1、Designation: D 5355 95 (Reapproved 2006)Standard Test Method forSpecific Gravity of Oils and Liquid Fats1This standard is issued under the fixed designation D 5355; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last r
2、evision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers the determination of the specificgravity of oils and liquid fats by calculating the ratio of thewei
3、ght of a unit volume of the sample to the weight of a unitvolume of water at 25C.1.2 The values stated in SI units are to be regarded as thestandard.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this s
4、tandard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Terminology2.1 Definitions:2.1.1 densityweight/unit volume expressed as grams percentimetre.2.1.2 liquid fatsfats that melt below 58C.2.1.3 oilssubstances that are
5、 fluid at 25C, consisting ofglycerides of fatty acids, aliphatic hydrocarbons, and aromatichydrocarbons.2.1.4 specific gravitythe ratio of the density of a substanceto the density of the reference substance.3. Significance and Use3.1 This test method is used to measure the specific gravityof all oil
6、s and liquid fats that are used to soften leather, or thatare used in products to soften leather. The specific gravity isone parameter that can be used to monitor the quality of theseproducts.4. Apparatus4.1 Specific Gravity Bottles, with well-fitting ground glassjoints and a capacity of approximate
7、ly 50 mL.4.2 Water Bath, maintained at 25 6 0.2C.4.3 Water Bath, maintained at 60 6 0.2C.4.4 Thermometer, laboratory thermometer having a rangefrom 20 to 102C with 0.1 or 0.2 subdivisions.5. Procedure5.1 Calibration of the Specific Gravity BottlesClean anddry thoroughly and then fill with recently b
8、oiled and cooleddistilled water at 20 to 23C. Fill the bottle to overflowing byholding the bottle on its side in such a manner as to prevent theentrapment of air bubbles. Insert the stopper and immerse in awater bath at 25 6 0.2C. Keep the entire bulb completelycovered with water and hold at the spe
9、cified temperature for 30min. Carefully remove any water that has exuded from the sideopening. Remove the bottle from the bath and wipe completelydry. Weigh the bottle and contents. Calculate the weight ofwater in the flask by subtracting the weight of the empty bottlefrom the weight of the bottle p
10、lus the water.5.2 Specific Gravity at 25/25C:5.2.1 Melt the sample and filter through filter paper toremove any impurities and the last traces of moisture. Thesample must be completely dry.5.2.2 Cool the sample from 20 to 23C and fill the bottle tooverflowing, holding the bottle on its side in such
11、a manner asto prevent the entrapment of air bubbles.5.2.3 Insert the stopper, immerse, and hold in the water bathat 25 6 0.2C for 30 min.5.2.4 Carefully wipe off any oil that has come through thecapillary opening and remove from the bath. Clean and drythoroughly.5.2.5 Weigh the bottle and contents.
12、Calculate the specificgravity as directed in 5.1.5.3 Specific Gravity at 60/25C:5.3.1 Melt the sample and filter through filter paper toremove any impurities and the last traces of moisture. Thesample must be completely dry.5.3.2 Pour the melted fat into the bottle at 56 to 58C tooverflowing, holdin
13、g the bottle on its side in such a manner asto prevent the entrapment of air bubbles.5.3.3 Insert the stopper, immerse, and hold in the water bathat 60 6 0.2C for 30 min.5.3.4 Carefully wipe off any oil that has come through thecapillary opening and remove from the bath. Clean and drythoroughly.1Thi
14、s test method is under the jurisdiction ofASTM Committee D31 on Leatherand is the direct responsibility of Subcommittee D31.08 on Fats and Oils.This testmethod was developed in cooperation with the American Leather Chemists Assn.(Method H 15-1957).Current edition approved April 1, 2006. Published Ap
15、ril 2006. Originallyapproved in 1993. Last previous edition approved in 2001 as D 5355 95(2001).1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5.3.5 Weigh the bottle and contents. Calculate the specificgravity as directed in 5.1.6.
16、Calculation and Report6.1 Specific gravity at 25/25C =weight of bottle and oil 2 weight of bottleweight of water at 25C(1)6.2 Specific gravity at 60/25C =FW1 1 0.000025 3 35!#(2)where:F = weight of sample at 60C andW = weight of water at 25C.7. Keywords7.1 density; liquid fats; oil; specific gravity
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18、 entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standar
19、dsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committ
20、ee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).D 5355 95 (2006)2
