1、Designation:D535595(Reapproved 2012)Standard Test Method forSpecific Gravity of Oils and Liquid Fats1This standard is issued under the fixed designation D5355;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.
2、A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()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 theweight of a unit
3、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 asstandard.No other units of measurement are included in thisstandard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is t
4、heresponsibility of the user of this standard 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 be
5、low 58C.2.1.3 oilssubstances that are 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 measu
6、re the specific gravityof all oils 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
7、and a capacity of approximately 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
8、then fill with recently boiled 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 wat
9、er and hold at the specified 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 weig
10、ht of the bottle plus 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 i
11、ts side in such 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 a
12、nd contents.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 tooverflow
13、ing,holding 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.1This test method is under the jurisdiction of ASTM Committee D31 on Leatherand is the direct responsibility of Subcommitt
14、ee D31.08 on Fats and OilsThis testmethod was developed in cooperation with the American Leather Chemists Assn.(Method H 15-1957).Current edition approved April 1,2012.Published April 2012.Originallyapproved in 1993.Last previous edition approved in 2006 as D5355 95(2006).DOI:10.1520/D5355-95R12.Cop
15、yright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.3.4 Carefully wipe off any oil that has come through thecapillary opening and remove from the bath.Clean and drythoroughly.5.3.5 Weigh the bottle and contents.Calculate the specificgravity as
16、 directed in 5.1.6.Calculation and Report6.1 Specific gravity at 25/25C=weight of bottle and oil2 weight of bottleweight of water at 257C(1)6.2 Specific gravity at 60/25C=FW110.000025335!#(2)where:F=weight of sample at 60C andW=weight of water at 25C.7.Keywords7.1 density;liquid fats;oil;specific gravityASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard.Users of this standard are expressly advised that
