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1、r J I S R*7112 78 m 4733608 0070282 3 m “JIS a a JAPANESE INDUSTRIAL STANDARD Method of Physical Test for Plaster of Paris Mold for Pottery Translated and Published bY Japanese Standards Association UDC 666.81 6:620.1 Printed in Japan 4 s I Copyright Japanese Standards Association Provided by IHS un
2、der license with JSALicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 07/30/2008 03:55:22 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S RkLL2 78 4933b08 0070283 5 W 7 In the event of any doubt arising, the original Standard in Japanese is to be fina
3、l authority. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 07/30/2008 03:55:22 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S R*112 78 m q33608 0070284 7 m UDC 666.816
4、:620.1 JAPANESE INDUSTRIAL STANDARD J I S Method of Physical Test for Plaster of R 9112-1978 Paris Mold for Pottery (Reaffirmed : 1986) 1. Scope This Japanese Industrial Standard specifies physical test for deciding the performance of plaster of Paris mold for pottery. 2. Sample 2.1 Sampling Method
5、For plaster of Paris mold, the sample shall be so taken as to express the average quality according to a rational sampling plan, However, in the case of testing non-aged plaster, it shall be that bleached in air for not less than 24 h after baking. 2.2 The sample for plaster of Paris mold shall be r
6、educed according to quatering, and stored in an airtight container free of moisture, 3. Methods of Test 3 . 1 Water-carrying Capacity The water-carrying capacity means the most suitable amount of water to be used for plaster. For deciding the water-carrying capacity, the following operation shall be
7、 carried out: Put 100 ml water at 15 to 25OC into a dried beaker of approximately 300 ml, next sink the sample into water while scattering it little by little into a beaker. When the excess supernatant water is extinguished completely, measure the mass of projected-in sample, obtain according to the
8、 following formula to one place of decimal, and count as one fractions of not more than 5 inclusive in one place of decimal and cut away the rest to decide the water-carrying capacity. 100 g (=mass of water used) mass of sample used ( g ) loo Water-carrying capacity (%) = Remark: Allow the time requ
9、ired for projection-in of plaster to be 2 min, and do not agitate around the inside during the time, nor move with shaking the beaker. Applicable Standard: JIS Z 8801-Test Sieves I Reference Standard: l a JIS Z 8203-S1 Units and the Use of their-Multiples and of Certain other Units Copyright Japanes
10、e Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 07/30/2008 03:55:22 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S R*iLL2 78 I gi33b08 0070285 i I 2 R 9112-1978 3.2 Starting Time of Flow
11、ing-in The starting time of flowing-in means the time since starting of projecting the plaster into water of water- carrying capacity until beginning of flowing-in. Namely, by using a suitable cylindrical container of approximately 150 mm in internal diameter, approximately 120 mm in height, pour wa
12、ter of water-carrying capacity into this, spread uniformly the specimen plaster 800 g on the water surface, after leaving for 2 min, stir by using a bar of 15 mm fn diameter at a speed of 100 times per min for approximately 2 min or more, and take the time, when even the trace of bar appears slightl
13、y it becomes such viscosity that immediately it extinguishes, as the starting time of flowing-in. 3.3 Setting Time The setting time means the time since starting of projecting-in of plaster into water of water carrying capacity until its setting. For its measurement, utilize a Vicker-needle-apparatu
14、s setting time measuring apparatus, pour in the paste having reached the starting time of flowing-in of 3.2 into metallic cylinder mold, insert a thermometer (l) into the middle and carry out the following test. (i) The starting time means the time until the standard needle of measuring apparatus ha
15、s come to stop at a height of 1 mm from the bottom of specimen. (2) The apparent endinding time means the time until the standard needle of measuring apparatus has come to stop at a depth of 1 mm from the surface of specimen. (3) The ending time means the time until the thermometer has come to indic
16、ate the highest temperature. The standard needle of Vicker-needle apparatus setting-time measuring * which head is cut flatly, and the total mass of matter to lower together with apparatus is a metallic needle of 45 mm in length, 2 mm in diameter of this is 300 k 1 g. Note ( l ) The thermometer to b
17、e used shall be an indicating graduation thermometer, of which reading is less than 0.5OC (value of one graduation) at 100C or lower (indicating amount). 3.4 Wet Tensile Strength For measuring wet tensile strength, use a tenstile strength tester of Michaelis type, place a metallic mold on a glass pl
18、ate, pour in the paste which has attained the starting time of flowing-in of 3.2, make the surface flat, smooth, after 40 min, remove the mold, leave in atmospheric air, and relating to that having elapsed 2 h since projection starting, measure the wet tensile strength. As to the measuring results,
19、obtain the average value of six pieces to the two places of decimals and count as one fractions of not less than 5 and cut away the rest in the second place of decimal. I Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Japan, IHS
20、 Not for Resale, 07/30/2008 03:55:22 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S R*9112 78 4933608 0070286 O W 3. R 9112-1978 3.5 Fineness For measuring the fineness, screen the plaster by using sieves of 420 um and 149 um of JIS Z 8801, and express the residual b
21、y percentage. However, for that carried out with the measurement not less than twice according to the following method, obtain the average value to one place of decimal and count as one fractions of not less than 5 and cut away the rest in one place of decimal to indicate. I, Take the sample of 50 g
22、 at each time, while striking lightly, give horizontal moving and up-and-down moving, treat the aggregated powder by rubbing lightly with fingertips to the degree to crush, carry out the screening, when the passing amount in 1 min has become not more than 0.1 g, weigh the mass remaining on the sieve
23、 and take it as the fineness residual. I Further, it may be carried out by using a machine sieve. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 07/30/2008 03:55:22 MDTNo reproduction or networking per
24、mitted without license from IHS -,-,- JIS R*112 78 W 4933b08 0070287 2 W R 9112-1978 Edition 1 Japanese Text Established by Minister of International Trade and Industry Date of Establishment: 1953-03-28 Date of Revision: 1978-08-01 Date of Reaffirmation: 1986-03-25 Date of Public Notice in Official
25、Gazette: 1986-03-26 Investigated by: Japanese Industrial Standards Committee Divisional Council on Ceramics Technical Committee on Plaster of Paris Mold for Pottery This English translation is published by: Japanese Standards Association 1-24, Akasaka 4, Minato-ku, Tokyo 107 Japan O JSA, 1991 Printed i n Tokyo by Hohbunsha Co., Ltd. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 07/30/2008 03:55:22 MDTNo reproduction or networking permitted without license from IHS -,-,-