1、Designation:D555195(Reapproved 2012)Standard Test Method forDetermination of the Cloud Point of Oil1This standard is issued under the fixed designation D5551;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A
2、 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 cloudpoint of oils used in the softening and stuffing of leather and inthe manufacture of
3、 fat liquors and other softening and stuffingcompounds.This test method was derived from Test MethodsD97 and D2500.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.3 This standard does not purport to address all of thesafet
4、y concerns,if any,associated with its 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.2.Referenced Documents2.1 ASTM Standards:2D97 Test Method for Pour Point of Pet
5、roleum ProductsD2500 Test Method for Cloud Point of Petroleum ProductsE1 Specification for ASTM Liquid-in-Glass Thermometers3.Terminology3.1 cloud pointthat temperature,expressed as a multipleof 1C(2F),at which a cloud or haze of wax crystals appearsat the bottom of the test jar when the oil is cool
6、ed underprescribed conditions.4.Significance and Use4.1 This test method is intended to determine the cloudpoint of oils used in the softening and stuffing of leather,aswell as those used in the manufacture of products for suchpurpose.The cloud point of oils is measured for the purpose ofquality ass
7、urance.5.Apparatus5.1 Test Jar,clear cylindrical glass,flat bottom,30-to33.5-mm inside diameter,and 115-to 125-mm height.Toindicate sample height the jar should be marked with a line 546 3 mm above the inside bottom.5.2 Thermometers,having ranges shown below and con-forming to the requirements presc
8、ribed in Specification E1 forthermometers:ThermometerTemperatureNumberThermometerRangeASTMIPHigh cloud and pour38 to+50C5C1CLow cloud and pour80 to+20C6C2CMelting point+32 to+127C61C63C5.2.1 Since separation of liquid column thermometers occa-sionally occurs and may escape detection,thermometersshou
9、ld be checked immediately prior to the test and used onlyif they prove accurate within 6 1C(for example,ice point).5.3 Cork,to fit the test jar,bored centrally for the testthermometer.5.4 Jacket,metal or glass,watertight,cylindrical,flatbottom,115 mm in depth,42-to 50-mm inside diameter.Itmust be su
10、pported firmly in a vertical position in the coolingbath of 5.7 so that not more than 25 mm projects out of thecooling medium.5.5 Disk,cork or felt,6 mm thick,to fit loosely inside thejacket.5.6 Gasket,to fit snugly around the outside of the test jarand loosely inside the jacket.The gasket may be ma
11、de ofrubber,leather,or other material that is elastic enough to clingto the test jar and hard enough to hold its shape.Its purpose isto prevent the test jar from touching the jacket.5.7 Bath or Baths,maintained at prescribed temperatureswith a firm support to hold the jacket vertical.The requiredbat
12、h temperatures may be obtained by refrigeration ifavailable,otherwise by suitable freezing mixtures.Freezing1This test method is under the jurisdiction of ASTM Committee D31 on Leatherand is the direct responsibility of Subcommittee D31.08 on Fats and Oils.This testmethod was developed in cooperatio
13、n with the American Leather Chemists Assn.(Method H 18-1957).Current edition approved April 1,2012.Published April 2012.Originallyapproved in 1994.Last previous edition approved in 2006 as D5551 95(2006).DOI:10.1520/D5551-95R12.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcon
14、tact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 mixtures commonly used for t
15、emperatures down to thoseshown are as follows:For Tempera-tures DownIce and water9CCrushed ice and sodium chloride crystals12CCrushed ice and calcium chloride crystals27CAcetone or petroleum naphtha(see Section 6)chilled in acovered metal beaker with an ice-salt mixture to 12C thenwith enough solid
16、carbon dioxide to give the desired temper-ature.57CNOTE1There are automatic pour point testers available and in usethat may be advantageous in the saving of test time,permit the use ofsmaller samples,and have other factors that may merit their use.Ifautomatic testers are used,the user must ensure that all of the manufac-turers instructions for calibration,adjustment,and operation of theinstrument are followed.It must be reported that the pour point wasdetermined by an automatic instrument.Precis
