1、Designation:C14914Standard Test Method forThermal Shock Resistance of Glass Containers1This standard is issued under the fixed designation C149;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in par
2、entheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This test method covers the determination of the relativeresistance
3、 of commercial glass containers(bottles and jars)tothermal shock and is intended to apply to all types of glasscontainers that are required to withstand sudden temperaturechanges(thermal shock)in service such as in washing,pasteurization,or hot pack processes,or in being transferredfrom a warm to a
4、colder medium or vice versa.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 thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this s
5、tandard 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:2C224 Practice for Sampling Glass Containers2.2 ASTM Adjuncts:Apparatus for thermal shock test of glass containers(6Drawings)
6、33.Apparatus3.1 The apparatus shall consist essentially of a basket forholding the glassware upright,two tanks,one containing hotwater and one containing cold water,and an automaticallytimed means for immersing and transferring the basket ofbottles from the hot to the cold bath.A suitable type ofapp
7、aratus is illustrated in Fig.1.33.2 A device shall be provided to maintain the temperatureof the baths within 61.1C(2F)of the specified temperatures.Indicating controllers that control the heating of the hot waterand the cooling of the cold water are recommended.Otherwisedial thermometers should be
8、attached and the temperaturescontrolled manually.3.3 The capacity of each tank shall be at least 3.8 L(1 gal)for each 0.45 kg(1 lb)of glass tested.4.Sampling4.1 Methods of sampling a minimum lot from a group ofcontainers of a given type are given in Practice C224,for thevarious situations to which i
9、t may apply.5.Procedure5.1 Adjust the temperatures of the baths so that the coldbath is at 21C(70F)and the hot bath is at a temperaturehotter than the cold bath by a specified differential,preferably42C.As a result,the first immersion temperature will be 63C(145F,or a differential of approximately 7
10、5F)(Note 1).Fill,or partially fill,the basket,with empty bottles,and when thetemperatures of the baths are within 6 1.1C(2F)of thosespecified immerse the basket in the hot bath in such a mannerthat the bottles become completely filled with hot water,allowto soak for 5 min,transfer to the cold bath,a
11、nd immerse for 30s,and then remove from the cold bath.Control the 5-minimmersion in the hot bath within 10 s,and the time of transferfrom the hot to the cold bath shall be 15 6 1 s.During the test,protect the apparatus from drafts in a sheltered area.Observethe number of containers failing in the te
12、st by individualinspection of each.NOTE1If a cold bath temperature other than 21C(70F)is used,thespecified differential may be decreased(increased)by 0.5C(1F)for eachincrease(decrease)of 5.6C(10F)above(below)the recommended coldbath temperature.5.2 Use one of the following test procedures dependingu
13、pon the purpose of the test.5.2.1 Pass TestApply the test at a predetermined differen-tial.This pass test is sufficient for the routine testing of samplesfrom continuous production in a manufacturers plant.5.2.2 Progressive Test(to a Predetermined Percent ofBreakage)Where it may be desirable to cond
14、uct the test as a1This test method is under the jurisdiction of ASTM Committee C14 on Glassand Glass Products and is the direct responsibility of Subcommittee C14.07 onGlass Containers.Current edition approved May 1,2014.Published July 2014.Originally approvedin 1939.Last previous edition approved i
15、n 2010 as C149 86(2010).DOI:10.1520/C0149-14.2For referenced 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.3Detailed drawings ar
16、e available from ASTM International Headquarters.OrderAdjunct No.ADJC0149.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 measurement test,the test described in 5.1 may be repeated,thetemperature differential being increased,stepwise,by uniformincrements(usually 2.8 or 5.6C(5 or 10F)each step)byincreasing the temperature of the hot water bath,until thepredetermined percent of containers is broken.5.2.3 Progressive Test(Total)As an alt
