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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS 7825 : Section3.8:1998
2、 ICS 83.200 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Calibration of rubber and plastics test equipment Part 3. Calibration schedules Section 3.8. Degradation and environmental properties Licensed Copy: London South Bank University, London South Bank University, Fri Dec
3、08 14:36:59 GMT+00:00 2006, Uncontrolled Copy, (c) BSI This British Standard, having been prepared under the direction of the Sector Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 June 1998 BSI 1998 The following BSI references
4、 relate to the work on this standard: Committee reference PRI/20 Draft for comment 94/307321 DC ISBN 0 580 28342 9 BS 7825 : Section 3.8 : 1998 Amendments issued since publication Amd. No.DateText affected Committees responsible for this British Standard The preparation of this British Standard was
5、entrusted to Technical Committee PRI/20, Accuracy of rubber and plastics test equipment, upon which the following bodies were represented: British Rubber Manufacturers Association Ltd. GAMBICA (BEAMA Ltd.) Ministry of Defence National Physical Laboratory RAPRATechnology Ltd. Licensed Copy: London So
6、uth Bank University, London South Bank University, Fri Dec 08 14:36:59 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 7825 : Section 3.8 : 1998 BSI 1998i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2Normative references1 3Definitions1 4Inspection1 5Schedules1 6Calibratio
7、n schedules for individual test methods2 Tables 1BS 2782 : Method 830A : 19864 2BS 2782 : Method 465A and 465B : 19794 3BS 2782 : Method 465C : 19905 4BS 903 : Part A19 : 19866 5BS EN ISO 846 : 19977 6BS EN ISO 899-2 : 19978 7BS ISO 1110 : 19958 8BS 7164 : Part 14 : 19969 9BS 903 : Part A43 : 199012
8、 10BS 903 : Part A44 : 199513 11BS 903 : Part A16 : 198715 12ISO 2230 : 197316 13BS 2782 : Method 821A : 197917 14BS 2782 : Method 135 : 199317 15BS 903 : Part A30 : 199618 16BS 903 : Part A32 : 198819 17ISO 4577 : 198320 18BS EN ISO 4599 : 199721 19BS 2782 : Method 833A to 833C : 199322 20BS 903 :
9、Part A52 : 198622 List of references24 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:36:59 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii BSI 1998 BS 7825 : Section 3.8 : 1998 Foreword This Section of BS 7825 has been prepared by Technical Committee PRI/20.
10、In commercial practice it is necessary for the parties concerned in the manufacture or supply of materials or products to operate or agree upon specified performance requirements. Those performance requirements are verified by standardized methods of test. Test result variability is influenced by bo
11、th test variability and product variability. As it is product variability which needs to be identified, test variability has to be kept to a minimum. An important element in the achievement of this reduced variability is the calibration of test instrumentation, to traceable standards, at acceptable
12、intervals. The use of this British Standard will encourage proper calibration and make it possible for all users and calibration laboratories to work to common procedures. BS 7825 comprises the following three separate Parts: Part 1Principles and general requirements Part 2Calibration procedures Par
13、t 3Calibration schedules Part 3 will comprise 13 Sections, each of which will provide calibration schedules for specific areas of rubber or plastics testing, as follows: Section 3.1Thermal properties Section 3.2Electrical properties Section 3.3Mechanical properties of plastics Section 3.4Mechanical
14、properties of rubber Section 3.5Optical and weathering properties Section 3.6Dimensional properties Section 3.7Rheological properties Section 3.8Degradation and environmental properties Section 3.9Flammability characteristics Section 3.10Conditioning, sample and test piece preparation Section 3.11Ru
15、bber polymer identification and chemical properties Section 3.12Chemical properties of plastics Section 3.13Chemical properties of resins A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct applicatio
16、n. 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, page i and ii, pages 1 to 24, an inside back cover and a back cover. Licensed Copy: London South Bank University, London Sou
17、th Bank University, Fri Dec 08 14:36:59 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BSI 19981 BS 7825 : Section 3.8 : 1998 1 Scope This Section of BS 7825 provides schedules for the calibration of a range of equipment and apparatus used for measuring the degenerative and environmental resistance prop
18、erties of plastics and rubber materials. 2 Normative references This Section of BS 7825 incorporates, by dated or undated reference, provisions from other publications. These normative references are made at the appropriate places in the text and the cited publications are listed on page 24. For dat
