC-C) pipes; Part 4: Poly(vinylidene fluoride) (PVDF) pipes. Annex A of this part of ISO4433 is for information only. Descriptors: Pipes (tubes), thermoplastic res
20、ins, polyvinylidene fluoride, plastic tubes, tests, determination, chemical resistance, classification.BSISO4433-4:1997 BSI 04-1999 1 Introduction This part of ISO4433 gives a system for preliminary classification of the chemical resistance of PVDFpipes. The method is based on the change in mass and
21、 changes in tensile properties resulting from immersion of test specimens taken from the walls of PVDF pipes in the liquid to be conveyed, in the absence of pressure. If the pipes are to be used under stress, for example for conveying liquids under pressure, the method only allows incompatibilities
22、between the liquid and the material to be detected; a “satisfactory” or “limited” result needs to be confirmed by subsequent tests using ISO8584-1 1and ISO/TR8584-2 2(seeAnnex A). NOTE 1If pertinent to the proposed application, consideration should be given to whether particular liquids permeate the
23、 pipe wall. NOTE 2The possibility of a build-up of electrostatic charge in pipes during use should also be considered. 1 Scope The method of classification given in this part of ISO4433 serves to determine the chemical resistance of poly(vinylidene fluoride) PVDF pipes designed for the conveyance of
24、 liquids in the absence of pressure and stress (e.g.due to earth loads or traffic loads, dynamic or internal stresses). To determine the chemical resistance, the method uses the change in mass and the changes in tensile properties which result from the immersion of test pieces, taken from such pipes
25、, in liquid chemicals. The immersion test is carried out in accordance with ISO4433-1. This part of ISO4433 is also applicable to PVDF sheets as appropriate. 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this part of
26、ISO4433. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this part of ISO4433 are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. Members of IEC and I
27、SO maintain registers of currently valid International Standards. ISO4433-1:1997, Thermoplastics pipes Resistance to liquid chemicals Classification Part1: Immersion test method. 3 Symbols The following symbols are used to designate the behaviour of pipes in contact with liquid chemicals: “S”: satis
28、factory resistance The pipes can be used for applications where there is no pressure or other stress; for applications where there is pressure, the final evaluation needs to be based on a subsequent test under pressure. “L”: limited resistance The pipes can be used for applications where there is no
29、 pressure or other stress, but a certain amount of change in properties due to the chemical can be accepted; for applications where there is pressure, the final evaluation needs to be based on a subsequent test under pressure. “NS”: non-satisfactory resistance The pipes are severely attacked: they a
30、re unsuitable used for either pressure or non-pressure applications; there is no purpose in conducting tests under pressure as the results would certainly be unfavourable. 4 Principle The behaviour of a pipe material under the influence of the liquid to be conveyed is determined by immersion of test
31、 pieces, taken from the pipe wall, in the liquid at ambient pressure. Immersion tests in accordance with ISO4433-1 give changes in mass and tensile properties in comparison with non-immersed pieces. These changes depend, in general, on the immersion time and the immersion temperature. This part of I
32、SO4433 establishes limits for permissible variations in properties at the test temperature in the absence of stress and classifies the measured performance by one of three designations (see clause3). 5 Determination of chemical resistance 5.1 Change in mass Determine the change in mass in accordance
33、 with ISO4433-1. Calculate the percentage change in mass of each test piece using the equation where m 1 is the initial mass of the test piece (beforeimmersion); m 2 is the mass of the test piece after immersion.BSISO4433-4:1997 2 BSI 04-1999 Compare the arithmetic meanof the percentage change in ma
34、ss at an immersion time of112 days with the limits given in Table 1. Plot thevalues from all the different immersion times on the classification diagram shown in Figure 1. Plotas a function of the square root of the time. From Table 1 and Figure 1, determine the classification of the pipe material o
