1、Designation:E137990(Reapproved 2016)Standard Specification forLaboratory Glass Dewar Flask1This standard is issued under the fixed designation E1379;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number i
2、n parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification provides standard material and per-formance requirements for glass Dewar flasks suitable forgeneral laboratory use.1.2 The value
3、s stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.2.Referenced Documents2.1 ASTM Standards:2B85 Specification for Aluminum-Alloy Die CastingsE438 Specification for Glasses in Laboratory ApparatusE671 Specification for Maximum Permissible Th
4、ermal Re-sidual Stress in Annealed Glass Laboratory Apparatus3.Classification3.1 Glass Dewar flasks shall be of the following sizes:265mL,665 mL,1000 mL,1900 mL,4300 mLNOTE1The term millilitre(mL)is commonly used as a special namefor the cubic centimetre(cm3)and similarly the litre(L)for 1000 cubicc
5、entimetres,in accordance with the International System of Units(SI).4.Material and Annealing4.1 Flasks shall be made of borosilicate glass conforming tothe requirement of Type I,Class A,Specification E438.4.2 Maximum residual thermal stress shall conform toSpecification E671.4.3 Aluminum base alloy
6、metal shall conform to AlloyNumber A380 of Specification B85.5.Appearance5.1 The general appearance of the flasks shall conform toFig.1.6.Design6.1 Flasks shall be cylindrically shaped and have doublewalls silvered on the inside.The space between the walls shallbe evacuated to a vacuum level of 5 10
7、7Torr and sealed.Temperatures are to be held in excess of 500C duringevacuation.6.2 Flasks shall be firmly cemented into the base to protectthe sealing tip.6.3 Flasks shall have a protective plastic mesh,or shall becoated with a baked-on plastisol over exposed glass surface.7.Capacity and Dimensions
8、7.1 Standard Dewar flasks for government use shall con-form to the requirements of Table 1.7.2 Other Dewar flasks(not found in Table 1)are approvedfor use if they meet all of the design criteria found in Section6.8.Keywords8.1 dewar;flasks;glass1This specification is under the jurisdiction of ASTM C
9、ommittee E41 onLaboratory Apparatus and is the direct responsibility of Subcommittee E41.01 onLaboratory Ware and Supplies.Current edition approved Sept.1,2016.Published September 2016.Originallyapproved in 1990.Last previous edition approved in 2010 as E1379 90(2010).DOI:10.1520/E1379-90R16.2For re
10、ferenced ASTM standards,visit the ASTM website,www.astm.org,orcontact 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 Consh
11、ohocken,PA 19428-2959.United States1 FIG.1 Glass Dewar FlaskTABLE 1 Capacity and Dimensions for Glass Dewar FlasksNominalCapacity(mL)O.D.BodyNominal(mm)Overall HeightNominal(mm)I.D.BodyNominal(mm)Body DepthNominal(mm)265751526011366586241681951000863436830219001492671191954300177337152276E1379 90(20
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13、re 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
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15、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).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:/ 90(2016)3
