1、BRITISH STANDARD BS 771:1992 ISO 800:1992 Specification for Phenolic moulding materials UDC 678.632.072BS771:1992 This British Standard, having been prepared under the directionof the Plastics and Rubber Standards Policy Committee, was published underthe authority of the Standards Board and comes in
2、toeffect on 15November1992 BSI 03-1999 The following BSI references relate to the work on this standard: Committee reference PRM/40 Draft for comment 86/40314 DC ISBN 0 580 21391 9 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Plastics
3、 and Rubber Standards Policy Committee (PRM/-) to Technical Committee PRM/40, upon which the following bodies were represented: BEAMA Ltd. British Plastics Federation EEA (the Association of Electronics, Telecommunications and Business Equipment Industries) Electrical Installation Equipment Manufact
4、urers Association (BEAMA Ltd.) European Resin Manufacturers Association Ministry of Defence Amendments issued since publication Amd. No. Date CommentsBS771:1992 BSI 03-1999 i Contents Page Committees responsible Inside front cover National foreword ii 1 Scope 1 2 Normative references 1 3 Definitions
5、 2 4 Requirements 2 5 Test specimens 2 6 Methods of test 3 7 Marking 4 Table 1 Classification of phenolic moulding materials 1 Table 2 Limits on properties of phenolic moulding materials 5 List of references Inside back coverBS771:1992 ii BSI 03-1999 National foreword This British Standard has been
6、prepared under the direction of the Plastics and Rubber Standards Policy Committee and is identical with ISO800:1992 Plastics Phenolic moulding materials Specification, published by the International Organization for Standardization (ISO). It supersedes BS771-1:1980 and BS771-2:1980which are withdra
7、wn. Cross-references International standard Corresponding British Standard BS2782 Methods of testing plastics ISO62:1980 Methods 430A to 430D:1983 Determination of water absorption at23C. Determination of water absorption at23C with allowance for water-soluble matter. Determination of boiling water
8、absorption. Determination of boiling water absorption with allowance for water-soluble matter (Identical) ISO75:1987 Methods 121A and 121B:1991 Determination of temperature of deflection of plastics under a bending stress (Identical) ISO120:1977 Method 451D:1978 Determination of free ammonia and amm
9、onium compounds in phenol-formaldehyde mouldings (colorimetric comparison method) (Identical) ISO171:1980 Method 621C:1983 Determination of the bulk factor of moulding materials (Identical) ISO178:1975 Method 335A:1978 Determination of flexural properties of rigid plastics (Identical) ISO179:1982 Me
10、thod 359:1984 Determination of Charpy impact strength of rigid materials (Charpy impact flexural test) (Identical) ISO180:1982 Method 350:1984 Determination of Izod impact strength of rigid materials (Identical) ISO291:1977 Part 0:1992 Introduction (Annex A is identical) ISO295:1991 Method 902A:1992
11、 Plastics Compression moulding of test specimens of thermosetting materials (Identical) ISO308:1981 Method 451C:1978 Determination of acetone-soluble matter (resin content of the material in the unmoulded state) of phenolic moulding materials (Technically equivalent) ISO1183:1987 Method 620A to 620D
12、:1991 Determination of density and relative density of non-cellular plastics (Identical) IEC112:1979 BS 5901:1980 Method of test for determining the comparative and the proof tracking indices of solid insulating materials under moist conditions (Identical)BS771:1992 BSI 03-1999 iii The Technical Com
13、mittee has reviewed the provisions of ISO181, ISO2577, ISO2818, IEC167, IEC243-1, IEC250 and IEC296, to which normative reference is made in the text, and has decided that they are acceptable for use in conjunction with this standard. A British Standard does not purport to include all the necessary
14、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, pages i to iv, pages1to 6,
15、an inside back cover and a back cover. 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.iv blankISO800:1992(E) BSI 03-1999 1 1 Scope 1.1 General This International Standard specifies
16、requirements for the physical and chemical properties of phenolic moulding materials, classified by type and grade according to their use and properties. 1.2 Types Four types of phenolic moulding material are specified, as follows: Type A: General purpose Type C: Heat resistant Type D: Impact resist
17、ant Type E: Electrical applications 1.3 Filler The type of filler to be used in each type of phenolic moulding material is not specified but is usually as shown in the following examples: 1.4 Resin Abbreviations are used to indicate the type of phenolic resin, as follows: One-step phenolic resin: PF
