ASTM D5355-1995(2017) Standard Test Method for Specific Gravity of Oils and Liquid Fats《油和液体脂肪比重的标准试验方法》.pdf

1、Designation: D5355 95 (Reapproved 2017)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 rev

2、ision. 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

3、 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 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 i

4、ts use. It is theresponsibility 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.1.4 This international standard was developed in accor-dance with internationally recognized principles on standa

5、rd-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Terminology2.1 Definitions:2.1.1 densityweight/unit volume expressed as grams percentim

6、etre.2.1.2 liquid fatsfats that melt below 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 a

7、nd Use3.1 This test method is used to measure 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

8、 Bottles, with well-fitting ground glassjoints 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 S

9、pecific Gravity BottlesClean anddry thoroughly and 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

10、 0.2C. Keep the entire bulb completelycovered with water 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

11、by subtracting the weight of the empty bottlefrom the weight 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 23

12、C and fill the bottle tooverflowing, holding the bottle on its 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

13、from the bath. Clean and drythoroughly.5.2.5 Weigh the bottle and contents. Calculate the specificgravity as directed in 5.1.5.3 Specific Gravity at 60/25C:1This test method is under the jurisdiction of ASTM Committee D31 on Leatherand is the direct responsibility of Subcommittee D31.08 on Fats and

14、OilsThis testmethod was developed in cooperation with the American Leather Chemists Assn.(Method H 15-1957).Current edition approved April 1, 2017. Published April 2017. Originallyapproved in 1993. Last previous edition approved in 2012 as D5355 95(2012).DOI: 10.1520/D5355-95R17.Copyright ASTM Inter

15、national, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,

16、Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.15.3.1 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

17、56 to 58C tooverflowing, 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.5.3.4 Carefully wipe off any oil that has come through thecapillary opening and remove from the bat

18、h. Clean and drythoroughly.5.3.5 Weigh the bottle and contents. Calculate the specificgravity as directed in 5.1.6. 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 =FW110.000025 335!#(2)where:F =

19、 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 advi

20、sed that determination of the validity of any such patent rights, and the riskof infringement of such rights, are 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

21、reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand 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

22、 you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee 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. Individ

23、ual 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). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 95 (2017)2