19、ed references, only the edition cited applies; any subsequent amendments to or revisions of the publications apply to this part of BS 7825 only when incorporated in the reference by amendment or revision. For undated references, the latest edition of the cited publication applies, together with any
20、amendments. 3 Definitions For the purposes of this Section of BS 7825 the definitions, where relevant, given in BS EN 30012-1, BS 5233, PD 6461 : Part 1, BS 4778 and ISO Guide 30 apply. 4 Inspection Before any calibration is undertaken, the condition of the items to be calibrated shall be ascertaine
21、d by inspection and recorded on any calibration report or certificate. It shall be reported whether calibration is made in the as-received condition or after rectification of any abnormality or fault. It shall be ascertained that the apparatus is generally fit for the intended purpose, including any
22、 requirements specified as approximate and hence not formally calibrated. If such parameters could change, then the need for periodic checks shall be written into the detailed calibration procedures. 5 Schedules The calibration schedules given in this Section of BS 7825 have been compiled by listing
23、 all of the parameters specified in the relevant test method cited, together with the specified requirement. A parameter and requirement may relate to the main test apparatus, part of that apparatus or to an ancillary apparatus necessary for the test. In some cases tolerances not given in the test m
24、ethod standard have been added. For each parameter a calibration procedure is indicated by reference to Part 2 of BS 7825, to another publication or to a procedure particular to that test method which is detailed. The verification frequency for each parameter is given by a code letter. The code lett
25、ers used in the schedules are: Procedure:PParticular procedure RUse of certified reference material CRequirement to be confirmed but no measurement Requirement:*Tolerance not specified in the test method standard Verification:NInitial verification only SStandard interval as given in Part 1 of BS 782
26、5 PParticular interval given in the standard UIn use In use checks additional to the schedule are listed separately. A list is given of reference materials either required by the calibration schedule or otherwise required by the test method. Reagents, including cleaning materials, are listed. In som
27、e cases a reagent may be considered as a particular type of reference material. In addition to the items listed, some standards assume the use of normal laboratory apparatus, e.g. timers, beakers etc. These may need calibrating in accordance with the appropriate procedure given in BS 7825 : Part 2.
28、Also, there may be items specified in the relevant cited standard which have a dimension, for example a 250 ml flask. Where the size has no particular significance, other than convenience of use, these items will not require to be calibrated. Most standards for the testing of materials require the t
29、est piece to be conditioned. This implies the use of a thermometer and possibly a hygrometer, both of which will require calibration. Conditioning and test temperatures and humidities cited in the relevant standard have not been repeated. Test piece dimensions are usually specified. This implies the
30、 use of dimensional measuring instruments which will require calibration. Test piece dimensions cited in the relevant standard have not been repeated. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:36:59 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 2 BSI 1998
31、BS 7825 : Section 3.8 : 1998 6 Calibration schedules for individual test methods The calibration schedules relating to this Section of BS 7825 are listed below in the numerical order of the international standard to which they relate: BS 2782 :Methods of testing plastics BS 2782 : Part 8 :Other prop
32、erties BS 2782 : Method 830A : 1986Determination of the effects of liquid chemicals, including water (Identical with ISO 175 : 1981) BS 2782 : Part 4 :Chemical properties BS 2782 : Methods 465A and 465B : 1979 Determination of loss of plasticizers (activated carbon method) (Identical with ISO 176 :
33、1976) BS 2782 : Method 465C : 1990Determination of migration of plasticizers (Identical with ISO 177 : 1988) BS 903 :Physical testing of rubber BS 903 : Part A19 : 1986Heat resistance and accelerated ageing tests (Identical with ISO 188 : 1982) BS EN ISO 846 : 1997Plastics. Evaluation of the action
34、of microorganisms (Identical with ISO 846 : 1997) BS EN ISO 899 :Plastics. Determination of creep behaviour BS EN ISO 899-2 : 1997Flexural creep by three-point loading (Identical with ISO 899-2 : 1993) BS ISO 1110 : 1995Plastics. Polyamides. Accelerated conditioning of test specimens (Identical with
