1、Designation: E 1379 90 (Reapproved 2005)Standard Specification forLaboratory Glass Dewar Flask1This standard is issued under the fixed designation E 1379; 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 (e) 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
3、2. Referenced Documents2.1 ASTM Standards:2B85 Specification for Aluminum-Alloy Die CastingsE 438 Specification for Glasses in Laboratory ApparatusE 671 Specification for Maximum Permissible Thermal Re-sidual Stress in Annealed Glass Laboratory Apparatus3. Classification3.1 Glass Dewar flasks shall
4、 be of the following sizes: 265mL, 665 mL, 1000 mL, 1900 mL, 4300 mLNOTE 1The term millilitre (mL) is commonly used as a special namefor the cubic centimetre (cm3) and similarly the litre (L) for 1000 cubiccentimetres, in accordance with the International System of Units (SI).4. Material and Anneali
5、ng4.1 Flasks shall be made of borosilicate glass conforming tothe requirement of Type I, Class A, Specification E 438.4.2 Maximum residual thermal stress shall conform toSpecification E 671.4.3 Aluminum base alloy metal shall conform to AlloyNumber A380 of Specification B85.5. Appearance5.1 The gene
6、ral 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 3 107Torr and sealed.Temperatures are to be held in excess of 500C duringevacuation.
7、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 Dimensions7.1 Standard Dewar flasks for government use shall con-form to the requirement
8、s 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 Committee E41 onLaboratory Apparatus and is the direct responsibility of S
9、ubcommittee E41.01 onApparatus.Current edition approved May 1, 2005. Published October 2005. Originallyapproved in 1990. Last previous edition approved in 1999 as E 137990(1999)e1.2Annual Book of ASTM Standards, Vol 02.02.For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact
10、 ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.TABLE 1 Capacity and Dimensions for Glass Dewar FlasksNominalCapacity(mL)O.D. BodyNominal(mm)Overall HeightNominal(mm)I.D. BodyNominal(mm)Bo
11、dy DepthNominal(mm)265 75 152 60 113665 86 241 68 1951000 86 343 68 3021900 149 267 119 1954300 177 337 152 2761Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.ASTM International takes no position respecting the validity of any patent
12、 rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised 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
13、 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 standardsand should be addressed to ASTM International Headquarters. Your comment
14、s 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 Committee on Standards, at the address shown below.This standard is copyrighted b
15、y 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).FIG. 1 Glass Dewar FlaskE 1379 90 (2005)2