18、1 Two-step phenolic resin: PF2 1.5 Grades The various types of material are further sub-divided into grades based on the property levels and requirements. EXAMPLE PF 2A1is a phenolic moulding material made from two-step resin, intended for general applications. The last digit indicates a particular
19、grade of one type of material. 1.6 Classification Table 1 shows the types and the grades of phenolic moulding material covered by this International Standard, together with their applications and distinguishing properties. Table 1 Classification of phenolic mouldingmaterials It shall not be inferred
20、 from the classification given inTable 1 that materials of any particular grade are necessarily unsuitable for applications other than those indicated, or that specific material will be suitable for all applications within the wide description given. 2 Normative references The following standards co
21、ntain provisions which, through reference in this text, constitute provisions of this International 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 investi
22、gate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO62:1980, Plastics Determination of water absorption. ISO75:1987, Plastics and ebonite Determination of temperature of d
23、eflection under load. Type of moulding material Filler A C D E Wood flour Mineral filler Cotton Mica Type and grade Applications and distinguishing properties PF 2A1 PF 2A2 PF 1A1 PF 1A2 PF 2C1 PF 2C2 PF 2C3 PF 2C4 PF 2C5 PF 2D1 PF 2D2 PF 2D3 PF 2D4 PF 2E1 General-purpose applications Similar to typ
24、e PF2A1but with improved electrical properties General-purpose applications, ammonia-free General-purpose applications, ammonia-free, with improved electrical properties Heat resistant Heat resistant, impact strength higher than that of type PF2C1 Heat resistant, similar to type PF2C1but with improv
25、ed electrical properties Heat resistant, asbestos-free Heat resistant, asbestos-free, with improved electrical properties Impact resistant Impact resistant (impact strength higher than that of type PF2D1) Impact resistant (impact strength higher than that of type PF2D2) Impact resistant (impact stre
26、ngth higher than that of type PF2D3) Electrical low loss applicationsISO800:1992(E) 2 BSI 03-1999 ISO120:1977, Plastics Phenol-formaldehyde mouldings Determination of free ammonia and ammonium compounds Colorimetric comparison method. ISO171:1980, Plastics Determination of bulk factor of moulding ma
27、terials. ISO178:1975, Plastics Determination of flexural properties of rigid plastics. ISO179:1982, Plastics Determination of Charpy impact strength of rigid materials. ISO180:1982, Plastics Determination of Izod impact strength of rigid materials. ISO181:1981, Plastics Determination of flammability
28、 characteristics of rigid plastics in the form of small specimens in contact with an incandescent rod. ISO291:1977, Plastics Standard atmospheres for conditioning and testing. ISO295:1991, Plastics Compression moulding of test specimens of thermosetting materials. ISO308:1981, Plastics Phenolic moul
29、ding materials Determination of acetone-soluble matter (apparent resin content of material in the unmoulded state). ISO1183:1987, Plastics Methods for determining the density and relative density of non-cellular plastics. ISO2577:1984, Plastics Thermosetting moulding materials Determination of shrin
30、kage. ISO2818:1980, Plastics Preparation of test specimens by machining. IEC112:1979, Method for determining the comparative and the proof tracking indices of solid insulating materials under moist conditions. IEC167:1964, Methods of test for the determination of the insulation resistance of solid i
31、nsulating materials. IEC243-1:1988, Methods of test for electric strength of solid insulating materials Part1: Tests at power frequencies. IEC250:1969, Recommended methods for the determination of the permittivity and dielectric dissipation factor of electrical insulating materials at power, audio a
32、nd radio frequencies including metre wave-length. IEC296:1982, Specification for unused mineral insulating oils for transformers and switchgear. 3 Definitions For the purposes of this International Standard, the following definitions apply. 3.1 phenolic moulding material thermosetting material based
33、 on a phenolic resin and used in the manufacture of thermoset-moulded articles. Other ingredients such as fillers, plasticizers, catalysts and colorants may be incorporated 3.2 phenolic resin generic term for a class of resins made by the polycondensation of phenol, and/or its homologues and/or deri
34、vatives of phenol or its homologues, with aldehydes or ketones. These thermosetting resins can be either novolaks (two-step PF2) or resols (one-step PF1) NOTE 1Novolak resins require a crosslinking agent, generally hexamethylenetetramine. 4 Requirements Phenolic moulding materials complying with thi