35、n the basis of the change in mass. In particular, in the case of saturation (seeISO4433-1:1997, AnnexB, curves No.4 and No.7) and if the immersion time is shorter than112 days, use the diagrams with limit lines as given in Figure 1 to Figure 4. If saturation or equilibrium is not reached after112 da
36、ys, classify the pipe material “NS”. 5.2 Change in elastic modulus Determine the change in elastic modulus by immersion testing in accordance with ISO4433-1. Calculate the elastic modulus of each test piece using the equation given in ISO4433-1:1997, subclause9.5. Calculate the mean percentage chang
37、e Q Ein the elastic modulus using the following equation: where Compare the calculated Q Evalue at an immersion time of112 days with the limits given in Table 2. Plot the Q Evalues from all the different immersion times on the classification diagram shown in Figure 2. Plot lg Q Eas a function of the
38、 lg of the immersion time. From Table 2 and Figure 2, determine the classification of the pipe material on the basis of the change in elastic modulus. 5.3 Change in tensile strength at break Determine the change in tensile strength at break by immersion testing in accordance with ISO4433-1. Calculat
39、e the tensile strength at break of each test piece using the equation given in ISO4433-1:1997, subclause9.6. Calculate the mean percentage change Q tbin the tensile strength at break using the following equation: where Compare the calculated Q tbvalue at an immersion time of112 days with the limits
40、given in Table 3. Plot the Q tbvalues from all the different immersion times on the classification diagram shown in Figure 3. Plot lg Q tbas a function of the lg of the immersion time. From Table 3 and Figure 3, determine the classification of the pipe material on the basis of the change in tensile
41、strength at break. Table 1 Determination of chemical resistance from the mean percentage change in mass %m after112 days immersion is the arithmetic mean of the elastic modulus before immersion; is the arithmetic mean of the elastic modulus after immersion. %m %m %m E 0 E M is the arithmetic mean of
42、 the tensile strength at break before immersion; is the arithmetic mean of the tensile strength at break after immersion. tb0 tbM Pipe material Limits of the permissible values of % Satisfactory resistance S Limited resistance L Non-satisfactory resistance NS PVDF 0,810 0,8 2 2 %m %m %m %m %m %mBSIS
43、O4433-4:1997 BSI 04-1999 3 Table 2 Determination of chemical resistance from the mean percentage change in elasticmodulus Q Eafter112 days immersion Figure 1 Classification diagram for PVDF pipes based on change in mass Pipe material Limits of the permissible values of Q E % Satisfactory resistance
44、S Limited resistance L Non-satisfactory resistance NS PVDF Q E 43 43 Q E 30 Q E30BSISO4433-4:1997 4 BSI 04-1999 Table 3 Determination of chemical resistance from the mean percentage change in tensile strength at break Q tbafter112 days immersion 5.4 Change in elongation at break Determine the elonga
45、tion at break by immersion testing in accordance with ISO4433-1. Calculate the elongation at break of each test piece using the equation given in ISO4433-1:1997, subclause9.7. Calculate the mean percentage change Q bin the elongation at break using the following equation: where Compare the calculate
46、d Q bvalue at an immersion time of112 days with the limits given in Table 4. Plot the Q bvalues from all the different immersion times on the classification diagram shown in Figure 4. Plot lg Q bas a function of the lg of the immersion time. From Table 4 and Figure 4, determine the classification of
47、 the pipe material on the basis of the change in elongation at break. Figure 2 Classification diagram for PVDF pipes based on percentage change in elastic modulus Pipe material Limits of the permissible values of Q tb % Satisfactory resistance S Limited resistance L Non-satisfactory resistance NS PV
48、DF Q tb 80 80 Q tb 46 Q tb46 is the arithmetic mean of the elongation at break before immersion; is the arithmetic mean of the elongation at break after immersion. b0 bMBSISO4433-4:1997 BSI 04-1999 5 Table 4 Determination of chemical resistance from the mean percentage change in elongation at break
49、Q bafter112 days immersion 6 Classification of the chemical resistance List the individual determinations of,Q E , Q tband Q (b . Take as the final classification the lower ofand Q (b . NOTEThe strength at break is not of major interest to the design of pipes, which are used at stresses much lower than the yield point. 7 Test report The test report shall include the following information: a) a reference to this part of ISO4433; b) all details necessary for complete identification of the pipe
