1、Designation: C 673 97 (Reapproved 2003)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 (e) 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
3、be 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:C 24 Test Method for Pyrometric Cone Equivalent (PCE) ofFireclay and High-Alumina Refractory Materials2C 181 Test Method for Workability Index of Fireclay andHigh-Alumina
5、 Plastic Refractories2NOTE 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 Nation
6、alInstitute 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,
7、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 High-alumina
8、plastic 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 complia
9、nce 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 classifi
10、cation, shall be in accordancewith Test Method C 24.7. 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.
11、 Thiscould 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
12、 classification is under the jurisdiction of ASTM Committee C08 onRefractories and is the direct responsibility of Subcommittee C08.09 on MonolithicRefractories.Current edition approved April 10, 2003. Published June 2003. Originallyapproved in 1971. Last previous edition approved in 1997 as C 673 8
13、4 (1997).2Annual Book of ASTM Standards, Vol 15.01.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
14、 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.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.8. Keywords8.1 classification; fireclay plastic refra
15、ctories; fireclay ram-ming mixes; high-alumina 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 th
16、at 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 be reviewed every five years andif not revised, either reappr
17、oved 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 theresponsible technical committee, which you may attend. If you f
18、eel 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).C 673 97 (2003)2
