1、Designation: C 673 97 (Reapproved 2008)Standard Classification ofFireclay and High-Alumina Plastic Refractories andRamming Mixes1This standard is issued under the fixed designation C 673; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revis
2、ion, 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 b
3、e 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 C
4、181, whileramming mixes generally have less than 15 % workability bythe same procedure.2. Referenced Documents2.1 ASTM Standards:2C24 Test Method for Pyrometric Cone Equivalent (PCE) ofFireclay and High Alumina Refractory MaterialsC 181 Test Method for Workability Index of Fireclay andHigh-Alumina P
5、lastic RefractoriesNOTE 1Chemical analysis of refractory products are determined by acombination of x-ray fluorscence (XRF) and inductively coupled plazma(ICP) using standard reference materials (SRM); including various typesof minerals and refractory materials which are available from the NationalI
6、nstitute 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 alumina content, or
7、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 High-alumina pla
8、stic refractories and ramming mixesare divided into eight different classifications: (1) 60 % alu-mina, (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 compliance
9、 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 classificat
10、ion, shall be in accordancewith Test Method C24.7. Retests7.1 Because of possible variables that may result fromsampling or an unsatisfactory reproducibility of tests by dif-ferent laboratories, the material may be resampled and retestedat the request of either the purchaser or the manufacturer. Thi
11、scould apply where the first test results may not conform to therequirements prescribed in this classification. Therefore, thefinal results to be used shall be the average of at least two seriesof tests, each of which has been obtained by following thespecified testing procedures in detail.1This cla
12、ssification is under the jurisdiction of ASTM Committee C08 onRefractories and is the direct responsibility of Subcommittee C08.92 on The JosephE. Kopanda Subcommittee for Editorial, Terminology and Classification.Current edition approved Aug. 1, 2008. Published September 2008. Originallyapproved in
13、 1971. Last previous edition approved in 2003 as C 673 97 (2003).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 webs
14、ite.TABLE 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 35-36 62.6-67.570 % alumina 36 67.6 to 72.580 % alumina 37 77.6 to 82.585 % alumina NR 82.6 to 87.590 % alumin
15、a NR 87.6 to 92.595 % alumina NR 92.6 to 97.5100 % alumina NR 97.5ANR = not required.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.8. Keywords8.1 classification; fireclay plastic refractories; fireclay ram-ming mixes; high-alumina
16、plastic refractories; high-aluminaramming mixes; workabilityASTM 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 pa
17、tent 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 be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited ei
18、ther 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 theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair
19、 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).C 673 97 (2008)2
