1、Designation: C673 97 (Reapproved 2018)Standard Classification ofFireclay and High-Alumina Plastic Refractories andRamming Mixes1This standard is issued under the fixed designation C673; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revisio
2、n, the 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 classification covers fireclay and high-aluminaplastic refractories and ramming mixes that can be
3、pounded orrammed into place to form a monolithic structure. The terms“plastic” and “ramming mix” are generally intended to de-scribe the workability of the material. In this regard, plasticsare considered to be materials having a workability index ofmore than 15 % in accordance with Test Method C181
4、, whileramming mixes generally have less than 15 % workability bythe same procedure.1.2 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Gui
5、des and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2C24 Test Method for Pyrometric Cone Equivalent (PCE) ofFireclay and High-Alumina Refractory MaterialsC181 Test Method for Workability Index of Firecla
6、y andHigh-Alumina Refractory PlasticsNOTE 1Chemical analysis of refractory products is determined by acombination of X-ray fluorscence (XRF) and inductively coupled plasma(ICP) using standard reference materials (SRM), including various typesof minerals and refractory materials which are available f
7、rom the NationalInstitute of Standards and Technology and other appropriate sources.3. Significance and Use3.1 This classification defines a group of classes for use bythose producing or purchasing fireclay and high-alumina plas-tic refractories and ramming mixes. Each class is limited byPCE or alum
8、ina content, or both. This classification is fre-quently used as a specification when the properties shown inTable 1 are the only items specified.4. Classifications4.1 Fireclay plastic refractories and ramming mixes aredivided into two different classifications: (1) super duty, and(2) high duty.4.2
9、High-alumina plastic refractories and ramming mixesare divided into eight different classifications: (1)60%alumina, (2) 65 % alumina, (3) 70 % alumina, (4)80%alumina, (5) 85 % alumina, (6) 90 % alumina, (7)95%alumina, and (8) 100 % alumina.5. Basis of Classification5.1 The properties required for co
10、mpliance with a particularclassification are shown in Table 1.6. Test Methods6.1 The determination of aluminum oxide (Al2O3)onanignition-free basis, as required by this classification, as deter-mined by XRF and ICP.6.2 The determination of the pyrometric cone equivalent(PCE), as required by this cla
11、ssification, shall be in accordancewith Test Method C24.7. Retests7.1 Because of possible variables that may result fromsampling or an unsatisfactory reproducibility of tests bydifferent laboratories, the material may be resampled andretested at the request of either the purchaser or the manufac-tur
12、er. This could apply where the first test results may notconform to the requirements prescribed in this classification.Therefore, the final results to be used shall be the average of atleast two series of tests, each of which has been obtained byfollowing the specified testing procedures in detail.8
13、. Keywords8.1 classification; fireclay plastic refractories; fireclay ram-ming mixes; high-alumina plastic refractories; high-aluminaramming mixes; workability1This classification is under the jurisdiction of ASTM Committee C08 onRefractories and is the direct responsibility of Subcommittee C08.92 o
14、n The JosephE. Kopanda Subcommittee for Editorial, Terminology and Classification.Current edition approved Oct. 1, 2018. Published October 2018. Originallyapproved in 1971. Last previous edition approved in 2013 as C673 97 (2013).DOI: 10.1520/C0673-97R18.2For referenced ASTM standards, visit the AST
15、M 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 Conshohocken, PA 19428-2959. United
16、 StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers t
17、o Trade (TBT) Committee.1ASTM International takes no position respecting the validity of any patent 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 infring
18、ement of such rights, are 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
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22、600; http:/ 1 Classification of Fireclay and High-Alumina PlasticRefractories and Ramming MixesClass PCE, min Al2O3,%High duty 31 NRASuper duty 3212 NR60 % alumina 35 57.6 to 62.565 % alumina 3536 62.6 to 67.570 % alumina 36 67.6 to 72.580 % alumina 37 77.6 to 82.585 % alumina NR 82.6 to 87.590 % alumina NR 87.6 to 92.595 % alumina NR 92.6 to 97.5100 % alumina NR 97.5ANR = not required.C673 97 (2018)2
