1、Designation: E 1453 09Standard Guide forStorage of Magnetic Tape Media that Contains Analog orDigital Radioscopic Data1This standard is issued under the fixed designation E 1453; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the
2、year of last revision. 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 guide may be used for the control and maintenanceof recorded and unrecorded magnetic and optical media of
3、analog or digital electronic data from industrial radioscopy.1.2 The values stated in inch-pound units are to be regardedas standard. The SI units given in parentheses are for informa-tion only.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use.
4、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. For specificprecautionary statements, see Section 6.2. Referenced Documents2.1 ASTM Standards:2E 1000 Guide for Radiosco
5、pyE 1255 Practice for Radioscopy2.2 ANSI Standards:3INCITS 40 Unrecorded Magnetic TapeINCITS 39 Recorded Magnetic TapeINCITS 125 Two-Sided, Double Density DiskINCITS 46 Six-Disk PackINCITS 48 Magnetic Tape Cassettes2.3 NIST Standard:NBS Handbook, NBS SP 500.10143. Significance and Use3.1 The provisi
6、ons of this guide are intended to control andmaintain the quality of recorded industrial electronic data fromradioscopy and unrecorded magnetic and optical media only,and are not intended to control the acceptability of thematerials or products examined. It is further intended that thisguide be used
7、 as an adjunct to Guide E 1000 and PracticeE 1255.3.2 The necessity for applying specific control proceduressuch as those described in this guide is dependent to a certainextent, on the degree to which the user adheres to goodrecording and storage practices as a matter of routine proce-dure.4. Unrec
8、orded Media Storage4.1 Un-Opened Containers:4.1.1 Storage RecommendationsAny media in containerssealed by the manufacturer and not opened should be stored asshipped, whenever possible, to avoid container damage andpossible media damage. Storage temperature should be 60 620F (16 6 11C), relative humi
9、dity range of 45 6 15 %, at apressure range of 12.5 6 2.5 psi and a maximum magnetic fieldstrength of 50 Oe. The optimum storage conditions are 65F(18C) at 40 % relative humidity, 14.7 psi and a maximummagnetic field strength of 30 Oe. Damaging stresses in themedia can be produced by large temperatu
10、re and humidityvariations even if they remain within the specified ranges.Specific media manufacturers recommendations should beconsulted when large variations in temperature or humidity, orboth, are anticipated or experienced.4.1.2 Higher or Lower Storage ConditionsWhen tem-perature exceeds 90F (32
11、C) or humidity exceeds 90 %, orpressure exceeds 15 psi, some unrecorded media should beused under normal existing conditions to test for degradation.If degradation is found on these samples, subsequent samplingmay be done on other media to avoid unnecessary scrap. Ifstorage temperature falls below 3
12、0F (1C), media stored atthese lower temperatures in unopened containers should beallowed to stabilize at a room temperature (60 to 90F (16 to32C) before opening the containers. The stabilization timewill vary with the bulk of the stored media and the storagetemperature. The lower the temperature and
13、 greater the bulk,the longer the time required to reach room temperature. Ifcontainers are opened too soon, condensation could cause themedia to stick to whatever is touching their surfaces. If the1This guide is under the jurisdiction of ASTM Committee E07 on Nondestruc-tive Testing and is the direc
14、t responsibility of Subcommittee E07.11 on DigitalImaging and Communication in Nondestructive Evaluation (DICONDE).Current edition approved July 1, 2009. Published July 2009. Originally approvedin 1992. Last previous edition approved in 2002 as E 1453 - 93(2002).2For referenced ASTM standards, visit
15、 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.3Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York,
16、NY 10036, http:/www.ansi.org.4Available from National Institute of Standards and Technology (NIST), 100Bureau Dr., Stop 1070, Gaithersburg, MD 20899-1070, http:/www.nist.gov.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.relative hu
17、midity falls below 10 % and the moisture in themedia is reduced sufficiently, damage can occur during han-dling after opening the sealed containers, and the media may besubjected to static electrical discharges. Storage humiditiesover 60 % can also cause the media to stick to whatever istouching the
18、ir surfaces.4.2 Opened ContainersThe same considerations de-scribed in 4.1 for un-opened containers apply. Opened contain-ers are those on which the manufacturers inner bag around themedia has been opened. This can cause the unrecorded mediato stick/degrade more rapidly when exposed to high humidity
