1、Designation: C 502 09Standard Test Method forWedging of Flat, Rectangular Ceramic Wall and Floor Tile1This standard is issued under the fixed designation C 502; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revis
2、ion. 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 test method covers the determination of the wedg-ing or deviation from rectangularity of flat, rectangular walland floor ti
3、le. The test method covers tile as defined inTerminology C 242.1.2 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is t
4、heresponsibility 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.2. Referenced Documents2.1 ASTM Standards:2C 242 Terminology of Ceramic Whitewares and RelatedProductsC 499 Test Method for Faci
5、al Dimensions and Thickness ofFlat, Rectangular Ceramic Wall and Floor Tile3. Terminology3.1 Definitions:3.1.1 wedging of tilethe difference between two spacedmeasurements of the length or width of a tile, expressed as apercentage of the distance between points of measurements.3.2 For the definition
6、 of major and minor facial dimensionssee Test Method C 499.4. Significance and Use4.1 Tile are normally pressed in dies having true 90 angleconstruction. However, minor variations in die fill, compactingpressure, and heat treatment can result in finished tile withacute and obtuse angles. This out-of
7、-squareness results in adifference in length of opposite sides, and the tile may have theappearance of a keystone or wedge.4.2 Excessive wedging presents difficulties in the installa-tion of tile. This test method provides a means for determiningthe degree of wedging.5. Apparatus5.1 An apparatus as
8、shown in Fig. 1 or other suitableapparatus. The dial gage (B) is used for measuring rectangu-larity.5.2 A calibrating plate made of steel or aluminum ofaccurate dimensions and with straight, flat sides.6. Test Specimens6.1 At least ten tile specimens shall be selected at randomfrom the lot to be tes
9、ted. The specimens shall be brushed toremove all adhering particles of clay and sand.7. Procedure7.1 Select an apparatus of the appropriate dimensions sothat, when a tile is placed in the apparatus, the locating studsare 5 mm from each corner of the side adjacent to the sidebeing measured. The plung
10、er of the gage (B) shall also be 5mm from the corner of the tile on the side being measured.7.2 Fit the appropriate calibrating plate exactly into positionon the instrument and adjust the gauge reading to a suitableknown value.7.3 Remove the calibrating plate, place the proper surface ofthe tile on
11、the locating studs in the apparatus, and record thegage reading 5 mm from the corner. Rotate the tile, if square,to obtain four measurements. Repeat this procedure for eachtile. In the case of oblong tiles, use separate instruments of theappropriate dimensions to measure lengths and widths. Mea-sure
12、 to an accuracy of 0.1 mm.8. Calculation8.1 Calculate the percentage of wedging or deviation fromrectangularity as follows:dL3 100 5 % (1)1This method is under the jurisdiction of ASTM Committee C21 on CeramicWhitewares and Related Products and is the direct responsibility of SubcommitteeC21.06 on C
13、eramic Tile.Current edition approved Jan. 1, 2009. Published January 2009. Originallyapproved 1962. Last previous edition approved in 2004 as C 502 04.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStan
14、dards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.where:L = length of the adjacent side of the tile andd = deviation of the outer corner of the s
15、ide of the tile(measured 5 mm from the corner) from the inner sideof the calibrating plate.9. Report9.1 The report shall give the type and number of tile testedand shall show for each specimen:9.1.1 Average, maximum, and minimum percentage ofwedging of the major lengths,9.1.2 Average, maximum, and m
16、inimum percentage ofwedging of the major widths,9.1.3 Average, maximum, and minimum percentage ofwedging of the minor lengths, and9.1.4 Average, maximum, and minimum percentage ofwedging of the minor widths.NOTE 1For nominally square tile, 9.1.2 and 9.1.4 are not given and9.1.1 and 9.1.3 for such ti
17、le are calculated from the maximum differenceamong the four measurements.10. Precision and Bias10.1 Precision is being determined.10.2 Bias depends almost entirely on the accuracy of themeasuring devices and care taken to set up the equipment. Nointerlaboratory data are available with which to estim
18、ate a bias.11. Keywords11.1 flat, rectangular ceramic wall and floor tile; wedgingASTM 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 v
19、alidity 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 reapproved or withdrawn. Your c
20、omments 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 feel that your comments ha
21、ve 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).FIG. 1 Apparatus for Measurement of Straightness of Sides andRectangularityC502092
