1、BRITISH STANDARD BS2782-6: Method621C: 1983 ISO171:1980 Methods of testing Plastics Part6: Dimensional properties Method621C: Determination of the bulk factor of moulding materials ISO title: Plastics Determination of bulk factor of moulding materials IMPORTANT NOTE. Before reading this method it is
2、 essential to read BS2782-0, Introduction, issued separately. UDC 678.5/.8:678.01:542.3:531.755:678.03BS2782-6:Method 621C:1983 This British Standard, having been prepared under the directionof the Plastics StandardsCommittee, was published under the authorityofthe BoardofBSIandcomes intoeffecton 31
3、January1983 BSI 11-1999 The following BSI references relate to the work on this standard: Committee reference PLC/17 Draft for comment 79/51314 DC ISBN 0 580 13145 9 Amendments issued since publication Amd. No. Date of issue CommentsBS2782-6:Method 621C:1983 BSI 11-1999 i Contents Page National fore
4、word ii 1 Scope and field of application 1 2 References 1 3 Definition 1 4 Test temperature 1 5 Procedure 1 6 Expression of results 1 7 Test report 1 Publications referred to Inside back coverBS2782-6:Method 621C:1983 ii BSI 11-1999 National foreword This method has been prepared under the direction
5、 of the Plastics Standards Committee, and is identical with ISO171:1980 “Plastics Determination of bulk factor of moulding materials”, published by the International Organization for Standardization(ISO). The method is technically similar to, and supersedes method501C of BS2782:1970, which is withdr
6、awn. Terminology and conventions. The text of the International Standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards; attention is especially drawn to the follow
7、ing. The symbol has been used throughout for density. In British Standards it is current practice to use the symbol for density. Wherever the words “International Standard” appear, referring to this standard, they should be read as “British Standard”. NOTEThe BSI Committee responsible for this stand
8、ard has confirmed that the technical requirements arising from the reference to ISO554:1976 are satisfied by the requirements of BS2782-0:1982 “Introduction” issued separately. Additional information. The test report, clause7, should include reference to the method used for the determination of appa
9、rent density. WARNING NOTE. This British Standard method does not necessarily 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
10、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 legal obligations. Cross references International
11、 Standard Corresponding British Standard ISO60:1977 BS2782 Methods of testing plastics Method621A:1978 Determination of apparent density of moulding material that can be poured from a funnel (Identical) ISO61:1976 Method621B:1978 Determination of apparent density of moulding material which cannot be
12、 poured from a funnel (Identical) ISO/R1183:1970 Part6 Methods620A to620D:1980 Method620A Determination of density of solid plastics excluding cellular plastics (immersion method) Method620B Determination of density of solid plastics excluding cellular plastics (pyknometer method) Method620C Determi
13、nation of density of solid plastics excluding cellular plastics (sink-float method) Method620D Determination of density of solid plastics excluding cellular plastics (density gradient column method) (Technically equivalent) Summary of pages This document comprises a front cover, an inside front cove
14、r, pagesi andii, pages1 and 2, 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.BS2782-6:Method 621C:1983 BSI 11-1999 1 1 Scope and field of app
15、lication This International Standard specifies a method of determining the bulk factor of a moulding material from its apparent density in the unmoulded form and its density in the moulded form. Knowledge of the bulk factor of a moulding material is of value as a basis for the calculation of minimum
16、 cavity volume in the design of moulds. 2 References ISO60, Plastics Determination of apparent density of material that can be poured from a specified funnel. ISO61, Plastics Determination of apparent density of moulding material that cannot be poured from a specified funnel. ISO554, Standard atmosp
17、heres for conditioning and/or testing Specifications. ISO/R1183, Plastics Methods for determining the density and relative density(specific gravity) of plastics excluding cellular plastics. 3 Definition bulk factor of a moulding material the ratio of the volume of a given mass of moulding material t
18、o its volume in the moulded form NOTEIt follows that it is also the ratio of the density of the material in its moulded form to its apparent density in the unmoulded form. 4 Test temperature The determinations of density and apparent density for calculation of the bulk factor shall be made at one of
19、 the test temperatures specified in ISO554. 5 Procedure 5.1 Determine the apparent density of the material in its unmoulded form in accordance with ISO60 or ISO61. 5.2 Determine the density of the material in its moulded form in accordance with ISO/R1183. 6 Expression of results The bulk factor is g
20、iven by the equation NOTEIn the calculation of bulk factor, the density of moulded material, in grams per millilitre, may be taken to be numerically equal to its specific gravity(relative density with water as the reference substance). 7 Test report The test report shall include the following partic
21、ulars: a) reference to this International Standard; b) complete identification of the material tested; c) the test temperature; d) the apparent density of the moulding material; e) the density of the material in its moulded form; f) the bulk factor. where is the bulk factor; m is the density of the
22、material in the moulded form, in grams per millilitre; u is the apparent density of the material in the unmoulded form, in grams per millilitre. m u - =2 blankBS2782-6:Method 621C:1983 BSI 11-1999 Publications referred to Seenational foreword.BS2782-6: Method621C: 1983 ISO171:1980 BSI 389 Chiswick H
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