19、and temperature.5. Recorded Media Storage5.1 Recorded media are normally stored in some form ofenclosures to exclude dust/dirt and protect them against physi-cal deterioration and damage. Storage conditions can bedesigned for archival preservation, normally considered to befor at least 20 years or f
20、or moderate time periods by using theguidelines in 4.1; however, the recorded media must have beensufficiently recorded in accordance with manufacturers rec-ommendations and stored in suitable enclosures to ensurepreservation. The storage enclosure should limit dust particlesto 50 m maximum.5.1.1 En
21、closure Materials for Recorded Media:5.1.1.1 GeneralThe enclosure material shall be free ofacids and corrosives, and be chemically stable.5.1.1.2 Activity Test for Enclosure MaterialsAt least threerepresentative samples of recorded media to be stored togetherwith the proposed enclosures shall be pla
22、ced in close contactwith each other and subjected to an accelerated aging test of 856 5F (30 6 3C), 70 6 10 % relative humidity for 30 days.No materials should be transferred from the enclosure materialto the media and the recorded data should not be affected.5.2 Storage Area Conditions:5.2.1 Air Im
23、puritiesInert or inactive solid particles can bedeposited on recorded media and interfere with readability andproduce degradation. Reactive types of solids may causedegradation of the media and gaseous impurities may causedata deterioration. Never smoke, wax the floors, use steel woolpads on a buffe
24、r machine, eat or drink in the media storagearea. Solvents should not come into contact with the media,because they may soften the coatings and cause degradation.5.2.2 TemperatureContinuous temperatures above 120F(49C) may accelerate degradation and temperatures below thedew point of the air may pro
25、duce condensed moisture on therecorded data and cause sticking. In general, a moderatetemperature range, as described in 4.1, along with the minimi-zation of large variations, is recommended.5.2.3 HumidityThe extremes must be avoided as pro-longed exposures to relative humidities over 60 % will tend
26、 todamage the media and may cause fungus growth and sticking.Under conditions of low or changing humidity, defects in themedia may occur. Low humidities will also increase thepotential of static charges on the recorded media attractingsolids that could harm them. In general, a relative humidityrange
27、 of 30 to 60 % is recommended.5.3 Fire ResistanceRecorded media can withstand tem-peratures as high as 120F (49C) without significant loss ofdata quality, however, they may become distorted or stick toeach other or to the enclosure material.6. Special Precautions6.1 Damaging stresses in a tape pack
28、can be produced bylarge temperature and humidity variations even if they remainwithin the specified ranges. Excessive temperature and humid-ity conditions can also cause tape layer-to-layer adhesion(blocking) even if they are maintained constant. Extremely dryenvironment can cause layer-to-layer adh
29、esion due to staticbuild-up. Torn windings in the middle of a pack is a sure signthat the tape has been subjected to an extreme environment.The coatings on some storage media which have been sub-jected to very high humidities can breakdown and becomegummy due to hydrolysis. This media coating deteri
30、oration canusually be reversed by storing the media in a cool and dryenvironment for an extended period of time.6.2 Stray magnetic fields, which are of sufficient intensity toobliterate data on magnetic media, at a distance greater than 3in. (76 mm) from the source are rarely, if ever, encountered i
31、nnormal environments.6.3 Some media contain integral sensors that indicate tem-perature excursions exceeding manufacturers specifications.These indicators should be inspected before media use, thenperiodically during storage.6.4 Further guidance for the storage and care of specificproducts may be fo
32、und in ANSI standards, INCITS 40, IN-CITS 39, INCITS 125, INCITS 46, INCITS 48 and the NISTstandard, NBS SP 500.101.7. Precision and Bias7.1 No statement is made about the precision or bias of thisguide for measuring the amount of degradation of the media,since the results of the testing merely show
33、 whether the mediaare of sufficient quality to record and preserve radioscopic data.8. Keywords8.1 analog; data; digital; electronic; media; radioscopic;storageE1453092ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin t
34、his 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 any time by the responsible technical committee and must
35、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 comments will receive careful consideration at a meeting of there
36、sponsible 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 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).E1453093
