BS 2782-6 Method 621D-1978 Methods of testing plastics - Dimensional properties - Determination of compacted apparent bulk density of PVC resins《塑料试验方法 第6部分 尺寸特性 聚氯乙烯树脂压实表观体积密度测定》.pdf

1、BRITISH STANDARD CONFIRMED JULY 1989 BS2782-6: Method621D: 1978 ISO1068:1975 Methods of testing Plastics Part6: Dimensional properties Method621D: Determination of compacted apparent bulk density of PVC resins ISO title: Plastics PVC resins Determination of compacted apparent bulk density IMPORTANT

2、NOTE. Before reading this method, it is essential to read the foreword, general introduction and instructions to BS2782, issued separately. UDC678.5/.8:678.01:542.3:531.755.22:678.743.24BS2782-6:Method621D:1978 This British Standard, having been prepared under the directionof Plastics Standards Comm

3、ittee, was published underthe authority of the Executive Board on 28February1978 BSI11-1999 The following BSI references relate to the work on this standard: Committee reference PLC/17 Draft for comment77/50307DC ISBN 0 580 10029 4 National foreword This method is identical with ISO1068 “Plastics PV

4、C resins Determination of compacted apparent bulk density” which has been prepared by ISO/TC61, Plastics. Terminology and conventions. The text of the International Standard hasbeen approved as suitable for publication, without deviation, as a BritishStandard. Some terminology and certain convention

5、s are not identical with those used in British Standards; attention is especially drawn to the following. The comma has been used throughout as a decimal marker. In BritishStandards it is current practice to use a full point (on the baseline) as the decimal marker. Where the words “International Sta

6、ndard” appear, referring to this standard, they should be interpreted as “British Standard”. Cross-reference. For the following reference to 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

7、 ISO1068, 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 necessary safety precautions, and the method should only be operated by trained personnel. A British Standard does not purport to

8、 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. Summary of pages This document comprises a front cover, an inside front cover,

9、pagesi andii, pages1 and 2 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. Reference to International Standard Corresponding British Standard ISO60:1977 a BS2782:M

10、ethod621A:1978 Apparent density of moulding material that can be poured from a funnel (identical) a Since the publication of ISO1068, ISO/R60 (referred to in clause1) has been superseded by ISO60 “Plastics Determination of apparent density of material that can be poured from a specified funnel”. Ame

11、ndments issued since publication Amd. No. Date of issue CommentsBS2782-6:Method621D:1978 BSI 11-1999 i Contents Page National foreword Inside front cover 1 Scope and field of application 1 2 Principle 1 3 Apparatus 1 4 Procedure 1 5 Expression of results 1 6 Test report 1 Figure Test apparatus 2ii b

12、lankBS2782-6:Method621D:1978 BSI 11-1999 1 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/R60, Determination of

13、apparent density of moulding 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 it

14、s volume after compaction. 3 Apparatus 3.1 Shaking machine, giving100 to250 falls per minute from a height of3 0,2mm, as shown in theFigure. The cylinder holder shall have a mass of450 20g. 3.2 Precision graduated glass measuring cylinder,250ml capacity, graduated in2ml and with a non-graduated port

15、ion of at least50ml volume. Its internal diameter shall be about38mm and its mass220 40g(seethe 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 nearest0,1g. 4 Procedure Wash and

16、dry the cylinder and weigh it to the nearest0,1g. Introduce about100g of PVC resin, without shaking, and weigh the cylinder and resin to the nearest0,1g. Calculate by difference the mass m of PVC resin used. Place the cylinder in the holder of the shaking machine and start the machine. After1250 50

17、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 nearest1ml. Repeat the shaking for a further1250 50 cycles and determine the new volume. If the differen

18、ce between the two readings is less than or equal to2ml, take the lower value, V ml, and stop the test. If the difference is greater than2ml, continue shaking for further periods of1250 50 cycles until the volumes measured after two successive shaking periods do not differ by more than2ml. Take the

19、lower value, V ml, and stop the test. 5 Expression of results The compacted apparent bulk density, in grams permillilitre, is calculated from the formula where m is the mass, in grams, of the sample of PVC resin; V is the volume, in millilitres, of the compacted PVC resin. 6 Test report The test rep

20、ort 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 -BS2782-6:Method621D:1978 2 BSI 11-1999 Figure Test apparatusblankBS2782-6: Method621D: 1978 ISO1068:1975 BSI 389 Chiswick High Road Lond

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