35、 ISO 1110 : 1995) BS 7164 :Chemical tests for raw and vulcanized rubber BS 7164 : Part 14 : 1996Methods for determination of carbon black content (Identical with ISO 1408 : 1995) BS 903 :Physical testing of rubber BS 903 : Part A43 : 1990Method for determination of resistance to ozone cracking (stat
36、ic strain test) (IdenticalwithISO1431-1:1989) BS 903 : Part A44 : 1995Method of determination of resistance to ozone cracking (dynamic strain test) (IdenticalwithISO1431-2:1994) BS 903 : Part A16 : 1987Determination of the effect of liquids (Identical with ISO 1817 : 1985) ISO 2230 : 1973Vulcanized
37、rubber Guide to storage BS 2782 :Methods of testing plastics BS 2782 : Part 8 :Other properties BS 2782 : Method 821A : 1979Determination of the gas transmission rate of films and thin sheets under atmospheric pressure (manometric method) (Identical with ISO 2556 : 1974) BS 2782 : Part 1 :Thermal pr
38、operties BS 2782 : Method 135 : 1993Determination of the time-temperature limits after prolonged exposure to heat (Identical with ISO 2578 : 1993) Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:36:59 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BSI 19983 BS 78
39、25 : Section 3.8 : 1998 BS 903 :Physical testing of rubber BS 903 : Part A30 : 1996Determination of permeability to gases (Identical with ISO 2782 : 1995) BS 903 : Part A32 : 1988General directions for achieving elevated or subnormal temperatures for test purposes (Identical with ISO 3383 : 1985) IS
40、O 4577 : 1983Plastics Polypropylene and propylene-copolymers Determination of thermal oxidative stability in air Oven method BS EN ISO 4599 : 1997Plastics. Determination of resistance to environmental stress cracking (ESC). Bent strip method (Identical with ISO 4599 : 1986) BS 2782 :Methods of testi
41、ng plastics BS 2782 : Part 8 :Other properties BS 2782 : Methods 833A to 833C : 1993Determination of environmental stress cracking (ESC) by the constant tensile stress method (Identical with ISO 6252 : 1992) BS 903 :Physical testing of rubber BS 903 : Part A52 : 1986Determination of ageing character
42、istics by measurement of stress at a given elongation (Identical with ISO 6914 : 1985) Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:36:59 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 4 BSI 1998 BS 7825 : Section 3.8 : 1998 Table 1. BS 2782 : Method 830A : 19
43、86 (identical with ISO 175 : 1981) ParameterRequirementProcedureVerification frequency Notes Test temperature# 105 8C2 8C6S Balance 105 8C # (200 8C3 8C)11.1S Dial micrometer with flat anvils Accurate to 0.01 mm3.1S Calliper gaugeAccurate to 0.1 mm3.1S ReagentsThe reagents listed in table 2 shall be
44、 of laboratory reagent quality. Various dilutions are given but no tolerances. The reagents listed in table 3 are either to be in accordance with a standard (e.g. insulating oil in accordance with IEC 296) or the quality is to be specified (e.g. petrol (gasoline): quality to be specified) Table 2. B
45、S 2782 : Method 465A and 465B : 1979 (identical with ISO 176 : 1976) ParameterRequirementProcedureVerification frequency Notes Analytical balanceAccurate to 0.001 g11.1S Test temperature 1 8C in range 6S Bath or oven50 8C to 150 8C Cylindrical metal cages60 mm 6 mm 3.2 3.2 N N Gauze500 mm3.6N+ Refer
46、ence materialActivated carbon, well determined type and grade Details from the Secretariat of ISO TC 61 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 14:36:59 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BSI 19985 BS 7825 : Section 3.8 : 1998 Table 3. BS 2782 :
47、Method 465C : 1990 (identical with ISO 177 : 1988) ParameterRequirementProcedureVerification frequency Notes Analytical balanceAccurate to 0.001 g11.1S Thickness of backing discs $ 0.5 mm3.2U Diameter of backing discs 60 mm1 mm3.2U Mass of weights5 kg10 g* Test temperature 2 8C 6S Air circulating ov
48、enIn the range 50 8C to 100 8C 6See also clause 5 Size; and finish of glass plates 62 mm dia* Plane surface 3.2 3.5 N S Micrometer0.01 mm3.1S Reference materialsA standard rubber as in B.2 of ISO 4649 : 1995 Polyethylene without additive Polyvinyl acetate without plasticizer Absorbent backing discs
49、shall have an affinity for plasticizers Also, it is pointed out that if the absorbent discs themselves contain substances capable of migrating, then simultaneous migration from absorbent sheets to test pieces may occur as well as the migration being monitored. Similarly, constituents other than plasticizers may migrate (e.g. oligomers) from test pieces or volatile constituents may be lost from either the test pieces or the absorbent discs. All these factors will markedly affect the results. Licensed Copy: London South
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