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1、BRITISH STANDARD CONFIRMED JULY 1989 BS 2782-6: Method 621D: 1978 ISO 1068:1975 Methods of testing Plastics Part 6: Dimensional properties Method 621D: Determination of compacted apparent bulk density of PVC resins ISO title: Plastics PVC resins Determination of compacted apparent bulk density IMPOR
2、TANT NOTE. Before reading this method, it is essential to read the foreword, general introduction and instructions to BS 2782, issued separately. UDC 678.5/.8:678.01:542.3:531.755.22:678.743.24 Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 08:46:08 GMT+00:00 2
3、006, Uncontrolled Copy, (c) BSI BS 2782-6:Method 621D:1978 This British Standard, having been prepared under the direction of Plastics Standards Committee, was published under the authority of the Executive Board on 28 February 1978 BSI 11-1999 The following BSI references relate to the work on this
4、 standard: Committee reference PLC/17 Draft for comment 77/50307 DC ISBN 0 580 10029 4 National foreword This method is identical with ISO 1068 “Plastics PVC resins Determination of compacted apparent bulk density” which has been prepared by ISO/TC 61, Plastics. Terminology and conventions. The text
5、 of the International Standard has been approved as suitable for publication, without deviation, as a British Standard. Some terminology and certain conventions are not identical with those used in British Standards; attention is especially drawn to the following. The comma has been used throughout
6、as a decimal marker. In British Standards it is current practice to use a full point (on the baseline) as the decimal marker. Where the words “International Standard” appear, referring to this standard, they should be interpreted as “British Standard”. Cross-reference. For the following reference to
7、 an International Standard given in the text, there is a corresponding British Standard; this is given below: WARNING NOTE. This method, which is identical with ISO 1068, does not necessarily detail all the precautions necessary to meet the requirements of the Health and Safety at Work etc. Act 1974
8、. Attention should be paid to any necessary safety precautions, and the method should only be operated by trained 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
9、 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 and ii, pages 1 and 2 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorpora
10、ted. This will be indicated in the amendment table on the inside front cover. Reference to International Standard Corresponding British Standard ISO 60:1977aBS 2782:Method 621A:1978 Apparent density of moulding material that can be poured from a funnel (identical) a Since the publication of ISO 1068
11、, ISO/R 60 (referred to in clause 1) has been superseded by ISO 60 “Plastics Determination of apparent density of material that can be poured from a specified funnel”. Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: London South Bank University, London South Bank Uni
12、versity, Tue Dec 12 08:46:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2782-6:Method 621D:1978 BSI 11-1999i Contents Page National forewordInside front cover 1Scope and field of application1 2Principle1 3Apparatus1 4Procedure1 5Expression of results1 6Test report1 Figure Test apparatus2 Licensed
13、 Copy: London South Bank University, London South Bank University, Tue Dec 12 08:46:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 08:46:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2782-6:Method 621D:1
14、978 BSI 11-19991 1 Scope and field of application This International Standard specifies a method for the determination of the compacted apparent bulk density of PVC resins. NOTEThe non-compacted apparent bulk density may be determined according to ISO/R 60, Determination of apparent density of mould
15、ing material that can be poured from a specified funnel. 2 Principle Placing a known quantity of PVC resin in a precision graduated cylinder and submitting to shaking under given conditions. Calculation of the compacted apparent bulk density from the mass of the resin and its volume after compaction
16、. 3 Apparatus 3.1 Shaking machine, giving 100 to 250 falls per minute from a height of 3 0,2 mm, as shown in the Figure. The cylinder holder shall have a mass of 450 20 g. 3.2 Precision graduated glass measuring cylinder, 250 ml capacity, graduated in 2 ml and with a non-graduated portion of at leas
17、t 50 ml volume. Its internal diameter shall be about 38 mm and its mass 220 40 g (see the Figure). 3.3 Metallic piston, of diameter slightly smaller than the internal diameter of the cylinder. 3.4 Laboratory balance, enabling the cylinder to be weighed to the nearest 0,1 g. 4 Procedure Wash and dry
18、the cylinder and weigh it to the nearest 0,1 g. Introduce about 100 g of PVC resin, without shaking, and weigh the cylinder and resin to the nearest 0,1 g. Calculate by difference the mass m of PVC resin used. Place the cylinder in the holder of the shaking machine and start the machine. After 1 250
19、 50 cycles stop the machine and, if necessary, level the free surface of the resin with the metal piston by turning it without compacting the powder. Read off the volume occupied by the powder to the nearest 1 ml. Repeat the shaking for a further 1 250 50 cycles and determine the new volume. If the
20、difference between the two readings is less than or equal to 2 ml, take the lower value, V ml, and stop the test. If the difference is greater than 2 ml, continue shaking for further periods of 1 250 50 cycles until the volumes measured after two successive shaking periods do not differ by more than
21、 2 ml. Take the lower value, V ml, and stop the test. 5 Expression of results The compacted apparent bulk density, in grams per millilitre, is calculated from the formula where mis the mass, in grams, of the sample of PVC resin; Vis the volume, in millilitres, of the compacted PVC resin. 6 Test repo
22、rt The test report shall include the following particulars: a) the reference to this International Standard; b) the density in grams per millilitre; c) the date of the test. m V - - Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 08:46:08 GMT+00:00 2006, Uncontr
23、olled Copy, (c) BSI BS 2782-6:Method 621D:1978 2 BSI 11-1999 Figure Test apparatus Licensed Copy: London South Bank University, London South Bank University, Tue Dec 12 08:46:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank Licensed Copy: London South Bank University, London South Bank University
24、, Tue Dec 12 08:46:08 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 2782-6: Method 621D: 1978 ISO 1068:1975 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standard
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