35、s specification shall meet the appropriate property requirements shown inTable 2. Though no specific limits are placed on the flow rate inTable 2, a suitable flow rate is essential for the satisfactory use of a phenolic moulding material and the flow rate shall therefore be specified in any contract
36、. The method of test and the flow rate value shall be as agreed by the interested parties. In addition, for some applications, it may be desirable for information to be made available on other properties of the moulding material, for example curing time, particle size or moisture content. If this is
37、 so, these properties and the method to be used shall be agreed by the interested parties. 5 Test specimens Bulk factor, moisture content, flow and particle size shall be measured on the moulding material itself. Other properties shall be determined on moulded test specimens prepared in accordance w
38、ith ISO295. It is permissible to machine test specimens from sheet (see ISO2818) moulded under the moulding conditions of ISO295, as long as it can be shown that the test specimens give results which do not differ significantly from those with moulded test specimens.ISO800:1992(E) BSI 03-1999 3 Test
39、 specimens to be used for determining the properties given in section B ofTable 2 shall be conditioned under prevailing atmospheric conditions as indicated in ISO291, unless otherwise stated in the method of the test or agreed by the interested parties. Tests shall comence not less than16h and not m
40、orethan72h after the test specimens have been moulded, unless otherwise specified in the methods. When test specimens have been moulded from powder which has been preheated or dried, then this fact shall be stated in the test report. The preheating or drying conditions shall also be given. 6 Methods
41、 of test 6.1 Determination of specific gravity See ISO1183, method A. Test specimens may be prepared from any moulded plate or bar. At least two test specimens shall be used for the determination. 6.2 Determination of flexural stress at rupture See ISO178. Five test specimens of length not lessthan8
42、0mm, of width 10mm and of thickness4mm shall be used. For both moulded bars and test specimens machined from material moulded in the form of a plate, the load shall be applied parallel to the direction of moulding pressure. The testing speed shall be2,0mm/min0,2mm/min. 6.3 Determination of Charpy im
43、pact strength See ISO179. For both moulded bars and test specimens machined from material moulded in the form of a plate, the load shall be applied parallel to the direction of moulding pressure. 6.3.1 Charpy notched impact strength See ISO179, method3C. Five test specimens shall be used for the det
44、ermination. 6.3.2 Charpy unnotched impact strength See ISO179, method3D. Five test specimens shall be used for the determination. 6.4 Determination of Izod impact strength See ISO180, method2A. Five test specimens shall be used for the determination. 6.5 Determination of temperature of deflection un
45、der load See ISO75, method A. Two test specimens of length not less than110mm, of width10mm and of thickness4mm shall be used. 6.6 Determination of flammability characteristics Use three test specimens, each measuring120mm10mm4mm, for the determination. The test shall be carried out in accordance wi
46、th ISO181, except for the following details: alter3min, remove the incandescent rod from the specimen and note whether there is any flame on the specimen during the next30s. 6.7 Determination of insulation resistance See IEC167. The test specimen shall be in the form of a flat plate moulded to a thi
47、ckness of3,0mm0,25mm. Taper pin electrodes shall be used. Before carrying out the test, the test specimens shall be conditioned (without electrodes) in an oven at50C2C for24h1h, and then cooled to room temperature in a desiccator. It shall then be immersed in distilled or deionized water maintained
48、at23C2C for24h1h. Before the specimen is tested, water on its surface shall be removed with blotting paper or filter paper or with a clean absorbent cloth, and the electrodes then fitted. Measurement of insulation resistance shall be made within5min of the end of the immersion. At least two test spe
49、cimens shall be used for the determination. 6.8 Determination of electric strength at power frequencies See IEC243-1. At least three test specimens shall be used for the determination. It may be necessary to measure the short-time value on an additional test specimen in order to determine the initial voltage to be applied. Each specimen shall be3,0mm0,25mm thick and not less than100mm in diameter. Each test specimen shall be immersed in oil at a temperature of90C2C for15min to20min before the test, and als
