1、INTERNATIONAL STANDARD IS0 1068-1975 (E)/ERRATUM Published 1980-l 1-I 5 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MXCWHAPOpHAR OPrAHM3ALWl 110 CTAHAPTM3AqAM.ORGANlSATlON INTERNATIONALE DE NORMALSATON Plastics - PVC resins - Determination of compacted apparent bulk density ERRATUM Outside front
2、cover : a) R,eplace the English title by : “Plastics - Homopolymer and copolymer resins of vinyl chloride - Determination of compacted apparent bulk density”. b) Replace the French sub-title by : “Plastiques - R these documents are now in the process of being transformed into International Standards
3、 As part of this process, Technical Committee ISO/TC 61 has reviewed IS0 Recommendation R 1068 and found it technically suitable for transformation. International Standard IS0 1068 therefore replaces IS0 Recommendation R 1068-1969 to which it is technically identical. IS0 Recommendation R 1068 was
4、approved by the Member Bodies of the following countries : Australia Austria Belgium Bulgaria Canada Czechoslovakia Egypt, Arab Rep. of France Germany Greece Hungary India Iran Israel Italy Japan Korea, Rep. of Netherlands New Zealand Poland Romania South Africa, Rep. of Spain Sweden Switzerland Tur
5、key United Kingdom U.S.A. Yugoslavia No Member Body expressed disapproval of the Recommendation. The Member Body of the following country disapproved the transformation of ISO/R 1068 into an International Standard : Canada 0 International Organization for Standardization, 1975. l Printed in Switzerl
6、and INTERNATIONAL STANDARD Plastics - PVC resins - Determination of compacted apparent bulk density 1 SCOPE AND FIELD OF APPLICATION This International Standard specifies a method for the determination of the compacted apparent bulk density of PVC resins. NOTE - The non-compacted apparent bulk densi
7、ty may be determined according to ISO/R 60, Determination of apparent density of moolding 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 comp
8、acted apparent bulk density from the mass of the resin and its volume after compaction. 3 APPARATUS 3.1 Shaking machine, giving 100 to 250 falls per minute from a height of 3 IL 0,2 mm, as shown in the figure. The cylinder holder shall have a mass of 450 * 20 g. 3.2 Precision graduated glass measuri
9、ng cylinder, 250 ml capacity, graduated in 2 ml and with a non-graduated portion of at least 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
10、 balance, enabling the cylinder to be weighed to the nearest 0,l g. 4 PROCEDURE Wash and dry the cylinder and weigh it to the nearest 0,l g. Introduce about 100 g of PVC resin, without shaking, and weigh the cylinder and resin to the nearest 0,l g, Calculate by difference the mass m of PVC resin use
11、d. Place the cylinder in the holder of the shaking machine and start the machine. After 1 250 2 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 neare
12、st 1 ml. Repeat the shaking for a further 1 250 + 50 cycles and determine the new volume. If the 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 + 5
13、0 cycles until the volumes measured after two successive shaking periods do not differ by more than 2 ml. Take the lower value, Vml, and stop the test. 5 EXPRESSION OF RESULTS The compacted apparent bulk density, in grams per millilitre, is calculated from the formula m v where m is the mass, in gra
14、ms, of the sample of PVC resin; V is the volume, in millilitres, of the compacted PVC resin. 6 TEST REPORT 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. ISO1068-1975(E) , q5 ext. about 40 mm II- _ ii Cint.about38mm FIGURE -Test apparatus
