ISO-719-1985.pdf
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1、International Standard lNTERNATlONAL ORGANIZATION FOR STANOAROIZATIONMEW.YHAPOIHAR OPrAHt43AUMR IlO CTAHilAPTH3AUHH*ORGANlSATlON INTERNATIONALE DE NORMALISATION A.PJ:;7 7r:;(2c2,1 a Giss - Hydrolytic resistance of glass grains at 98 OC - Method of test and classification Verre - R b) a classificatio
2、n of glass according to the hydrolytic resistance determined by the method of this International Standard. This International Standard is intended for use on the less resis- tant types of glass. For the more resistant glasses, the method specified in IS0 720 is preferable. NOTE - It is emphasized th
3、at there is no exact correlation between the classification laid down in this International Standard and that laid down in IS0 720, and it is therefore essential to identify which classification is being used. 2 References IS0 3851 I, Laboratory glassware - Burettes - Part I: General requirements. I
4、S0 38512, Laboratory glassware - Burettes - Parts: Burettes for which no waiting time is specified. IS0 585, Test sieves - Woven metal wire cloth, perforated plate and electroformed sheet - Nominal sizes of openings. IS0 848. Laboratory glassware - One-mark pipettes. IS0 720, Glass - Hydrolytic resi
5、stance of glass grains at 121 OC - Method of test and classification. IS0 1642, Laboratory glassware - One-mark volumetric flasks. IS0 1773, Laboratory glassware - Boiling flasks lnarrow- necked). IS0 3898, Water for laboratory use - Specifications.1) IS0 3819, Laboratory glassware - Beakers. ) 1) A
6、t present at the stage of draft. 3 Principle The method of test is a test for glass as a material applied on glass grains. Extraction of 2 g of grains, of particle size between 360 and 500 f.tm, with grade 2 water for 66 min at 98 OC. Measurement of the degree of the hydrolytic attack by analysis of
7、 the extraction solutions. 4 Reagents During the test, unless otherwise stated, use only reagents of recognized analytical grade. 4.1 Grade 2 water, which complies with the requirements specified in IS0 36% and which has been freed from dissolved gases, such as carbon dioxide, by boiling for at leas
8、t 15 min in a boiling flask (5.6). Such water can normally be stored for 24 h in a stoppered flask without change of the pH value. When tested immediately before use the water shall be neutral to methyl red, i.e. it shall produce an orange-red (not a violet- red or yellow) colour corresponding to pH
9、 5,5 + 0.1 when two drops of the methyl red indicator solution (4.4) are added to 25 ml of the water. NOTE - The water, so coloured, may also be used as a reference solu; tion (see clause 7). 4.2 Hydrochloric acid, standard volumetric solution, c(HCI) = 0,Ol mol/l. 4.3 Hydrochloric acid, solution, c
10、(HCI) = 1 mol/l. 4.4 Methyl red, indicator solution. Dissolve 25 mg of the sodium salt of methyl red fClsH14N3Na0.J in 106 ml of the grade 2 water (4.1). 4.5 Acetone (CH - a sieve B of 300 urn aperture; - a sieve 0 of a convenient aperture between 600 and 1 Ooo urn. The cover, pan and, especially, t
11、he rings shall be of stainless steel or lacquered wood. NOTE - The use of sieve 0 is recommended to retain larger pieces of glass and to avoid heavy wear on sieve A. 5.14 Ball-mill The mill shall be made of agate or stainless steel with a volume of 256 ml. Two balls with a diameter of 40 mm or three
12、 balls with a diameter of 30 mm are suitable. 5.15 Sieving-machine A mechanical sieve-shaker or sieving-machine may be used to sieve the grains. 5.16 Ultrasonic cleaner (laboratory type). 5.17 Drying oven, suitable for operation up to 150 OC. 5.18 Thermometer, covering the range from 96 to 110 OC, c
13、apable of being read to an accuracy of * 0.2 OC. 5.19 Heating bath, gas or electrically heated, ther- mostatically controlled, having capacity sufficient to contain at least 1 litre of liquid for each flask used in the test and capable of carrying out the heating cycle specified in clause 7. 1) Glas
14、s of hydrolytic resistance grain class IS0 719-HGB 1 adequately meets the requirements of class HGA 1 specified in IS0 720. 2 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 08:5
15、7:26 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 719-1985 (E) Approximate dimensions in millimetres / I 0 o 1 , . L $ f vl5 Figure - Mortar and pestle 8 Preparation of sample 6.1 Density of the glass 6.2 Crushing Check that the articles as received have been anneale
16、d to a commercially acceptable quality. NOTE - If an article is not annealed to a commercially acceptable quality, this fact should be noted because the results can be affected. Such articles, if very badly annealed, may also break very easily and extra care should be taken when handling them. Furth
17、er annealing should not be carried out before the test. Wrap the glass articles, which should, preferably, have a wall thickness greater than 1,5 mm, in clean paper and crush to pieces not more than 30 mm across. 6.3 Manual preparation Place 30 to 40 g of pieces (see 6.2) between 10 and 30 mm across
18、 in the mortar (5.111, insert the pestle (5.111, and strike it sharply, once only, with the hammer (5.10). NOTE - If more than one hammer blow is used in crushing the glass, the very fine particles produced may be compacted into aggregates which may or may not be subsequently broken down and which c
19、an therefore introduce further variables into the test. Transfer the glass from the mortar to the upper sieve 0 of the assembled set of sieves (5.131, and shake the set of sieves briefly to separate the finer particles. Return the glass remain- ing on sieves A and 0 to the mortar. Repeat crushing an
20、d siev- ing until only about 10 g of glass remain on sieve 0. Discard the glass from sieve 0 and from the receiving pan. Shake the set of sieves by hand for 5 min. Reserve for the test those grains which pass through sieve A, but which are retained on sieve B. At least 10 g of sample are required fo
21、r the test. If it is necessary to crush and sieve more sample, it is essential that the sample already obtained should be removed from sieve B and stored in a weighing bottle (5.8). After completion of all crushing and sieving, combine the samples, spread the grains on clean glazed paper and remove
22、any iron particles using the magnet (5.12). Transfer the grains into a beaker (5.7) for cleaning. 6.4 Mechanical preparation Transfer about 50 g of the coarsely broken glass (see 6.2) into the mill-beaker (5.141, add the bails and crush thin-walled glass (wall thickness 1,5 mm) for 5 min. Transfer t
23、he grains to the upper sieve 0 of the assembled set (5.13) of the sieving-machine (5.151, sieve for about 30 s and collect the grains retained on sieve B in the beaker (5.71, which shall be kept in the desiccator (5.9). Transfer the glass from sieves 0 and A back into the ball-mill and crush again f
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